linux-kernel - Re: [patch V3 24/29] tracing: Remove the last struct stack

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Date:   Thu, 25 Apr 2019 08:30:32 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>, x86@...nel.org,
        Andy Lutomirski <luto@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Alexander Potapenko <glider@...gle.com>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org,
        David Rientjes <rientjes@...gle.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>,
        Christoph Hellwig <hch@....de>,
        iommu@...ts.linux-foundation.org,
        Robin Murphy <robin.murphy@....com>,
        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>,
        Daniel Vetter <daniel@...ll.ch>,
        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>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Tom Zanussi <tom.zanussi@...ux.intel.com>,
        Miroslav Benes <mbenes@...e.cz>, linux-arch@...r.kernel.org
Subject: Re: [patch V3 24/29] tracing: Remove the last struct stack_trace
 usage

On Thu, Apr 25, 2019 at 11:45:17AM +0200, Thomas Gleixner wrote:
> Simplify the stack retrieval code by using the storage array based
> interface.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> ---
>  kernel/trace/trace_stack.c |   37 ++++++++++++++++---------------------
>  1 file changed, 16 insertions(+), 21 deletions(-)
> 
> --- a/kernel/trace/trace_stack.c
> +++ b/kernel/trace/trace_stack.c
> @@ -23,11 +23,7 @@
>  static unsigned long stack_dump_trace[STACK_TRACE_ENTRIES];
>  static unsigned stack_trace_index[STACK_TRACE_ENTRIES];
>  
> -struct stack_trace stack_trace_max = {
> -	.max_entries		= STACK_TRACE_ENTRIES,
> -	.entries		= &stack_dump_trace[0],
> -};
> -
> +static unsigned int stack_trace_entries;

"stack_trace_entries" -> "nr_stack_trace_entries"

-- 
Josh