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Commit 29fe5f3b authored by Andi Kleen's avatar Andi Kleen Committed by Linus Torvalds
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[PATCH] i386: Add kernel thread stack frame termination for properly stopping stack unwinds. 



One open question: Should this added push perhaps be made conditional
upon CONFIG_STACK_UNWIND or CONFIG_UNWIND_INFO?
[AK: not needed, these are all very slow paths]

Signed-off-by: default avatarJan Beulich <jbeulich@novell.com>
Signed-off-by: default avatarAndi Kleen <ak@suse.de>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c05991ed

arch/i386/kernel/head.S

+4 −10
Original line number Diff line number Diff line
@@ -317,20 +317,14 @@ is386: movl $2,%ecx # set MP 
	movl %eax,%gs

	lldt %ax

	cld			# gcc2 wants the direction flag cleared at all times

	pushl %eax		# fake return address

#ifdef CONFIG_SMP

	movb ready, %cl

	movb $1, ready

	cmpb $0,%cl

	je 1f			# the first CPU calls start_kernel

				# all other CPUs call initialize_secondary

	call initialize_secondary

	jmp L6

1:

	cmpb $0,%cl		# the first CPU calls start_kernel

	jne initialize_secondary # all other CPUs call initialize_secondary

#endif /* CONFIG_SMP */

	call start_kernel

L6:

	jmp L6			# main should never return here, but

				# just in case, we know what happens.

	jmp start_kernel



/*

 * We depend on ET to be correct. This checks for 287/387.