* [patch] x86_64: remove lock prefix from is_at_popf() tests
@ 2006-08-01 11:00 Chuck Ebbert
2006-08-01 17:06 ` Andi Kleen
0 siblings, 1 reply; 2+ messages in thread
From: Chuck Ebbert @ 2006-08-01 11:00 UTC (permalink / raw)
To: Andi Kleen; +Cc: linux-kernel
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@compuserve.com>
--- 2.6.18-rc3-64.orig/arch/x86_64/kernel/ptrace.c
+++ 2.6.18-rc3-64/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
--
Chuck
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [patch] x86_64: remove lock prefix from is_at_popf() tests
2006-08-01 11:00 [patch] x86_64: remove lock prefix from is_at_popf() tests Chuck Ebbert
@ 2006-08-01 17:06 ` Andi Kleen
0 siblings, 0 replies; 2+ messages in thread
From: Andi Kleen @ 2006-08-01 17:06 UTC (permalink / raw)
To: Chuck Ebbert; +Cc: linux-kernel
On Tuesday 01 August 2006 13:00, Chuck Ebbert wrote:
> The lock prefix will cause an exception when used with the
> popf instruction, so no need to continue searching after it's
> found.
Applied thanks.
-Andi
^ permalink raw reply [flat|nested] 2+ messages in thread
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