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authorRussell King <rmk+kernel@arm.linux.org.uk>2010-12-18 13:57:00 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2010-12-18 13:57:00 +0000
commit1ae1b5f053cf36bd0f913e83f3b136fec8152d4d (patch)
tree6cdbeadac1efdca5ec36e44e362e058da3def680 /arch
parentc15524a40a1603dc56a8691c4f50172fb86c23d8 (diff)
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 <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/smp.c1
1 files changed, 0 insertions, 1 deletions
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));