Re: [akpm-mm:mm-unstable 340/601] include/linux/compiler_types.h:702:38: error: call to '__compiletime_assert_501' declared with attribute error: BUILD_BUG failed

On Sat, 25 Jul 2026 08:56:41 +0800 kernel test robot <[email protected]> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-unstable
> head:   c04df384b55dd9dcf72c36b661becb5aaba371a9
> commit: d2aed7c02fafacb9d055a2f683ac12e977ef16e0 [340/601] mm: preserve RWP marker across PTE rewrites
> config: sparc64-randconfig-r134-20260725 (https://download.01.org/0day-ci/archive/20260725/[email protected]/config)
> compiler: sparc64-linux-gcc (GCC) 8.5.0
> sparse: v0.6.5-rc1
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260725/[email protected]/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 <[email protected]>
> | Closes: https://lore.kernel.org/oe-kbuild-all/[email protected]/
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from <command-line>:
>    mm/huge_memory.c: In function 'move_pages_huge_pmd':
> >> include/linux/compiler_types.h:702:38: error: call to '__compiletime_assert_501' declared with attribute error: BUILD_BUG failed
>      _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>                                          ^
>    include/linux/compiler_types.h:683:4: note: in definition of macro '__compiletime_assert'
>        prefix ## suffix();    \

Well dang.

I can't reproduce with sparc64 gcc-15.2.0. 
Documentation/process/changes.rst says we support 8,1, released in
2018.  Your 8.5 was released in 2021 so perhaps three other people are
still using it :(

https://www.kernel.org/pub/tools/crosstool/ doesn't appear to have
sparc64 gcc-8.5 so I gave up.

So I dunno.  I'm inclined to ignore and assume that if someone else hits
this one day, they'll either fix it or provide us with enough details
to figure it out.