linux-kernel - [PATCH] ARM: Fix spinlock bad magic on disabling nonboot cpu

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Date:	Fri, 19 Nov 2010 18:16:53 -0800
From:	Colin Cross <ccross@...roid.com>
To:	linux-arm-kernel@...ts.infradead.org
Cc:	Colin Cross <ccross@...roid.com>,
	Russell King <linux@....linux.org.uk>,
	Catalin Marinas <catalin.marinas@....com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: Fix spinlock bad magic on disabling nonboot cpu

The init_mm.context.id_lock spinlock is not initialized, which
causes a spinlock bad magic warning when nonboot cpus are disabled,
either through hotplug or during suspend.

Signed-off-by: Colin Cross <ccross@...roid.com>
---
 arch/arm/include/asm/mmu.h |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)

diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h
index 68870c7..1556f6a 100644
--- a/arch/arm/include/asm/mmu.h
+++ b/arch/arm/include/asm/mmu.h
@@ -13,6 +13,8 @@ typedef struct {
 
 #ifdef CONFIG_CPU_HAS_ASID
 #define ASID(mm)	((mm)->context.id & 255)
+#define INIT_MM_CONTEXT(name)                                                 \
+        .context.id_lock = __SPIN_LOCK_UNLOCKED(name.context.id_lock),
 #else
 #define ASID(mm)	(0)
 #endif
-- 
1.7.3.1

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