linux-kernel - Re: [PATCH] [RFC] maple_tree: reduce stack usage with gcc-9 and earlier

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Date:   Tue, 14 Feb 2023 13:07:40 +0100
From:   David Hildenbrand <david@...hat.com>
To:     Arnd Bergmann <arnd@...nel.org>,
        "Liam R. Howlett" <Liam.Howlett@...cle.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Andrey Ryabinin <ryabinin.a.a@...il.com>,
        Alexander Potapenko <glider@...gle.com>,
        Andrey Konovalov <andreyknvl@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        kasan-dev@...glegroups.com,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vernon Yang <vernon2gm@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] maple_tree: reduce stack usage with gcc-9 and
 earlier

On 14.02.23 11:30, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
> 
> gcc-10 changed the way inlining works to be less aggressive, but
> older versions run into an oversized stack frame warning whenever
> CONFIG_KASAN_STACK is enabled, as that forces variables from
> inlined callees to be non-overlapping:
> 
> lib/maple_tree.c: In function 'mas_wr_bnode':
> lib/maple_tree.c:4320:1: error: the frame size of 1424 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
> 
> Change the annotations on mas_store_b_node() and mas_commit_b_node()
> to explicitly forbid inlining in this configuration, which is
> the same behavior that newer versions already have.
> 
> Cc: Andrey Ryabinin <ryabinin.a.a@...il.com>
> Cc: Alexander Potapenko <glider@...gle.com>
> Cc: Andrey Konovalov <andreyknvl@...il.com>
> Cc: Dmitry Vyukov <dvyukov@...gle.com>
> Cc: Vincenzo Frascino <vincenzo.frascino@....com>
> Cc: kasan-dev@...glegroups.com
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---

Reviewed-by: David Hildenbrand <david@...hat.com>

-- 
Thanks,

David / dhildenb