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x86/entry/32: Relax a pvops stub clobber specification

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The code at .Lrestore_nocheck does not make any assumptions on register
values, so all registers can be clobbered on code paths leading there.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/5894542B02000078001366C5@prv-mh.provo.novell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Jan Beulich 2017-02-03 01:58:03 -07:00 committed by Ingo Molnar
parent 2d6be4abf5
commit fdbd518adf
1 changed files with 1 additions and 1 deletions
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arch/x86/entry/entry_32.S
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@ -585,7 +585,7 @@ ENTRY(iret_exc )
* will soon execute iret and the tracer was already set to
* the irqstate after the IRET:
*/
DISABLE_INTERRUPTS(CLBR_EAX)
DISABLE_INTERRUPTS(CLBR_ANY)
lss (%esp), %esp /* switch to espfix segment */
jmp .Lrestore_nocheck
#endif