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x86-64: Fix unwind annotations in recent NMI changes 

While in one case a plain annotation is necessary, in the other
case the stack adjustment can simply be folded into the
immediately preceding RESTORE_ALL, thus getting the correct
annotation for free.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Alexander van Heukelum <heukelum@mailshack.com>
Link: http://lkml.kernel.org/r/51010C9302000078000B9045@nat28.tlf.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jan Beulich 2013-01-24 09:27:31 +00:00 committed by Ingo Molnar
parent 021ef050fc
commit 444723dccc
1 changed files with 3 additions and 4 deletions
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7
arch/x86/kernel/entry_64.S
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@ -1781,6 +1781,7 @@ first_nmi:
* Leave room for the "copied" frame
*/
subq $(5*8), %rsp
CFI_ADJUST_CFA_OFFSET 5*8
/* Copy the stack frame to the Saved frame */
.rept 5
@ -1863,10 +1864,8 @@ end_repeat_nmi:
nmi_swapgs:
SWAPGS_UNSAFE_STACK
nmi_restore:
RESTORE_ALL 8
/* Pop the extra iret frame */
addq $(5*8), %rsp
/* Pop the extra iret frame at once */
RESTORE_ALL 6*8
/* Clear the NMI executing stack variable */
movq $0, 5*8(%rsp)