linux-kernel - Re: [PATCH v2] stacktrace: don't skip first entry on noncurrent tasks

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Message-ID: <20191029133526.tqzo4axnuyozaqzc@treble>
Date:   Tue, 29 Oct 2019 08:35:26 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Jiri Slaby <jslaby@...e.cz>
Cc:     tglx@...utronix.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] stacktrace: don't skip first entry on noncurrent tasks

On Tue, Oct 29, 2019 at 08:19:44AM +0100, Jiri Slaby wrote:
> When doing cat /proc/<PID>/stack, the output is missing the first entry.
> When the current code walks the stack starting in stack_trace_save_tsk,
> it skips all scheduler functions (that's OK) plus one more function. But
> this one function should be skipped only for the 'current' task as it is
> stack_trace_save_tsk proper.
> 
> The original code (before the common infrastructure) skipped one
> function only for the 'current' task -- see save_stack_trace_tsk before
> 3599fe12a125. So do so also in the new infrastructure now.
> 
> Signed-off-by: Jiri Slaby <jslaby@...e.cz>
> Fixes: 214d8ca6ee85 ("stacktrace: Provide common infrastructure")
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Josh Poimboeuf <jpoimboe@...hat.com>
> ---
> 
> Notes:
>     [v2] add the same for the !CONFIG_ARCH_STACKWALK case

Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>

-- 
Josh