linux-kernel - [PATCH] ix86: relax a pvops stub clobber specification

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Message-Id: <5894542B02000078001366C5@prv-mh.provo.novell.com>
Date:   Fri, 03 Feb 2017 01:58:03 -0700
From:   "Jan Beulich" <JBeulich@...e.com>
To:     <mingo@...e.hu>, <tglx@...utronix.de>, <hpa@...or.com>
Cc:     <linux-kernel@...r.kernel.org>
Subject: [PATCH] ix86: relax a pvops stub clobber specification

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@...e.com>
---
 arch/x86/entry/entry_32.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 4.10-rc6/arch/x86/entry/entry_32.S
+++ 4.10-rc6-ix86-relax-clobber/arch/x86/entry/entry_32.S
@@ -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