From: Russell King Date: Sat, 18 Dec 2010 13:57:00 +0000 (+0000) Subject: ARM: smp: avoid incrementing mm_users on CPU startup X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=1ae1b5f053cf36bd0f913e83f3b136fec8152d4d;p=linux-beck.git ARM: smp: avoid incrementing mm_users on CPU startup We should not be incrementing mm_users when we startup a secondary CPU - doing so results in mm_users incrementing by one each time we hotplug a CPU, which will eventually wrap, and will cause problems. Other architectures such as x86 do not increment mm_users, but only mm_count, so we follow that pattern. Signed-off-by: Russell King --- diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c index 8c1959590252..9066473c0ebc 100644 --- a/arch/arm/kernel/smp.c +++ b/arch/arm/kernel/smp.c @@ -310,7 +310,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void) * All kernel threads share the same mm context; grab a * reference and switch to it. */ - atomic_inc(&mm->mm_users); atomic_inc(&mm->mm_count); current->active_mm = mm; cpumask_set_cpu(cpu, mm_cpumask(mm));