Re: [linux-next:master 12420/13171] include/linux/compiler_types.h:602:45: error: call to '__compiletime_assert_293' declared with attribute error: min(burstcnt, len - count - 1) signedness error

[David Laight <david.laight.linux@gmail.com>]

On Mon, 1 Dec 2025 20:18:45 +0800
kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   95cb2fd6ce0ad61af54191fe5ef271d7177f9c3a
> commit: 9ce4f8e56bd2ed2bd473572bbd4c1a7f8863487c [12420/13171] drivers/char/tpm: use min() instead of min_t()
> config: xtensa-randconfig-r123-20251201 (https://download.01.org/0day-ci/archive/20251201/202512012040.BkoYgkkr-lkp@intel.com/config)
> compiler: xtensa-linux-gcc (GCC) 11.5.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20251201/202512012040.BkoYgkkr-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@intel.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202512012040.BkoYgkkr-lkp@intel.com/
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from <command-line>:
>    drivers/char/tpm/tpm_tis_core.c: In function 'tpm_tis_send_data':
> >> include/linux/compiler_types.h:602:45: error: call to '__compiletime_assert_293' declared with attribute error: min(burstcnt, len - count - 1) signedness error  
...
>    drivers/char/tpm/tpm_tis_core.c:456:28: note: in expansion of macro 'min'
>      456 |                 burstcnt = min(burstcnt, len - count - 1);

I hate compiler differences.
Usually the:
	if (burstcnt < 0) {
		...
		goto out_err;
	}
a few lines higher is enough to make the statically_true(burstcnt >= 0) pass.

I'm not sure why it doesn't here.

	David