linux-kernel - Re: [PATCH 1/2] arm64: stacktrace: avoid listing stacktrace functions in stacktrace

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Message-ID: <20170904102930.nuop6zscgp2frvat@armageddon.cambridge.arm.com>
Date:   Mon, 4 Sep 2017 11:29:30 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Prakash Gupta <guptap@...eaurora.org>, mhocko@...e.com,
        vbabka@...e.cz, will.deacon@....com, iamjoonsoo.kim@....com,
        rmk+kernel@....linux.org.uk, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: [PATCH 1/2] arm64: stacktrace: avoid listing stacktrace
 functions in stacktrace

On Wed, Aug 30, 2017 at 01:28:28PM -0700, Andrew Morton wrote:
> On Wed, 30 Aug 2017 13:02:22 +0530 Prakash Gupta <guptap@...eaurora.org> wrote:
> 
> > The stacktraces always begin as follows:
> > 
> >  [<c00117b4>] save_stack_trace_tsk+0x0/0x98
> >  [<c0011870>] save_stack_trace+0x24/0x28
> >  ...
> > 
> > This is because the stack trace code includes the stack frames for itself.
> > This is incorrect behaviour, and also leads to "skip" doing the wrong thing
> > (which is the number of stack frames to avoid recording.)
> > 
> > Perversely, it does the right thing when passed a non-current thread.  Fix
> > this by ensuring that we have a known constant number of frames above the
> > main stack trace function, and always skip these.
> > 
> > This was fixed for arch arm by Commit 3683f44c42e9 ("ARM: stacktrace: avoid
> > listing stacktrace functions in stacktrace")
> 
> I can take this (with acks, please?)

In case you haven't picked it up already:

Acked-by: Catalin Marinas <catalin.marinas@....com>