linux-kernel - [PATCH] ix86/entry: add instruction suffix

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Date:   Mon, 25 Jun 2018 04:21:59 -0600
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/entry: add instruction suffix

Omitting suffixes from instructions in AT&T mode is bad practice when
operand size cannot be determined by the assembler from register
operands, and is likely going to be warned about by upstream gas in the
future (mine does already). Add the single missing suffix here.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
---
 arch/x86/entry/entry_32.S |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- 4.18-rc2/arch/x86/entry/entry_32.S
+++ 4.18-rc2-ix86-entry-insn-suffix/arch/x86/entry/entry_32.S
@@ -477,7 +477,7 @@ ENTRY(entry_SYSENTER_32)
 	 * whereas POPF does not.)
 	 */
 	addl	$PT_EFLAGS-PT_DS, %esp	/* point esp at pt_regs->flags */
-	btr	$X86_EFLAGS_IF_BIT, (%esp)
+	btrl	$X86_EFLAGS_IF_BIT, (%esp)
 	popfl
 
 	/*