linux-kernel - Re: drivers/video/backlight/ltv350qv.c:192:12: warning: stack frame size of 13472 bytes in function 'ltv350qv

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Message-ID: <7e76d1c3239bf2d33889c4874bc9919fee6b6ebe.camel@perches.com>
Date:   Sun, 25 Oct 2020 12:23:21 -0700
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        kernel test robot <lkp@...el.com>
Cc:     Andrey Konovalov <andreyknvl@...gle.com>, kbuild-all@...ts.01.org,
        clang-built-linux@...glegroups.com, linux-kernel@...r.kernel.org,
        Linux Memory Management List <linux-mm@...ck.org>
Subject: Re: drivers/video/backlight/ltv350qv.c:192:12: warning: stack frame
 size of 13472 bytes in function 'ltv350qv_power'

On Sun, 2020-10-25 at 12:17 -0700, Andrew Morton wrote:
> On Mon, 26 Oct 2020 02:15:37 +0800 kernel test robot <lkp@...el.com> wrote:
> > vim +/ltv350qv_power +192 drivers/video/backlight/ltv350qv.c
> 
> Odd - the code looks pretty normal.  It is possible that your compiler
> is (crazily) inlining ltv350qv_write_reg()?

There's a lot of stack used when gcc's compiler options include

           -fsanitize=object-size
               This option enables instrumentation of memory references using
               the "__builtin_object_size" function.  Various out of bounds
               pointer accesses are detected.

Perhaps this config enables it?