linux-kernel - Re: [PATCH v12 01/10] arm64: Remove NULL task check from unwind

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Message-ID: <YdcTq8sk/q1zW8va@FVFF77S0Q05N>
Date:   Thu, 6 Jan 2022 16:07:07 +0000
From:   Mark Rutland <mark.rutland@....com>
To:     madvenka@...ux.microsoft.com
Cc:     broonie@...nel.org, jpoimboe@...hat.com, ardb@...nel.org,
        nobuta.keiya@...itsu.com, sjitindarsingh@...il.com,
        catalin.marinas@....com, will@...nel.org, jmorris@...ei.org,
        linux-arm-kernel@...ts.infradead.org,
        live-patching@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v12 01/10] arm64: Remove NULL task check from
 unwind_frame()

On Mon, Jan 03, 2022 at 10:52:03AM -0600, madvenka@...ux.microsoft.com wrote:
> From: "Madhavan T. Venkataraman" <madvenka@...ux.microsoft.com>
> 
> Currently, there is a check for a NULL task in unwind_frame(). It is not
> needed since all current consumers pass a non-NULL task.
> 
> Signed-off-by: Madhavan T. Venkataraman <madvenka@...ux.microsoft.com>
> Reviewed-by: Mark Brown <broonie@...nel.org>

Reviewed-by: Mark Rutland <mark.rutland@....com>

Mark.

> ---
>  arch/arm64/kernel/stacktrace.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
> index 0fb58fed54cb..5f5bb35b7b41 100644
> --- a/arch/arm64/kernel/stacktrace.c
> +++ b/arch/arm64/kernel/stacktrace.c
> @@ -69,9 +69,6 @@ static int notrace unwind_frame(struct task_struct *tsk,
>  	unsigned long fp = frame->fp;
>  	struct stack_info info;
>  
> -	if (!tsk)
> -		tsk = current;
> -
>  	/* Final frame; nothing to unwind */
>  	if (fp == (unsigned long)task_pt_regs(tsk)->stackframe)
>  		return -ENOENT;
> -- 
> 2.25.1
>