linux-kernel - [PATCH] x86: suppress stack overrun message for init

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Message-Id: <4B06AEFE02000078000211F4@vpn.id2.novell.com>
Date:	Fri, 20 Nov 2009 14:00:14 +0000
From:	"Jan Beulich" <JBeulich@...ell.com>
To:	<mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] x86: suppress stack overrun message for init_task

init_task doesn't get its stack end location set to STACK_END_MAGIC,
and hence the message is confusing rather than helpful in this case.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

---
 arch/x86/mm/fault.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- linux-2.6.32-rc8/arch/x86/mm/fault.c
+++ 2.6.32-rc8-x86-init-task-stack/arch/x86/mm/fault.c
@@ -658,7 +658,7 @@ no_context(struct pt_regs *regs, unsigne
 	show_fault_oops(regs, error_code, address);
 
 	stackend = end_of_stack(tsk);
-	if (*stackend != STACK_END_MAGIC)
+	if (tsk != &init_task && *stackend != STACK_END_MAGIC)
 		printk(KERN_ALERT "Thread overran stack, or stack corrupted\n");
 
 	tsk->thread.cr2		= address;



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