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ARM: smp: avoid incrementing mm_users on CPU startup

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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 <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2010-12-18 13:57:00 +00:00
parent c15524a40a
commit 1ae1b5f053
1 changed files with 0 additions and 1 deletions
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arch/arm/kernel/smp.c
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@ -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));