[PATCH for review] [87/145] x86_64: remove lock prefix from is_at_popf() tests

[Andi Kleen]

r

From: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
The lock prefix will cause an exception when used with the
popf instruction, so no need to continue searching after it's
found.

Signed-off-by: Chuck Ebbert <76306.1226@xxxxxxxxxxxxxx>
Signed-off-by: Andi Kleen <ak@xxxxxxx>

---
 arch/x86_64/kernel/ptrace.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

Index: linux/arch/x86_64/kernel/ptrace.c
===================================================================
--- linux.orig/arch/x86_64/kernel/ptrace.c
+++ linux/arch/x86_64/kernel/ptrace.c
@@ -138,7 +138,7 @@ static int is_at_popf(struct task_struct
 		case 0x26: case 0x2e:
 		case 0x36: case 0x3e:
 		case 0x64: case 0x65:
-		case 0xf0: case 0xf2: case 0xf3:
+		case 0xf2: case 0xf3:
 			continue;
 
 		case 0x40 ... 0x4f:
@@ -148,7 +148,7 @@ static int is_at_popf(struct task_struct
 			/* 64-bit mode: REX prefix */
 			continue;
 
-			/* CHECKME: f0, f2, f3 */
+			/* CHECKME: f2, f3 */
 
 		/*
 		 * pushf: NOTE! We should probably not let
-
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