From: Gautham R Shenoy Date: Mon, 6 Nov 2006 07:52:04 +0000 (-0800) Subject: [PATCH] Fix the spurious unlock_cpu_hotplug false warnings X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=4b96b1a10cb00c867103b21f0f2a6c91b705db11;p=GitHub%2FLineageOS%2FG12%2Fandroid_kernel_amlogic_linux-4.9.git [PATCH] Fix the spurious unlock_cpu_hotplug false warnings Cpu-hotplug locking has a minor race case caused because of setting the variable "recursive" to NULL *after* releasing the cpu_bitmask_lock in the function unlock_cpu_hotplug,instead of doing so before releasing the cpu_bitmask_lock. This was the cause of most of the recent false spurious lock_cpu_unlock warnings. This should fix the problem reported by Martin Lorenz reported in http://lkml.org/lkml/2006/10/29/127. Thanks to Srinivasa DS for pointing it out. Signed-off-by: Gautham R Shenoy Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/kernel/cpu.c b/kernel/cpu.c index 663c920b2234..272254f20d97 100644 --- a/kernel/cpu.c +++ b/kernel/cpu.c @@ -58,8 +58,8 @@ void unlock_cpu_hotplug(void) recursive_depth--; return; } - mutex_unlock(&cpu_bitmask_lock); recursive = NULL; + mutex_unlock(&cpu_bitmask_lock); } EXPORT_SYMBOL_GPL(unlock_cpu_hotplug);