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Message-ID: <478676AE.9000101@zytor.com>
Date: Thu, 10 Jan 2008 11:49:02 -0800
From: "H. Peter Anvin" <hpa@...or.com>
To: Harvey Harrison <harvey.harrison@...il.com>
CC: Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: Use wrmsrl in kprobes.c, step.c
Harvey Harrison wrote:
> Where x86_32 passed zero in the high 32 bits, use wrmsrl which
> will zero extend for us. This allows ifdefs for 32/64 bit to
> be eliminated.
>
> Eliminate ifdef in step.c. Similar cleanup was done when unifying
> kprobes_32|64.c and wrmsr() was chosen there over wrmsrl(). This
> patch changes these to wrmsrl.
>
> Signed-off-by: Harvey Harrison <harvey.harrison@...il.com>
> ---
> arch/x86/kernel/kprobes.c | 4 ++--
> arch/x86/kernel/step.c | 4 ----
> 2 files changed, 2 insertions(+), 6 deletions(-)
>
> diff --git a/arch/x86/kernel/kprobes.c b/arch/x86/kernel/kprobes.c
> index 53ba6a5..34becd1 100644
> --- a/arch/x86/kernel/kprobes.c
> +++ b/arch/x86/kernel/kprobes.c
> @@ -410,13 +410,13 @@ static void __kprobes set_current_kprobe(struct kprobe *p, struct pt_regs *regs,
> static void __kprobes clear_btf(void)
> {
> if (test_thread_flag(TIF_DEBUGCTLMSR))
> - wrmsr(MSR_IA32_DEBUGCTLMSR, 0, 0);
> + wrmsrl(MSR_IA32_DEBUGCTLMSR, 0L);
> }
Drop the L. It doesn't buy you anything, and gcc will sign-extend for
you anyway. It's just visual clutter.
-hpa
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