March 2025 - Linux-stable-mirror

[REGRESSION] stable-rc/linux-5.4.y: (build) expanded from macro '__pcpu_size_call_return' in arch/x86/events/a...

by KernelCI bot

Hello, New build issue found on stable-rc/linux-5.4.y: --- expanded from macro '__pcpu_size_call_return' in arch/x86/events/amd/core.o (arch/x86/events/amd/core.c) [logspec:kbuild,kbuild.compiler.note] --- - dashboard: https://d.kernelci.org/i/maestro:bcd59a7f893e94db607d602a4745b60a688799ff - giturl: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable-rc.git - commit HEAD: 135d26f7f8b786c6469b8a12bd7f77eb5d96584b Log excerpt: ===================================================== ./include/linux/percpu-defs.h:323:23In file included from arch/x86/events/amd/core.c:12: note: expanded from macro '__pcpu_size_call_return' 323 | case 4: pscr_ret__ = stem##4(variable); break; \ | ^ <scratch space>:87:1: note: expanded from here 87 | raw_cpu_read_4 | ^ ./arch/x86/include/asm/percpu.h:396:30: note: expanded from macro 'raw_cpu_read_4' 396 | #define raw_cpu_read_4(pcp) percpu_from_op(, "mov", pcp) | ^ ./arch/x86/include/asm/percpu.h:189:15: note: expanded from macro 'percpu_from_op' 189 | : "=q" (pfo: _rarch/x86/events/amd/../perf_event.he:t838_:_21): error: invalid output size for constraint '=q'\ | ^ ./include/linux/percpu-defs.h:446:2: note: expanded from macro '__this_cpu_read' 446 | raw_cpu_read(pcp); \ | ^ ./include/linux/percpu-defs.h:420:28: note: expanded from macro 'raw_cpu_read' 420 | #define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp) | ^ ./include/linux/percpu-defs.h:322:23: note: expanded from macro '__pcpu_size_call_return' 322 | case 2: pscr_ret__ = stem##2(variable); break; \ | ^ <scratch space>:46:1: note: expanded from here 46 | raw_cpu_read_2 | ^ ./arch/x86/include/asm/percpu.h:395:30: note: expanded from macro 'raw_cpu_read_2' 395 | #define raw_cpu_read_2(pcp) percpu_from_op(, "mov", pcp) | ^ ./arch/x86/include/asm/percpu.h:189:15: note: expanded from macro 'percpu_from_op' 189 | : "=q" (pfo_ret__) \ | ^ In file included from arch/x86/events/amd/core.c:12: arch/x86/events/amd/../perf_event.h:838:21: error: invalid output size for constraint '=q' ./include/linux/percpu-defs.h:446:2: note: expanded from macro '__this_cpu_read' 446 | raw_cpu_read(pcp); \ | ^ ./include/linux/percpu-defs.h:420:28: note: expanded from macro 'raw_cpu_read' 420 | #define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp) | ^ ./include/linux/percpu-defs.h:323:23: note: expanded from macro '__pcpu_size_call_return' 323 | case 4: pscr_ret__ = stem##4(variable); break; \ | ^ <scratch space>:55:1: note: expanded from here 55 | raw_cpu_read_4 | ^ ./arch/x86/include/asm/percpu.h:396:30: note: expanded from macro 'raw_cpu_read_4' 396 | #define raw_cpu_read_4(pcp) percpu_from_op(, "mov", pcp) | ^ ./arch/x86/include/asm/percpu.h:189:15: note: expanded from macro 'percpu_from_op' 189 | : "=q" (pfo_ret__) \ | ^ In file included from arch/x86/events/amd/core.c:12: arch/x86/events/amd/../perf_event.h:855:21: error: invalid output size for constraint '=q' 855 | u64 disable_mask = __this_cpu_read(cpu_hw_events.perf_ctr_virt_mask); | ^ ./include/linux/percpu-defs.h:446:2: note: expanded from macro '__this_cpu_read' 446 | raw_cpu_rea HDRTEST usr/include/sound/asound.h d(pcp); \ | ^ ./include/linux/percpu-defs.h:420:28: note: expanded from macro 'raw_cpu_read' 420 | #define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp) | ^ ./include/linux/percpu-defs.h:321:23: note: expanded from macro '__pcpu_size_call_return' 321 | case 1: pscr_ret__ = stem##1(variable); break; \ | ^ <scratch space>:67:1: note: expanded from here 67 | raw_cpu_read_1 | ^ ./arch/x86/include/asm/percpu.h:394:30: note: expanded from macro 'raw_cpu_read_1' 394 | #define raw_cpu_read_1(pcp) percpu_from_op(, "mov", pcp) | ^ ./arch/x86/include/asm/percpu.h:189:15: note: expanded from macro 'percpu_from_op' 189 | : "=q" (pfo_ret__) \ | ^ In file included from arch/x86/events/amd/core.c:12: arch/x86/events/amd/../perf_event.h:855:21: error: invalid output size for constraint '=q' ./include/linux/percpu-defs.h:446:2: note: expanded from macro '__this_cpu_read' 446 | raw_cpu_read(pcp); \ | ^ ./include/linux/percpu-defs.h:420:28: note: expanded from macro 'raw_cpu_read' 420 | #define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp) | ^ ./include/linux/percpu-defs.h:322:23: note: expanded from macro '__pcpu_size_call_return' 322 | case 2: pscr_ret__ = stem##2(variable); break; \ | ^ <scratch space>:76:1: note: expanded from here 76 | raw_cpu_read_2 | ^ ./arch/x86/include/asm/percpu.h:395:30: note: expanded from macro 'raw_cpu_read_2' 395 | #define raw_cpu_read_2(pcp) percpu_from_op(, "mov", pcp) | ^ ./arch/x86/include/asm/percpu.h:189:15: note: expanded from macro 'percpu_from_op' 189 | : "=q" (pfo_ret__) \ | ^ In file included from arch/x86/events/amd/core.c:12: arch/x86/events/amd/../perf_event.h:855:21: error: invalid output size for constraint '=q' ./include/linux/percpu-defs.h:446:2: note: expanded from macro '__this_cpu_read' 446 | raw_cpu_read(pcp); \ | ^ ./include/linux/percpu-defs.h:420:28: note: expanded from macro 'raw_cpu_read' 420 | #define raw_cpu_read(pcp) __pcpu_size_call_return(raw_cpu_read_, pcp) | ^ ./include/linux/percpu-defs.h:323:23: note: expanded from macro '__pcpu_size_call_return' 323 | case 4: pscr_ret__ = stem##4(variable); break; \ | ^ <scratch space>:85:1: note: expanded from here 85 | raw_cpu_read_4 | ^ ./arch/x86/include/asm/percpu.h:396:30: note: expanded from macro 'raw_cpu_read_4' 396 | #define raw_cpu_read_4(pcp) percpu_from_op(, "mov", pcp) | ^ ./arch/x86/include/asm/percpu.h:189:15: note: expanded from macro 'percpu_from_op' 189 | : "=q" (pfo_ret__) \ | ^ AS arch/x86/realmode/rm/header.o 6 errors generated. ===================================================== # Builds where the incident occurred: ## i386_defconfig+allmodconfig+CONFIG_FRAME_WARN=2048 on (i386): - compiler: clang-17 - dashboard: https://d.kernelci.org/build/maestro:67e2a3df67593f2aa03189b7 #kernelci issue maestro:bcd59a7f893e94db607d602a4745b60a688799ff Reported-by: kernelci.org bot <bot(a)kernelci.org> -- This is an experimental report format. Please send feedback in! Talk to us at kernelci(a)lists.linux.dev Made with love by the KernelCI team - https://kernelci.org

7 months, 2 weeks

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[PATCH AUTOSEL 5.4 1/2] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index bc06016a4fe90..d2fd12da30c60 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -288,8 +288,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx_ni(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -647,8 +647,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -669,8 +669,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index a5fc63c78370e..ea442ddd4fd9d 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -123,6 +123,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -132,35 +139,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -173,9 +178,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -217,9 +222,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

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[PATCH AUTOSEL 5.10 1/2] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index de47c16b134bf..3e77a52709aaa 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -288,8 +288,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx_ni(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -649,8 +649,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -671,8 +671,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index b15760b5c1cce..2be4a239f31e4 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -122,6 +122,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -131,35 +138,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -172,9 +177,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -216,9 +221,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

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[PATCH AUTOSEL 5.15 1/2] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index 4e728b3da40b3..edf01b73d2878 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -288,8 +288,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx_ni(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -649,8 +649,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -671,8 +671,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index b3099f0a3cb82..0533a3c4ff0e1 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -118,6 +118,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -127,35 +134,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -168,9 +173,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -214,9 +219,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

1
1
0 0

[PATCH AUTOSEL 6.1 1/3] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index 7d8543e877b44..bbd8e959137d9 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -287,8 +287,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -648,8 +648,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -670,8 +670,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index bbce97825f13f..25fdf060e30d0 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -118,6 +118,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -127,35 +134,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -168,9 +173,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -214,9 +219,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

1
2
0 0

[PATCH AUTOSEL 6.6 1/3] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index c469fc187f0c7..cdad0be43e8ff 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -287,8 +287,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -647,8 +647,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -669,8 +669,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index bbce97825f13f..25fdf060e30d0 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -118,6 +118,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -127,35 +134,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -168,9 +173,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -214,9 +219,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

1
2
0 0

[PATCH AUTOSEL 6.12 1/5] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index 01f3fbb3b67dc..65230e81fa08c 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -287,8 +287,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -647,8 +647,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -669,8 +669,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index bbce97825f13f..25fdf060e30d0 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -118,6 +118,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -127,35 +134,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -168,9 +173,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -214,9 +219,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

1
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0 0

[PATCH AUTOSEL 6.13 1/7] can: statistics: use atomic access in hot path

by Sasha Levin

From: Oliver Hartkopp <socketcan(a)hartkopp.net> [ Upstream commit 80b5f90158d1364cbd80ad82852a757fc0692bf2 ] In can_send() and can_receive() CAN messages and CAN filter matches are counted to be visible in the CAN procfs files. KCSAN detected a data race within can_send() when two CAN frames have been generated by a timer event writing to the same CAN netdevice at the same time. Use atomic operations to access the statistics in the hot path to fix the KCSAN complaint. Reported-by: syzbot+78ce4489b812515d5e4d(a)syzkaller.appspotmail.com Closes: https://lore.kernel.org/all/67cd717d.050a0220.e1a89.0006.GAE@google.com Signed-off-by: Oliver Hartkopp <socketcan(a)hartkopp.net> Reviewed-by: Vincent Mailhol <mailhol.vincent(a)wanadoo.fr> Link: https://patch.msgid.link/20250310143353.3242-1-socketcan@hartkopp.net Signed-off-by: Marc Kleine-Budde <mkl(a)pengutronix.de> Signed-off-by: Sasha Levin <sashal(a)kernel.org> --- net/can/af_can.c | 12 ++++++------ net/can/af_can.h | 12 ++++++------ net/can/proc.c | 46 +++++++++++++++++++++++++++------------------- 3 files changed, 39 insertions(+), 31 deletions(-) diff --git a/net/can/af_can.c b/net/can/af_can.c index 01f3fbb3b67dc..65230e81fa08c 100644 --- a/net/can/af_can.c +++ b/net/can/af_can.c @@ -287,8 +287,8 @@ int can_send(struct sk_buff *skb, int loop) netif_rx(newskb); /* update statistics */ - pkg_stats->tx_frames++; - pkg_stats->tx_frames_delta++; + atomic_long_inc(&pkg_stats->tx_frames); + atomic_long_inc(&pkg_stats->tx_frames_delta); return 0; @@ -647,8 +647,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) int matches; /* update statistics */ - pkg_stats->rx_frames++; - pkg_stats->rx_frames_delta++; + atomic_long_inc(&pkg_stats->rx_frames); + atomic_long_inc(&pkg_stats->rx_frames_delta); /* create non-zero unique skb identifier together with *skb */ while (!(can_skb_prv(skb)->skbcnt)) @@ -669,8 +669,8 @@ static void can_receive(struct sk_buff *skb, struct net_device *dev) consume_skb(skb); if (matches > 0) { - pkg_stats->matches++; - pkg_stats->matches_delta++; + atomic_long_inc(&pkg_stats->matches); + atomic_long_inc(&pkg_stats->matches_delta); } } diff --git a/net/can/af_can.h b/net/can/af_can.h index 7c2d9161e2245..22f3352c77fec 100644 --- a/net/can/af_can.h +++ b/net/can/af_can.h @@ -66,9 +66,9 @@ struct receiver { struct can_pkg_stats { unsigned long jiffies_init; - unsigned long rx_frames; - unsigned long tx_frames; - unsigned long matches; + atomic_long_t rx_frames; + atomic_long_t tx_frames; + atomic_long_t matches; unsigned long total_rx_rate; unsigned long total_tx_rate; @@ -82,9 +82,9 @@ struct can_pkg_stats { unsigned long max_tx_rate; unsigned long max_rx_match_ratio; - unsigned long rx_frames_delta; - unsigned long tx_frames_delta; - unsigned long matches_delta; + atomic_long_t rx_frames_delta; + atomic_long_t tx_frames_delta; + atomic_long_t matches_delta; }; /* persistent statistics */ diff --git a/net/can/proc.c b/net/can/proc.c index bbce97825f13f..25fdf060e30d0 100644 --- a/net/can/proc.c +++ b/net/can/proc.c @@ -118,6 +118,13 @@ void can_stat_update(struct timer_list *t) struct can_pkg_stats *pkg_stats = net->can.pkg_stats; unsigned long j = jiffies; /* snapshot */ + long rx_frames = atomic_long_read(&pkg_stats->rx_frames); + long tx_frames = atomic_long_read(&pkg_stats->tx_frames); + long matches = atomic_long_read(&pkg_stats->matches); + long rx_frames_delta = atomic_long_read(&pkg_stats->rx_frames_delta); + long tx_frames_delta = atomic_long_read(&pkg_stats->tx_frames_delta); + long matches_delta = atomic_long_read(&pkg_stats->matches_delta); + /* restart counting in timer context on user request */ if (user_reset) can_init_stats(net); @@ -127,35 +134,33 @@ void can_stat_update(struct timer_list *t) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->rx_frames > (ULONG_MAX / HZ)) + if (rx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* prevent overflow in calc_rate() */ - if (pkg_stats->tx_frames > (ULONG_MAX / HZ)) + if (tx_frames > (LONG_MAX / HZ)) can_init_stats(net); /* matches overflow - very improbable */ - if (pkg_stats->matches > (ULONG_MAX / 100)) + if (matches > (LONG_MAX / 100)) can_init_stats(net); /* calc total values */ - if (pkg_stats->rx_frames) - pkg_stats->total_rx_match_ratio = (pkg_stats->matches * 100) / - pkg_stats->rx_frames; + if (rx_frames) + pkg_stats->total_rx_match_ratio = (matches * 100) / rx_frames; pkg_stats->total_tx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->tx_frames); + tx_frames); pkg_stats->total_rx_rate = calc_rate(pkg_stats->jiffies_init, j, - pkg_stats->rx_frames); + rx_frames); /* calc current values */ - if (pkg_stats->rx_frames_delta) + if (rx_frames_delta) pkg_stats->current_rx_match_ratio = - (pkg_stats->matches_delta * 100) / - pkg_stats->rx_frames_delta; + (matches_delta * 100) / rx_frames_delta; - pkg_stats->current_tx_rate = calc_rate(0, HZ, pkg_stats->tx_frames_delta); - pkg_stats->current_rx_rate = calc_rate(0, HZ, pkg_stats->rx_frames_delta); + pkg_stats->current_tx_rate = calc_rate(0, HZ, tx_frames_delta); + pkg_stats->current_rx_rate = calc_rate(0, HZ, rx_frames_delta); /* check / update maximum values */ if (pkg_stats->max_tx_rate < pkg_stats->current_tx_rate) @@ -168,9 +173,9 @@ void can_stat_update(struct timer_list *t) pkg_stats->max_rx_match_ratio = pkg_stats->current_rx_match_ratio; /* clear values for 'current rate' calculation */ - pkg_stats->tx_frames_delta = 0; - pkg_stats->rx_frames_delta = 0; - pkg_stats->matches_delta = 0; + atomic_long_set(&pkg_stats->tx_frames_delta, 0); + atomic_long_set(&pkg_stats->rx_frames_delta, 0); + atomic_long_set(&pkg_stats->matches_delta, 0); /* restart timer (one second) */ mod_timer(&net->can.stattimer, round_jiffies(jiffies + HZ)); @@ -214,9 +219,12 @@ static int can_stats_proc_show(struct seq_file *m, void *v) struct can_rcv_lists_stats *rcv_lists_stats = net->can.rcv_lists_stats; seq_putc(m, '\n'); - seq_printf(m, " %8ld transmitted frames (TXF)\n", pkg_stats->tx_frames); - seq_printf(m, " %8ld received frames (RXF)\n", pkg_stats->rx_frames); - seq_printf(m, " %8ld matched frames (RXMF)\n", pkg_stats->matches); + seq_printf(m, " %8ld transmitted frames (TXF)\n", + atomic_long_read(&pkg_stats->tx_frames)); + seq_printf(m, " %8ld received frames (RXF)\n", + atomic_long_read(&pkg_stats->rx_frames)); + seq_printf(m, " %8ld matched frames (RXMF)\n", + atomic_long_read(&pkg_stats->matches)); seq_putc(m, '\n'); -- 2.39.5

7 months, 2 weeks

1
6
0 0

RE: Manufacturers and Engineers Accurate Contacts

by Debbie McCoy

Hello, I hope you are having a great day! I am writing this email to follow up on my previous email. I haven't received a response from you yet and I just wanted to make sure that you have received my email. When you have a moment, could you please let me know if you have received it or not? Please acknowledge the receipt of this email. Regards, Debbie ________________________________________________________________________________________ *Subject:* Manufacturers and Engineers Accurate Contacts Hello, Outdated or inaccurate contact data wastes valuable time. We provide highly accurate, *verified contact lists of Engineers, Manufacturers and Purchasing Managers Contacts*, ensuring you connect with the right people. Would you like to see a sample? If so, please let me know your *target geography* I’ll be happy to share details. Just a note that we can customize the lists to meet any specific requirements based on your criteria. Wishing you a wonderful day! Debbie McCoy Manager, Demand Generation If you ever feel like opting out, simply reply with "remove me" in the subject line

7 months, 2 weeks

1
0
0 0

[PATCH 1/4] drm/cirrus-qemu: Fix pitch programming

by Thomas Zimmermann

Do not set CR1B[6] when programming the pitch. The bit effects VGA text mode and is not interpreted by qemu. [1] It has no affect on the scanline pitch. The scanline bit that is set into CR1B[6] belongs into CR13[7], which the driver sets up correctly. This bug goes back to the driver's initial commit. Signed-off-by: Thomas Zimmermann <tzimmermann(a)suse.de> Link: https://gitlab.com/qemu-project/qemu/-/blob/stable-9.2/hw/display/cirrus_vg… # 1 Fixes: f9aa76a85248 ("drm/kms: driver for virtual cirrus under qemu") Cc: Adam Jackson <ajax(a)redhat.com> Cc: Dave Airlie <airlied(a)redhat.com> Cc: Maarten Lankhorst <maarten.lankhorst(a)linux.intel.com> Cc: Maxime Ripard <mripard(a)kernel.org> Cc: Thomas Zimmermann <tzimmermann(a)suse.de> Cc: <stable(a)vger.kernel.org> # v3.5+ --- drivers/gpu/drm/tiny/cirrus-qemu.c | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/gpu/drm/tiny/cirrus-qemu.c b/drivers/gpu/drm/tiny/cirrus-qemu.c index 52ec1e4ea9e5..a00d3b7ded6c 100644 --- a/drivers/gpu/drm/tiny/cirrus-qemu.c +++ b/drivers/gpu/drm/tiny/cirrus-qemu.c @@ -318,7 +318,6 @@ static void cirrus_pitch_set(struct cirrus_device *cirrus, unsigned int pitch) /* Enable extended blanking and pitch bits, and enable full memory */ cr1b = 0x22; cr1b |= (pitch >> 7) & 0x10; - cr1b |= (pitch >> 6) & 0x40; wreg_crt(cirrus, 0x1b, cr1b); cirrus_set_start_address(cirrus, 0); -- 2.48.1

7 months, 2 weeks

1
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