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33 lines
1.1 KiB
Diff
33 lines
1.1 KiB
Diff
From 1ae1b5f053cf36bd0f913e83f3b136fec8152d4d Mon Sep 17 00:00:00 2001
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From: Russell King <rmk+kernel@arm.linux.org.uk>
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Date: Sat, 18 Dec 2010 13:57:00 +0000
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Subject: [PATCH 02/66] 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
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CPU - doing so results in mm_users incrementing by one each time we
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hotplug a CPU, which will eventually wrap, and will cause problems.
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Other architectures such as x86 do not increment mm_users, but only
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mm_count, so we follow that pattern.
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Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
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---
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arch/arm/kernel/smp.c | 1 -
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1 files changed, 0 insertions(+), 1 deletions(-)
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diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
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index 8c19595..9066473 100644
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--- a/arch/arm/kernel/smp.c
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+++ b/arch/arm/kernel/smp.c
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@@ -310,7 +310,6 @@ asmlinkage void __cpuinit secondary_start_kernel(void)
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* All kernel threads share the same mm context; grab a
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* reference and switch to it.
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*/
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- atomic_inc(&mm->mm_users);
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atomic_inc(&mm->mm_count);
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current->active_mm = mm;
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cpumask_set_cpu(cpu, mm_cpumask(mm));
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--
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1.6.6.1
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