linux-kernel - Re: [patch V2 01/29] tracing: Cleanup stack trace code

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Message-ID: <alpine.DEB.2.21.1904182313470.3174@nanos.tec.linutronix.de>
Date:   Thu, 18 Apr 2019 23:14:45 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Josh Poimboeuf <jpoimboe@...hat.com>
cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
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        Andrew Morton <akpm@...ux-foundation.org>,
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Subject: Re: [patch V2 01/29] tracing: Cleanup stack trace code

On Thu, 18 Apr 2019, Josh Poimboeuf wrote:

> On Thu, Apr 18, 2019 at 10:41:20AM +0200, Thomas Gleixner wrote:
> > - Remove the extra array member of stack_dump_trace[]. It's not required as
> >   the stack tracer stores at max array size - 1 entries so there is still
> >   an empty slot.
> 
> What is the empty slot used for?

I was trying to find an answer but failed. Maybe it's just historical
leftovers or Steven knows where the magic is in this maze.

Thanks,

	tglx