From: Chuck Ebbert <76306.1226@compuserve.com>
To: Andi Kleen <ak@suse.de>
Cc: linux-kernel <linux-kernel@vger.kernel.org>
Subject: [patch] x86_64: remove lock prefix from is_at_popf() tests
Date: Tue, 1 Aug 2006 07:00:59 -0400 [thread overview]
Message-ID: <200608010703_MC3-1-C6B1-9266@compuserve.com> (raw)
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
next reply other threads:[~2006-08-01 11:09 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-08-01 11:00 Chuck Ebbert [this message]
2006-08-01 17:06 ` Andi Kleen
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