[patch 2/6] x86: mce: Disable preemption when calling raise_local()

[Thomas Gleixner <tglx@linutronix.de>]

[-- Attachment #1: x86-mce-disable-preemption-when-calling-raise-local.patch --]
[-- Type: text/plain, Size: 923 bytes --]

raise_mce() has a code path which does not disable preemption when the
raise_local() is called. The per cpu variable access in raise_local()
depends on preemption being disabled to be functional. So that code
path was either never tested or never tested with CONFIG_DEBUG_PREEMPT
enabled.

Add the missing preempt_disable/enable() pair around the call.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---
 arch/x86/kernel/cpu/mcheck/mce-inject.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: tip/arch/x86/kernel/cpu/mcheck/mce-inject.c
===================================================================
--- tip.orig/arch/x86/kernel/cpu/mcheck/mce-inject.c
+++ tip/arch/x86/kernel/cpu/mcheck/mce-inject.c
@@ -194,7 +194,11 @@ static void raise_mce(struct mce *m)
 		put_online_cpus();
 	} else
 #endif
+	{
+		preempt_disable();
 		raise_local();
+		preempt_enable();
+	}
 }
 
 /* Error injection interface */