Re: [linux-next:master 7435/9209] include/linux/compiler_types.h:328:38: error: call to '__compiletime_assert_236' declared with attribute error: unexpected size in kmalloc_index()

[Andrew Morton <akpm@linux-foundation.org>]

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On Sat, 12 Jun 2021 00:08:43 +0800 kernel test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   25fe90f43fa312213b653dc1f12fd2d80f855883
> commit: df2de13a32afec989c0e735beb3bc391b3de1dbd [7435/9209] mm, slub: change run-time assertion in kmalloc_index() to compile-time
> config: sparc-randconfig-r005-20210611 (attached as .config)
> compiler: sparc64-linux-gcc (GCC) 9.3.0
> 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
>         # https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/commit/?id=df2de13a32afec989c0e735beb3bc391b3de1dbd
>         git remote add linux-next https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git
>         git fetch --no-tags linux-next master
>         git checkout df2de13a32afec989c0e735beb3bc391b3de1dbd
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross ARCH=sparc 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All errors (new ones prefixed by >>):
> 
>    In file included from <command-line>:
>    In function 'kmalloc_index',
>        inlined from 'kmalloc_node' at include/linux/slab.h:572:20,
>        inlined from 'bpf_map_kmalloc_node.isra.0.part.0' at include/linux/bpf.h:1319:9:
> >> include/linux/compiler_types.h:328:38: error: call to '__compiletime_assert_236' declared with attribute error: unexpected size in kmalloc_index()
>      328 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>          |                                      ^
>    include/linux/compiler_types.h:309:4: note: in definition of macro '__compiletime_assert'
>      309 |    prefix ## suffix();    \
>          |    ^~~~~~
>    include/linux/compiler_types.h:328:2: note: in expansion of macro '_compiletime_assert'
>      328 |  _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>          |  ^~~~~~~~~~~~~~~~~~~
>    include/linux/build_bug.h:39:37: note: in expansion of macro 'compiletime_assert'
>       39 | #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg)
>          |                                     ^~~~~~~~~~~~~~~~~~
>    include/linux/slab.h:389:2: note: in expansion of macro 'BUILD_BUG_ON_MSG'
>      389 |  BUILD_BUG_ON_MSG(1, "unexpected size in kmalloc_index()");
>          |  ^~~~~~~~~~~~~~~~
>

This log doesn't show which .c file was being compiled at the time. 
Can this info be included?

For me, it was kernel/bpf/local_storage.c.

I don't see anything wrong with the code.  Did this gcc simply screw up
__builtin_constant_p()?