linux-kernel - Re: [PATCH v3 7/7] powerpc: kprobes: remove duplicate saving of msr

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Message-Id: <20170419234338.24997b39e18506f07e4897bf@kernel.org>
Date:   Wed, 19 Apr 2017 23:43:38 +0900
From:   Masami Hiramatsu <mhiramat@...nel.org>
To:     "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Ingo Molnar <mingo@...nel.org>,
        Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 7/7] powerpc: kprobes: remove duplicate saving of msr

On Wed, 19 Apr 2017 18:21:06 +0530
"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com> wrote:

> set_current_kprobe() already saves regs->msr into kprobe_saved_msr. Remove
> the redundant save.
> 

Looks good to me.

Reviewed-by: Masami Hiramatsu <mhiramat@...nel.org>

Thank you,

> Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
> ---
>  arch/powerpc/kernel/kprobes.c | 1 -
>  1 file changed, 1 deletion(-)
> 
> diff --git a/arch/powerpc/kernel/kprobes.c b/arch/powerpc/kernel/kprobes.c
> index 067e9863bfdf..5c0a1ffcbcf9 100644
> --- a/arch/powerpc/kernel/kprobes.c
> +++ b/arch/powerpc/kernel/kprobes.c
> @@ -272,7 +272,6 @@ int __kprobes kprobe_handler(struct pt_regs *regs)
>  			 */
>  			save_previous_kprobe(kcb);
>  			set_current_kprobe(p, regs, kcb);
> -			kcb->kprobe_saved_msr = regs->msr;
>  			kprobes_inc_nmissed_count(p);
>  			prepare_singlestep(p, regs);
>  			kcb->kprobe_status = KPROBE_REENTER;
> -- 
> 2.12.1
> 


-- 
Masami Hiramatsu <mhiramat@...nel.org>