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 22:43:36 +0200 |
commit | cb26258540913d80cc3fe2f36e9b02fe3b91cf0f (patch) | |
tree | 4bccf7b48865a6298b1bf25a9298ac8c3653e628 /kernel | |
parent | cc427108861907dffd590598e300b36420de7e75 (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 8f02f9b6e046..9d9645da94fc 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -612,15 +612,15 @@ 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) { |