linux-kernel - Re: lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes

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Date:   Mon, 19 Oct 2020 08:47:16 -0700
From:   Joe Perches <joe@...ches.com>
To:     kernel test robot <lkp@...el.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes
 is larger than 1024 bytes

On Mon, 2020-10-19 at 03:13 +0800, kernel test robot wrote:
> Hi Ard,
> 
> First bad commit (maybe != root cause):
> 
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   9d9af1007bc08971953ae915d88dc9bb21344b53
> commit: 5fb8ef25803ef33e2eb60b626435828b937bed75 crypto: chacha - move existing library code into lib/crypto
> date:   11 months ago
> config: i386-randconfig-r023-20201019 (attached as .config)
> compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
> reproduce (this is a W=1 build):
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5fb8ef25803ef33e2eb60b626435828b937bed75
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout 5fb8ef25803ef33e2eb60b626435828b937bed75
>         # save the attached .config to linux build tree
>         make W=1 ARCH=i386 
> 
> 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 >>):
> 
>    lib/crypto/chacha.c: In function 'chacha_permute':
> > > lib/crypto/chacha.c:65:1: warning: the frame size of 1604 bytes is larger than 1024 bytes [-Wframe-larger-than=]
>       65 | }
>          | ^
> 
> vim +65 lib/crypto/chacha.c

This seems to come from function tracing overhead.

It it really useful to add function tracing to what
should be a single instruction?

AFAIK:

There isn't a good way to turn function tracing off
on a per-function basis.

Adding notrace doesn't work for that.  Should it?