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Message-ID: <200608010703_MC3-1-C6B1-9266@compuserve.com> Date: Tue, 1 Aug 2006 07:00:59 -0400 From: Chuck Ebbert <76306.1226@...puserve.com> To: Andi Kleen <ak@...e.de> Cc: linux-kernel <linux-kernel@...r.kernel.org> Subject: [patch] x86_64: remove lock prefix from is_at_popf() tests 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@...puserve.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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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