linux-kernel - Re: [PATCH 07/26] brcmsmac: reduce stack size with KASAN

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Date:   Mon, 6 Mar 2017 12:18:33 +0100
From:   Arnd Bergmann <arnd@...db.de>
To:     Arend Van Spriel <arend.vanspriel@...adcom.com>
Cc:     kasan-dev <kasan-dev@...glegroups.com>,
        Andrey Ryabinin <aryabinin@...tuozzo.com>,
        Alexander Potapenko <glider@...gle.com>,
        Dmitry Vyukov <dvyukov@...gle.com>,
        Networking <netdev@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-media@...r.kernel.org,
        linux-wireless <linux-wireless@...r.kernel.org>,
        kernel-build-reports@...ts.linaro.org,
        "David S . Miller" <davem@...emloft.net>
Subject: Re: [PATCH 07/26] brcmsmac: reduce stack size with KASAN

On Mon, Mar 6, 2017 at 12:16 PM, Arnd Bergmann <arnd@...db.de> wrote:
> On Mon, Mar 6, 2017 at 12:02 PM, Arend Van Spriel
> <arend.vanspriel@...adcom.com> wrote:
>> On 6-3-2017 11:38, Arnd Bergmann wrote:
>>> On Mon, Mar 6, 2017 at 10:16 AM, Arend Van Spriel
>>> <arend.vanspriel@...adcom.com> wrote:

>> Given the amount of local variables maybe just tag the functions with
>> noinline instead.
>
> But that would result in less efficient object code without KASAN,
> as inlining these by default is a good idea when the stack variables
> all get folded.

Note that David Laight alread suggested renaming noinline_for_kasan
to noinline_if_stackbloat, which makes it a little more obvious what
is going on. Would that address your concern as well?

    Arnd