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

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Date:   Sun, 25 Oct 2020 12:17:08 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     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 Mon, 26 Oct 2020 02:15:37 +0800 kernel test robot <lkp@...el.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   d76913908102044f14381df865bb74df17a538cb
> commit: cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4 kasan: allow enabling stack tagging for tag-based mode
> date:   3 months ago
> config: arm64-randconfig-r005-20201026 (attached as .config)
> compiler: clang version 12.0.0 (https://github.com/llvm/llvm-project 1c8371692dfe8245bc6690ff1262dcced4649d21)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # install arm64 cross compiling tool for clang build
>         # apt-get install binutils-aarch64-linux-gnu
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout cae9dc35ed9ff82a99754e51d57ff6c332e1f7e4
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/video/backlight/ltv350qv.c:192:12: warning: stack frame size of 13472 bytes in function 'ltv350qv_power' [-Wframe-larger-than=]

That's a lot of stack.

>    static int ltv350qv_power(struct ltv350qv *lcd, int power)
>               ^
>    1 warning generated.
> 
> 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()?