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[PATCH] powerpc/boot: Fix the initrd being overwritten under qemu

by Oliver O'Halloran

When booting under OF the zImage expects the initrd address and size to be passed to it using registers r3 and r4. SLOF (guest firmware used by QEMU) currently doesn't do this so the zImage is not aware of the initrd location. This can result in initrd corruption either though the zImage extracting the vmlinux over the initrd, or by the vmlinux overwriting the initrd when relocating itself. QEMU does put the linux,initrd-start and linux,initrd-end properties into the devicetree to vmlinux to find the initrd. We can work around the SLOF bug by also looking those properties in the zImage. Cc: stable(a)vger.kernel.org Cc: Alexey Kardashevskiy <aik(a)ozlabs.ru> Signed-off-by: Oliver O'Halloran <oohall(a)gmail.com> --- First noticed here: https://unix.stackexchange.com/questions/547023/linux-kernel-on-ppc64le-vml… --- arch/powerpc/boot/devtree.c | 21 +++++++++++++++++++++ arch/powerpc/boot/main.c | 7 +++++++ arch/powerpc/boot/of.h | 16 ---------------- arch/powerpc/boot/ops.h | 1 + arch/powerpc/boot/swab.h | 17 +++++++++++++++++ 5 files changed, 46 insertions(+), 16 deletions(-) diff --git a/arch/powerpc/boot/devtree.c b/arch/powerpc/boot/devtree.c index 5d91036..ac5c26b 100644 --- a/arch/powerpc/boot/devtree.c +++ b/arch/powerpc/boot/devtree.c @@ -13,6 +13,7 @@ #include "string.h" #include "stdio.h" #include "ops.h" +#include "swab.h" void dt_fixup_memory(u64 start, u64 size) { @@ -318,6 +319,26 @@ int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size) return dt_xlate(node, res, reglen, addr, size); } +int dt_read_addr(void *node, const char *prop, unsigned long *out_addr) +{ + int reglen; + + *out_addr = 0; + + reglen = getprop(node, prop, prop_buf, sizeof(prop_buf)) / 4; + if (reglen == 2) { + u64 v0 = be32_to_cpu(prop_buf[0]); + u64 v1 = be32_to_cpu(prop_buf[1]); + *out_addr = (v0 << 32) | v1; + } else if (reglen == 1) { + *out_addr = be32_to_cpu(prop_buf[0]); + } else { + return 0; + } + + return 1; +} + int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr) { diff --git a/arch/powerpc/boot/main.c b/arch/powerpc/boot/main.c index a9d2091..518af24 100644 --- a/arch/powerpc/boot/main.c +++ b/arch/powerpc/boot/main.c @@ -112,6 +112,13 @@ static struct addr_range prep_initrd(struct addr_range vmlinux, void *chosen, } else if (initrd_size > 0) { printf("Using loader supplied ramdisk at 0x%lx-0x%lx\n\r", initrd_addr, initrd_addr + initrd_size); + } else if (chosen) { + unsigned long initrd_end; + + dt_read_addr(chosen, "linux,initrd-start", &initrd_addr); + dt_read_addr(chosen, "linux,initrd-end", &initrd_end); + + initrd_size = initrd_end - initrd_addr; } /* If there's no initrd at all, we're done */ diff --git a/arch/powerpc/boot/of.h b/arch/powerpc/boot/of.h index 31b2f5d..dc24770 100644 --- a/arch/powerpc/boot/of.h +++ b/arch/powerpc/boot/of.h @@ -26,22 +26,6 @@ typedef u16 __be16; typedef u32 __be32; typedef u64 __be64; -#ifdef __LITTLE_ENDIAN__ -#define cpu_to_be16(x) swab16(x) -#define be16_to_cpu(x) swab16(x) -#define cpu_to_be32(x) swab32(x) -#define be32_to_cpu(x) swab32(x) -#define cpu_to_be64(x) swab64(x) -#define be64_to_cpu(x) swab64(x) -#else -#define cpu_to_be16(x) (x) -#define be16_to_cpu(x) (x) -#define cpu_to_be32(x) (x) -#define be32_to_cpu(x) (x) -#define cpu_to_be64(x) (x) -#define be64_to_cpu(x) (x) -#endif - #define PROM_ERROR (-1u) #endif /* _PPC_BOOT_OF_H_ */ diff --git a/arch/powerpc/boot/ops.h b/arch/powerpc/boot/ops.h index e060676..5100dd7 100644 --- a/arch/powerpc/boot/ops.h +++ b/arch/powerpc/boot/ops.h @@ -95,6 +95,7 @@ void *simple_alloc_init(char *base, unsigned long heap_size, extern void flush_cache(void *, unsigned long); int dt_xlate_reg(void *node, int res, unsigned long *addr, unsigned long *size); int dt_xlate_addr(void *node, u32 *buf, int buflen, unsigned long *xlated_addr); +int dt_read_addr(void *node, const char *prop, unsigned long *out); int dt_is_compatible(void *node, const char *compat); void dt_get_reg_format(void *node, u32 *naddr, u32 *nsize); int dt_get_virtual_reg(void *node, void **addr, int nres); diff --git a/arch/powerpc/boot/swab.h b/arch/powerpc/boot/swab.h index 11d2069..82db2c1 100644 --- a/arch/powerpc/boot/swab.h +++ b/arch/powerpc/boot/swab.h @@ -27,4 +27,21 @@ static inline u64 swab64(u64 x) (u64)((x & (u64)0x00ff000000000000ULL) >> 40) | (u64)((x & (u64)0xff00000000000000ULL) >> 56); } + +#ifdef __LITTLE_ENDIAN__ +#define cpu_to_be16(x) swab16(x) +#define be16_to_cpu(x) swab16(x) +#define cpu_to_be32(x) swab32(x) +#define be32_to_cpu(x) swab32(x) +#define cpu_to_be64(x) swab64(x) +#define be64_to_cpu(x) swab64(x) +#else +#define cpu_to_be16(x) (x) +#define be16_to_cpu(x) (x) +#define cpu_to_be32(x) (x) +#define be32_to_cpu(x) (x) +#define cpu_to_be64(x) (x) +#define be64_to_cpu(x) (x) +#endif + #endif /* _PPC_BOOT_SWAB_H_ */ -- 2.9.5

5 years, 8 months

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[PATCH v2 1/3] ACPI / LPSS: Add LNXVIDEO -> BYT I2C7 to lpss_device_links

by Hans de Goede

So far on Bay Trail (BYT) we only have been adding a device_link adding the iGPU (LNXVIDEO) device as consumer for the I2C controller for the PMIC for I2C5, but the PMIC only uses I2C5 on BYT CR (cost reduced) on regular BYT platforms I2C7 is used and we were not adding the device_link sometimes causing resume ordering issues. This commit adds LNXVIDEO -> BYT I2C7 to the lpss_device_links table, fixing this. Cc: stable(a)vger.kernel.org Fixes: e6ce0ce34f65 ("ACPI / LPSS: Add device link for CHT SD card ... on I2C") Signed-off-by: Hans de Goede <hdegoede(a)redhat.com> --- Changes in v2: -Add Fixes: tag --- drivers/acpi/acpi_lpss.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/drivers/acpi/acpi_lpss.c b/drivers/acpi/acpi_lpss.c index 60bbc5090abe..e7a4504f0fbf 100644 --- a/drivers/acpi/acpi_lpss.c +++ b/drivers/acpi/acpi_lpss.c @@ -473,9 +473,14 @@ struct lpss_device_links { * the supplier is not enumerated until after the consumer is probed. */ static const struct lpss_device_links lpss_device_links[] = { + /* CHT External sdcard slot controller depends on PMIC I2C ctrl */ {"808622C1", "7", "80860F14", "3", DL_FLAG_PM_RUNTIME}, + /* CHT iGPU depends on PMIC I2C controller */ {"808622C1", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, + /* BYT CR iGPU depends on PMIC I2C controller (UID 5 on CR) */ {"80860F41", "5", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, + /* BYT iGPU depends on PMIC I2C controller (UID 7 on non CR) */ + {"80860F41", "7", "LNXVIDEO", NULL, DL_FLAG_PM_RUNTIME}, }; static bool hid_uid_match(struct acpi_device *adev, -- 2.23.0

5 years, 8 months

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[PATCH v2] cgroup: pids: use atomic64_t for pids->limit

by Aleksa Sarai

Because pids->limit can be changed concurrently (but we don't want to take a lock because it would be needlessly expensive), use atomic64_ts instead. Fixes: commit 49b786ea146f ("cgroup: implement the PIDs subsystem") Cc: stable(a)vger.kernel.org # v4.3+ Signed-off-by: Aleksa Sarai <cyphar(a)cyphar.com> --- v2: * Switch to atomic64_t instead of using {READ,WRITE}_ONCE(). v1: <https://lore.kernel.org/lkml/20191012010539.6131-1-cyphar@cyphar.com/> kernel/cgroup/pids.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/kernel/cgroup/pids.c b/kernel/cgroup/pids.c index 8e513a573fe9..138059eb730d 100644 --- a/kernel/cgroup/pids.c +++ b/kernel/cgroup/pids.c @@ -45,7 +45,7 @@ struct pids_cgroup { * %PIDS_MAX = (%PID_MAX_LIMIT + 1). */ atomic64_t counter; - int64_t limit; + atomic64_t limit; /* Handle for "pids.events" */ struct cgroup_file events_file; @@ -73,8 +73,8 @@ pids_css_alloc(struct cgroup_subsys_state *parent) if (!pids) return ERR_PTR(-ENOMEM); - pids->limit = PIDS_MAX; atomic64_set(&pids->counter, 0); + atomic64_set(&pids->limit, PIDS_MAX); atomic64_set(&pids->events_limit, 0); return &pids->css; } @@ -146,13 +146,14 @@ static int pids_try_charge(struct pids_cgroup *pids, int num) for (p = pids; parent_pids(p); p = parent_pids(p)) { int64_t new = atomic64_add_return(num, &p->counter); + int64_t limit = atomic64_read(&p->limit); /* * Since new is capped to the maximum number of pid_t, if * p->limit is %PIDS_MAX then we know that this test will never * fail. */ - if (new > p->limit) + if (new > limit) goto revert; } @@ -277,7 +278,7 @@ static ssize_t pids_max_write(struct kernfs_open_file *of, char *buf, * Limit updates don't need to be mutex'd, since it isn't * critical that any racing fork()s follow the new limit. */ - pids->limit = limit; + atomic64_set(&pids->limit, limit); return nbytes; } @@ -285,7 +286,7 @@ static int pids_max_show(struct seq_file *sf, void *v) { struct cgroup_subsys_state *css = seq_css(sf); struct pids_cgroup *pids = css_pids(css); - int64_t limit = pids->limit; + int64_t limit = atomic64_read(&pids->limit); if (limit >= PIDS_MAX) seq_printf(sf, "%s\n", PIDS_MAX_STR); -- 2.23.0

5 years, 8 months

2
1
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[PATCH] spi: Fix SPI_CS_HIGH setting when using native and GPIO CS

by Gregory CLEMENT

When improving the CS GPIO support at core level, the SPI_CS_HIGH has been enabled for all the CS lines used for a given SPI controller. However, the SPI framework allows to have on the same controller native CS and GPIO CS. The native CS may not support the SPI_CS_HIGH, so they should not be setup automatically. With this patch the setting is done only for the CS that will use a GPIO as CS Fixes: f3186dd87669 ("spi: Optionally use GPIO descriptors for CS GPIOs") Cc: <stable(a)vger.kernel.org> Signed-off-by: Gregory CLEMENT <gregory.clement(a)bootlin.com> --- drivers/spi/spi.c | 18 +++++++++--------- 1 file changed, 9 insertions(+), 9 deletions(-) diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c index 5414a10afd65..1b68acc28c8f 100644 --- a/drivers/spi/spi.c +++ b/drivers/spi/spi.c @@ -1880,15 +1880,7 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, spi->mode |= SPI_3WIRE; if (of_property_read_bool(nc, "spi-lsb-first")) spi->mode |= SPI_LSB_FIRST; - - /* - * For descriptors associated with the device, polarity inversion is - * handled in the gpiolib, so all chip selects are "active high" in - * the logical sense, the gpiolib will invert the line if need be. - */ - if (ctlr->use_gpio_descriptors) - spi->mode |= SPI_CS_HIGH; - else if (of_property_read_bool(nc, "spi-cs-high")) + if (of_property_read_bool(nc, "spi-cs-high")) spi->mode |= SPI_CS_HIGH; /* Device DUAL/QUAD mode */ @@ -1952,6 +1944,14 @@ static int of_spi_parse_dt(struct spi_controller *ctlr, struct spi_device *spi, } spi->chip_select = value; + /* + * For descriptors associated with the device, polarity inversion is + * handled in the gpiolib, so all gpio chip selects are "active high" + * in the logical sense, the gpiolib will invert the line if need be. + */ + if ((ctlr->use_gpio_descriptors) && ctlr->cs_gpiods[spi->chip_select]) + spi->mode |= SPI_CS_HIGH; + /* Device speed */ rc = of_property_read_u32(nc, "spi-max-frequency", &value); if (rc) { -- 2.23.0

5 years, 8 months

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[PATCH 04/22] ext4: Fix credit estimate for final inode freeing

by Jan Kara

Estimate for the number of credits needed for final freeing of inode in ext4_evict_inode() was to small. We may modify 4 blocks (inode & sb for orphan deletion, bitmap & group descriptor for inode freeing) and not just 3. Fixes: e50e5129f384 ("ext4: xattr-in-inode support") CC: stable(a)vger.kernel.org Signed-off-by: Jan Kara <jack(a)suse.cz> --- fs/ext4/inode.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 516faa280ced..e6b631d50c26 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -196,7 +196,12 @@ void ext4_evict_inode(struct inode *inode) { handle_t *handle; int err; - int extra_credits = 3; + /* + * Credits for final inode cleanup and freeing: + * sb + inode (ext4_orphan_del()), block bitmap, group descriptor + * (xattr block freeind), bitmap, group descriptor (inode freeing) + */ + int extra_credits = 6; struct ext4_xattr_inode_array *ea_inode_array = NULL; trace_ext4_evict_inode(inode); -- 2.16.4

5 years, 8 months

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[PATCH 7u 15/15] NFS: only invalidate dentrys that are clearly invalid.

by luanshi

From: NeilBrown <neilb(a)suse.com> commit cc89684c9a265828ce061037f1f79f4a68ccd3f7 upstream Since commit bafc9b754f75 ("vfs: More precise tests in d_invalidate") in v3.18, a return of '0' from ->d_revalidate() will cause the dentry to be invalidated even if it has filesystems mounted on or it or on a descendant. The mounted filesystem is unmounted. This means we need to be careful not to return 0 unless the directory referred to truly is invalid. So -ESTALE or -ENOENT should invalidate the directory. Other errors such a -EPERM or -ERESTARTSYS should be returned from ->d_revalidate() so they are propagated to the caller. A particular problem can be demonstrated by: 1/ mount an NFS filesystem using NFSv3 on /mnt 2/ mount any other filesystem on /mnt/foo 3/ ls /mnt/foo 4/ turn off network, or otherwise make the server unable to respond 5/ ls /mnt/foo & 6/ cat /proc/$!/stack # note that nfs_lookup_revalidate is in the call stack 7/ kill -9 $! # this results in -ERESTARTSYS being returned 8/ observe that /mnt/foo has been unmounted. This patch changes nfs_lookup_revalidate() to only treat -ESTALE from nfs_lookup_verify_inode() and -ESTALE or -ENOENT from ->lookup() as indicating an invalid inode. Other errors are returned. Also nfs_check_inode_attributes() is changed to return -ESTALE rather than -EIO. This is consistent with the error returned in similar circumstances from nfs_update_inode(). As this bug allows any user to unmount a filesystem mounted on an NFS filesystem, this fix is suitable for stable kernels. Fixes: bafc9b754f75 ("vfs: More precise tests in d_invalidate") Cc: stable(a)vger.kernel.org (v3.18+) Signed-off-by: NeilBrown <neilb(a)suse.com> Signed-off-by: Anna Schumaker <Anna.Schumaker(a)Netapp.com> Signed-off-by: luanshi <zhangliguang(a)linux.alibaba.com> --- 7u/fs/nfs/dir.c | 12 ++++++++---- 7u/fs/nfs/inode.c | 4 ++-- 2 files changed, 10 insertions(+), 6 deletions(-) diff --git a/7u/fs/nfs/dir.c b/7u/fs/nfs/dir.c index 4532d58..dae382a 100644 --- a/7u/fs/nfs/dir.c +++ b/7u/fs/nfs/dir.c @@ -1239,11 +1239,13 @@ static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) /* Force a full look up iff the parent directory has changed */ if (!nfs_is_exclusive_create(dir, flags) && nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { - - if (nfs_lookup_verify_inode(inode, flags)) { + error = nfs_lookup_verify_inode(inode, flags); + if (error) { if (flags & LOOKUP_RCU) return -ECHILD; - goto out_zap_parent; + if (error == -ESTALE) + goto out_zap_parent; + goto out_error; } goto out_valid; } @@ -1267,8 +1269,10 @@ static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) trace_nfs_lookup_revalidate_enter(dir, dentry, flags); error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr, label); trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); - if (error) + if (error == -ESTALE || error == -ENOENT) goto out_bad; + if (error) + goto out_error; if (nfs_compare_fh(NFS_FH(inode), fhandle)) goto out_bad; if ((error = nfs_refresh_inode(inode, fattr)) != 0) diff --git a/7u/fs/nfs/inode.c b/7u/fs/nfs/inode.c index 010d0b9..b3a4a25 100644 --- a/7u/fs/nfs/inode.c +++ b/7u/fs/nfs/inode.c @@ -1214,9 +1214,9 @@ static int nfs_check_inode_attributes(struct inode *inode, struct nfs_fattr *fat return 0; /* Has the inode gone and changed behind our back? */ if ((fattr->valid & NFS_ATTR_FATTR_FILEID) && nfsi->fileid != fattr->fileid) - return -EIO; + return -ESTALE; if ((fattr->valid & NFS_ATTR_FATTR_TYPE) && (inode->i_mode & S_IFMT) != (fattr->mode & S_IFMT)) - return -EIO; + return -ESTALE; if ((fattr->valid & NFS_ATTR_FATTR_CHANGE) != 0 && inode->i_version != fattr->change_attr) -- 1.8.3.1

5 years, 8 months

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[PATCH 7u 02/15] resizable namespace.c hashes

by luanshi

From: Al Viro <viro(a)zeniv.linux.org.uk> commit 0818bf27c05b2de56c5b2bd08cfae2a939bd5f52 upstream * switch allocation to alloc_large_system_hash() * make sizes overridable by boot parameters (mhash_entries=, mphash_entries=) * switch mountpoint_hashtable from list_head to hlist_head Cc: stable(a)vger.kernel.org Signed-off-by: Al Viro <viro(a)zeniv.linux.org.uk> Signed-off-by: luanshi <zhangliguang(a)linux.alibaba.com> --- 7u/fs/mount.h | 2 +- 7u/fs/namespace.c | 85 +++++++++++++++++++++++++++++++++++++++++-------------- 2 files changed, 64 insertions(+), 23 deletions(-) diff --git a/7u/fs/mount.h b/7u/fs/mount.h index 7758dd4..75d5615 100644 --- a/7u/fs/mount.h +++ b/7u/fs/mount.h @@ -19,7 +19,7 @@ struct mnt_pcp { }; struct mountpoint { - struct list_head m_hash; + struct hlist_node m_hash; struct dentry *m_dentry; int m_count; }; diff --git a/7u/fs/namespace.c b/7u/fs/namespace.c index 76ba0d7..6e1231b 100644 --- a/7u/fs/namespace.c +++ b/7u/fs/namespace.c @@ -23,11 +23,34 @@ #include <linux/uaccess.h> #include <linux/proc_ns.h> #include <linux/magic.h> +#include <linux/bootmem.h> #include "pnode.h" #include "internal.h" -#define HASH_SHIFT 12 -#define HASH_SIZE (1UL << HASH_SHIFT) +static unsigned int m_hash_mask __read_mostly; +static unsigned int m_hash_shift __read_mostly; +static unsigned int mp_hash_mask __read_mostly; +static unsigned int mp_hash_shift __read_mostly; + +static __initdata unsigned long mhash_entries; +static int __init set_mhash_entries(char *str) +{ + if (!str) + return 0; + mhash_entries = simple_strtoul(str, &str, 0); + return 1; +} +__setup("mhash_entries=", set_mhash_entries); + +static __initdata unsigned long mphash_entries; +static int __init set_mphash_entries(char *str) +{ + if (!str) + return 0; + mphash_entries = simple_strtoul(str, &str, 0); + return 1; +} +__setup("mphash_entries=", set_mphash_entries); static u64 event; static DEFINE_IDA(mnt_id_ida); @@ -36,8 +59,8 @@ static DEFINE_SPINLOCK(mnt_id_lock); static int mnt_id_start = 0; static int mnt_group_start = 1; -static struct list_head mount_hashtable[HASH_SIZE]; -static struct list_head mountpoint_hashtable[HASH_SIZE]; +static struct list_head *mount_hashtable __read_mostly; +static struct hlist_head *mountpoint_hashtable __read_mostly; static struct kmem_cache *mnt_cache __read_mostly; static struct rw_semaphore namespace_sem; @@ -55,12 +78,19 @@ EXPORT_SYMBOL_GPL(fs_kobj); */ DEFINE_BRLOCK(vfsmount_lock); -static inline unsigned long hash(struct vfsmount *mnt, struct dentry *dentry) +static inline struct list_head *m_hash(struct vfsmount *mnt, struct dentry *dentry) { unsigned long tmp = ((unsigned long)mnt / L1_CACHE_BYTES); tmp += ((unsigned long)dentry / L1_CACHE_BYTES); - tmp = tmp + (tmp >> HASH_SHIFT); - return tmp & (HASH_SIZE - 1); + tmp = tmp + (tmp >> m_hash_shift); + return &mount_hashtable[tmp & m_hash_mask]; +} + +static inline struct hlist_head *mp_hash(struct dentry *dentry) +{ + unsigned long tmp = ((unsigned long)dentry / L1_CACHE_BYTES); + tmp = tmp + (tmp >> mp_hash_shift); + return &mountpoint_hashtable[tmp & mp_hash_mask]; } #define MNT_WRITER_UNDERFLOW_LIMIT -(1<<16) @@ -555,7 +585,7 @@ static void free_vfsmnt(struct mount *mnt) */ struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry) { - struct list_head *head = mount_hashtable + hash(mnt, dentry); + struct list_head *head = m_hash(mnt, dentry); struct mount *p; list_for_each_entry(p, head, mnt_hash) @@ -570,7 +600,7 @@ struct mount *__lookup_mnt(struct vfsmount *mnt, struct dentry *dentry) */ struct mount *__lookup_mnt_last(struct vfsmount *mnt, struct dentry *dentry) { - struct list_head *head = mount_hashtable + hash(mnt, dentry); + struct list_head *head = m_hash(mnt, dentry); struct mount *p; list_for_each_entry_reverse(p, head, mnt_hash) @@ -613,11 +643,11 @@ struct vfsmount *lookup_mnt(struct path *path) static struct mountpoint *new_mountpoint(struct dentry *dentry) { - struct list_head *chain = mountpoint_hashtable + hash(NULL, dentry); + struct hlist_head *chain = mp_hash(dentry); struct mountpoint *mp; int ret; - list_for_each_entry(mp, chain, m_hash) { + hlist_for_each_entry(mp, chain, m_hash) { if (mp->m_dentry == dentry) { /* might be worth a WARN_ON() */ if (d_unlinked(dentry)) @@ -639,7 +669,7 @@ static struct mountpoint *new_mountpoint(struct dentry *dentry) mp->m_dentry = dentry; mp->m_count = 1; - list_add(&mp->m_hash, chain); + hlist_add_head(&mp->m_hash, chain); return mp; } @@ -650,7 +680,7 @@ static void put_mountpoint(struct mountpoint *mp) spin_lock(&dentry->d_lock); dentry->d_flags &= ~DCACHE_MOUNTED; spin_unlock(&dentry->d_lock); - list_del(&mp->m_hash); + hlist_del(&mp->m_hash); kfree(mp); } } @@ -719,8 +749,7 @@ static void attach_mnt(struct mount *mnt, struct mountpoint *mp) { mnt_set_mountpoint(parent, mp, mnt); - list_add_tail(&mnt->mnt_hash, mount_hashtable + - hash(&parent->mnt, mp->m_dentry)); + list_add_tail(&mnt->mnt_hash, m_hash(&parent->mnt, mp->m_dentry)); list_add_tail(&mnt->mnt_child, &parent->mnt_mounts); } @@ -742,8 +771,8 @@ static void commit_tree(struct mount *mnt) list_splice(&head, n->list.prev); - list_add_tail(&mnt->mnt_hash, mount_hashtable + - hash(&parent->mnt, mnt->mnt_mountpoint)); + list_add_tail(&mnt->mnt_hash, + m_hash(&parent->mnt, mnt->mnt_mountpoint)); list_add_tail(&mnt->mnt_child, &parent->mnt_mounts); touch_mnt_namespace(n); } @@ -2792,12 +2821,24 @@ void __init mnt_init(void) mnt_cache = kmem_cache_create("mnt_cache", sizeof(struct mount), 0, SLAB_HWCACHE_ALIGN | SLAB_PANIC, NULL); - printk(KERN_INFO "Mount-cache hash table entries: %lu\n", HASH_SIZE); - - for (u = 0; u < HASH_SIZE; u++) + mount_hashtable = alloc_large_system_hash("Mount-cache", + sizeof(struct list_head), + mhash_entries, 19, + 0, + &m_hash_shift, &m_hash_mask, 0, 0); + mountpoint_hashtable = alloc_large_system_hash("Mountpoint-cache", + sizeof(struct hlist_head), + mphash_entries, 19, + 0, + &mp_hash_shift, &mp_hash_mask, 0, 0); + + if (!mount_hashtable || !mountpoint_hashtable) + panic("Failed to allocate mount hash table\n"); + + for (u = 0; u <= m_hash_mask; u++) INIT_LIST_HEAD(&mount_hashtable[u]); - for (u = 0; u < HASH_SIZE; u++) - INIT_LIST_HEAD(&mountpoint_hashtable[u]); + for (u = 0; u <= mp_hash_mask; u++) + INIT_HLIST_HEAD(&mountpoint_hashtable[u]); br_lock_init(&vfsmount_lock); -- 1.8.3.1

5 years, 8 months

1
0
0 0

[PATCH] MIPS: elf_hwcap: Export microMIPS and vz

by Jiaxun Yang

After further discussion with userland library develpoer, we addressed another two ASEs that can be used runtimely in programs. Export them in hwcap as well to benefit userspace programs. Signed-off-by: Jiaxun Yang <jiaxun.yang(a)flygoat.com> Cc: <stable(a)vger.kernel.org> # 4.4+ --- arch/mips/include/uapi/asm/hwcap.h | 2 ++ arch/mips/kernel/cpu-probe.c | 7 ++++++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/arch/mips/include/uapi/asm/hwcap.h b/arch/mips/include/uapi/asm/hwcap.h index 1ade1daa4921..e1a9bac62149 100644 --- a/arch/mips/include/uapi/asm/hwcap.h +++ b/arch/mips/include/uapi/asm/hwcap.h @@ -17,5 +17,7 @@ #define HWCAP_LOONGSON_MMI (1 << 11) #define HWCAP_LOONGSON_EXT (1 << 12) #define HWCAP_LOONGSON_EXT2 (1 << 13) +#define HWCAP_MIPS_MICROMIPS (1 << 14) +#define HWCAP_MIPS_VZ (1 << 15) #endif /* _UAPI_ASM_HWCAP_H */ diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c index f521cbf934e7..11e853d88aae 100644 --- a/arch/mips/kernel/cpu-probe.c +++ b/arch/mips/kernel/cpu-probe.c @@ -2213,8 +2213,13 @@ void cpu_probe(void) if (cpu_has_loongson_ext2) elf_hwcap |= HWCAP_LOONGSON_EXT2; - if (cpu_has_vz) + if (cpu_has_mmips) + elf_hwcap |= HWCAP_MIPS_MICROMIPS; + + if (cpu_has_vz) { + elf_hwcap |= HWCAP_MIPS_VZ; cpu_probe_vz(c); + } cpu_probe_vmbits(c); -- 2.23.0

5 years, 8 months

3
3
0 0

[PATCH] MIPS: tlbex: Fix build_restore_pagemask KScratch restore

by Paul Burton

build_restore_pagemask() will restore the value of register $1/$at when its restore_scratch argument is non-zero, and aims to do so by filling a branch delay slot. Commit 0b24cae4d535 ("MIPS: Add missing EHB in mtc0 -> mfc0 sequence.") added an EHB instruction (Execution Hazard Barrier) prior to restoring $1 from a KScratch register, in order to resolve a hazard that can result in stale values of the KScratch register being observed. In particular, P-class CPUs from MIPS with out of order execution pipelines such as the P5600 & P6600 are affected. Unfortunately this EHB instruction was inserted in the branch delay slot causing the MFC0 instruction which performs the restoration to no longer execute along with the branch. The result is that the $1 register isn't actually restored, ie. the TLB refill exception handler clobbers it - which is exactly the problem the EHB is meant to avoid for the P-class CPUs. Similarly build_get_pgd_vmalloc() will restore the value of $1/$at when its mode argument equals refill_scratch, and suffers from the same problem. Fix this by in both cases moving the EHB earlier in the emitted code. There's no reason it needs to immediately precede the MFC0 - it simply needs to be between the MTC0 & MFC0. This bug only affects Cavium Octeon systems which use build_fast_tlb_refill_handler(). Signed-off-by: Paul Burton <paulburton(a)kernel.org> Fixes: 0b24cae4d535 ("MIPS: Add missing EHB in mtc0 -> mfc0 sequence.") Cc: Dmitry Korotin <dkorotin(a)wavecomp.com> Cc: stable(a)vger.kernel.org # v3.15+ --- arch/mips/mm/tlbex.c | 23 +++++++++++++++-------- 1 file changed, 15 insertions(+), 8 deletions(-) diff --git a/arch/mips/mm/tlbex.c b/arch/mips/mm/tlbex.c index e01cb33bfa1a..41bb91f05688 100644 --- a/arch/mips/mm/tlbex.c +++ b/arch/mips/mm/tlbex.c @@ -653,6 +653,13 @@ static void build_restore_pagemask(u32 **p, struct uasm_reloc **r, int restore_scratch) { if (restore_scratch) { + /* + * Ensure the MFC0 below observes the value written to the + * KScratch register by the prior MTC0. + */ + if (scratch_reg >= 0) + uasm_i_ehb(p); + /* Reset default page size */ if (PM_DEFAULT_MASK >> 16) { uasm_i_lui(p, tmp, PM_DEFAULT_MASK >> 16); @@ -667,12 +674,10 @@ static void build_restore_pagemask(u32 **p, struct uasm_reloc **r, uasm_i_mtc0(p, 0, C0_PAGEMASK); uasm_il_b(p, r, lid); } - if (scratch_reg >= 0) { - uasm_i_ehb(p); + if (scratch_reg >= 0) UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg); - } else { + else UASM_i_LW(p, 1, scratchpad_offset(0), 0); - } } else { /* Reset default page size */ if (PM_DEFAULT_MASK >> 16) { @@ -921,6 +926,10 @@ build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, } if (mode != not_refill && check_for_high_segbits) { uasm_l_large_segbits_fault(l, *p); + + if (mode == refill_scratch && scratch_reg >= 0) + uasm_i_ehb(p); + /* * We get here if we are an xsseg address, or if we are * an xuseg address above (PGDIR_SHIFT+PGDIR_BITS) boundary. @@ -939,12 +948,10 @@ build_get_pgd_vmalloc64(u32 **p, struct uasm_label **l, struct uasm_reloc **r, uasm_i_jr(p, ptr); if (mode == refill_scratch) { - if (scratch_reg >= 0) { - uasm_i_ehb(p); + if (scratch_reg >= 0) UASM_i_MFC0(p, 1, c0_kscratch(), scratch_reg); - } else { + else UASM_i_LW(p, 1, scratchpad_offset(0), 0); - } } else { uasm_i_nop(p); } -- 2.23.0

5 years, 8 months

1
1
0 0

[PATCH] opp: of: drop incorrect lockdep_assert_held()

by Viresh Kumar

_find_opp_of_np() doesn't traverse the list of OPP tables but instead just the entries within an OPP table and so only requires to lock the OPP table itself. The lockdep_assert_held() was added there by mistake and isn't really required. Fixes: 5d6d106fa455 ("OPP: Populate required opp tables from "required-opps" property") Cc: v5.0+ <stable(a)vger.kernel.org> # v5.0+ Reported-by: Niklas Cassel <niklas.cassel(a)linaro.org> Signed-off-by: Viresh Kumar <viresh.kumar(a)linaro.org> --- drivers/opp/of.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/drivers/opp/of.c b/drivers/opp/of.c index 1813f5ad5fa2..6dc41faf74b5 100644 --- a/drivers/opp/of.c +++ b/drivers/opp/of.c @@ -77,8 +77,6 @@ static struct dev_pm_opp *_find_opp_of_np(struct opp_table *opp_table, { struct dev_pm_opp *opp; - lockdep_assert_held(&opp_table_lock); - mutex_lock(&opp_table->lock); list_for_each_entry(opp, &opp_table->opp_list, node) { -- 2.21.0.rc0.269.g1a574e7a288b

5 years, 8 months

2
3
0 0

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