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

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Date:   Thu, 18 Apr 2019 17:24:43 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Alexander Potapenko <glider@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
        David Rientjes <rientjes@...gle.com>,
        Christoph Lameter <cl@...ux.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        kasan-dev@...glegroups.com,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Akinobu Mita <akinobu.mita@...il.com>,
        iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>,
        Josef Bacik <josef@...icpanda.com>,
        linux-btrfs@...r.kernel.org, dm-devel@...hat.com,
        Mike Snitzer <snitzer@...hat.com>,
        Alasdair Kergon <agk@...hat.com>,
        intel-gfx@...ts.freedesktop.org,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        linux-arch@...r.kernel.org
Subject: Re: [patch V2 01/29] tracing: Cleanup stack trace code

On Thu, 18 Apr 2019 23:14:45 +0200 (CEST)
Thomas Gleixner <tglx@...utronix.de> wrote:

> 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.
>

I believe it was for historical leftovers (there was a time it was
required), and left there for "paranoid" sake. But let me apply the
patch and see if it is really needed.

-- Steve