This is a note to let you know that I've just added the patch titled

timers: Invoke timer_start_debug() where it makes sense

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: timers-invoke-timer_start_debug-where-it-makes-sense.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From fd45bb77ad682be728d1002431d77b8c73342836 Mon Sep 17 00:00:00 2001

From: Thomas Gleixner tglx@linutronix.de Date: Fri, 22 Dec 2017 15:51:14 +0100 Subject: timers: Invoke timer_start_debug() where it makes sense

From: Thomas Gleixner tglx@linutronix.de

commit fd45bb77ad682be728d1002431d77b8c73342836 upstream.

The timer start debug function is called before the proper timer base is set. As a consequence the trace data contains the stale CPU and flags values.

Call the debug function after setting the new base and flags.

Fixes: 500462a9de65 ("timers: Switch to a non-cascading wheel") Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: Peter Zijlstra peterz@infradead.org Cc: Frederic Weisbecker fweisbec@gmail.com Cc: Sebastian Siewior bigeasy@linutronix.de Cc: rt@linutronix.de Cc: Paul McKenney paulmck@linux.vnet.ibm.com Cc: Anna-Maria Gleixner anna-maria@linutronix.de Link: https://lkml.kernel.org/r/20171222145337.792907137@linutronix.de Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org

--- kernel/time/timer.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -1019,8 +1019,6 @@ __mod_timer(struct timer_list *timer, un if (!ret && pending_only) goto out_unlock;

- debug_activate(timer, expires); - new_base = get_target_base(base, timer->flags);

if (base != new_base) { @@ -1044,6 +1042,8 @@ __mod_timer(struct timer_list *timer, un } }

+ debug_activate(timer, expires); + timer->expires = expires; /* * If 'idx' was calculated above and the base time did not advance

Patches currently in stable-queue which might be from tglx@linutronix.de are

queue-4.9/nohz-prevent-a-timer-interrupt-storm-in-tick_nohz_stop_sched_tick.patch queue-4.9/timers-invoke-timer_start_debug-where-it-makes-sense.patch queue-4.9/x86-vm86-32-switch-to-flush_tlb_mm_range-in-mark_screen_rdonly.patch queue-4.9/x86-mm-add-the-nopcid-boot-option-to-turn-off-pcid.patch queue-4.9/x86-mm-enable-cr4.pcide-on-supported-systems.patch queue-4.9/sync-objtool-s-copy-of-x86-opcode-map.txt.patch queue-4.9/x86-smpboot-remove-stale-tlb-flush-invocations.patch queue-4.9/timers-use-deferrable-base-independent-of-base-nohz_active.patch queue-4.9/x86-mm-remove-the-up-asm-tlbflush.h-code-always-use-the-formerly-smp-code.patch queue-4.9/x86-mm-reimplement-flush_tlb_page-using-flush_tlb_mm_range.patch queue-4.9/x86-mm-make-flush_tlb_mm_range-more-predictable.patch queue-4.9/x86-mm-remove-flush_tlb-and-flush_tlb_current_task.patch queue-4.9/x86-mm-disable-pcid-on-32-bit-kernels.patch queue-4.9/timers-reinitialize-per-cpu-bases-on-hotplug.patch queue-4.9/x86-mm-64-fix-reboot-interaction-with-cr4.pcide.patch