diff options
author | Neeraj Upadhyay <neeraju@codeaurora.org> | 2018-09-05 11:22:07 +0530 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-09-19 22:41:23 +0200 |
commit | 6b7b020bef06e1cd18b370867e9e77a1912d961f (patch) | |
tree | 069181ceee7f8b3c94c9e2bef4724a00e5f751fc /kernel | |
parent | a4db12abb871762dc0cd785f68af789e732ebcac (diff) |
cpu/hotplug: Adjust misplaced smb() in cpuhp_thread_fun()
commit f8b7530aa0a1def79c93101216b5b17cf408a70a upstream.
The smp_mb() in cpuhp_thread_fun() is misplaced. It needs to be after the
load of st->should_run to prevent reordering of the later load/stores
w.r.t. the load of st->should_run.
Fixes: 4dddfb5faa61 ("smp/hotplug: Rewrite AP state machine core")
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infraded.org>
Cc: josh@joshtriplett.org
Cc: peterz@infradead.org
Cc: jiangshanlai@gmail.com
Cc: dzickus@redhat.com
Cc: brendan.jackman@arm.com
Cc: malat@debian.org
Cc: mojha@codeaurora.org
Cc: sramana@codeaurora.org
Cc: linux-arm-msm@vger.kernel.org
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/1536126727-11629-1-git-send-email-neeraju@codeaurora.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'kernel')
-rw-r--r-- | kernel/cpu.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/kernel/cpu.c b/kernel/cpu.c index f80afc674f02..1a165bf6e81d 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -608,15 +608,15 @@ static void cpuhp_thread_fun(unsigned int cpu) bool bringup = st->bringup; enum cpuhp_state state; + if (WARN_ON_ONCE(!st->should_run)) + return; + /* * ACQUIRE for the cpuhp_should_run() load of ->should_run. Ensures * that if we see ->should_run we also see the rest of the state. */ smp_mb(); - if (WARN_ON_ONCE(!st->should_run)) - return; - cpuhp_lock_acquire(bringup); if (st->single) { |