Re: [PATCH v3 04/10] mm/kasan: define __asan_before_dynamic_init, __asan_after_dynamic_init

[Alexander Potapenko <glider@google.com>]

On Tue, Jul 29, 2025 at 1:44 PM kernel test robot <lkp@intel.com> wrote:
>
> Hi Alexander,
>
> kernel test robot noticed the following build warnings:
>
> [auto build test WARNING on tip/x86/core]
> [also build test WARNING on akpm-mm/mm-everything shuah-kselftest/next shuah-kselftest/fixes linus/master v6.16 next-20250729]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>
> url:    https://github.com/intel-lab-lkp/linux/commits/Alexander-Potapenko/x86-kcov-disable-instrumentation-of-arch-x86-kernel-tsc-c/20250728-232935
> base:   tip/x86/core
> patch link:    https://lore.kernel.org/r/20250728152548.3969143-5-glider%40google.com
> patch subject: [PATCH v3 04/10] mm/kasan: define __asan_before_dynamic_init, __asan_after_dynamic_init
> config: powerpc-allmodconfig (https://download.01.org/0day-ci/archive/20250729/202507291913.UMbUQv95-lkp@intel.com/config)
> compiler: powerpc64-linux-gcc (GCC) 15.1.0
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250729/202507291913.UMbUQv95-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/202507291913.UMbUQv95-lkp@intel.com/
>
> All warnings (new ones prefixed by >>):
>
>    In file included from mm/kasan/kasan_test_c.c:32:
> >> mm/kasan/kasan.h:585:6: warning: conflicting types for built-in function '__asan_before_dynamic_init'; expected 'void(const void *)' [-Wbuiltin-declaration-mismatch]
>      585 | void __asan_before_dynamic_init(const char *module_name);
>          |      ^~~~~~~~~~~~~~~~~~~~~~~~~~
>

For some reason GCC declares this function as a `void(const void *)`,
whereas LLVM goes with `void @__asan_before_dynamic_init(i64)` (not to
mention that ASan userspace runtime expects a const char * parameter).
I'll change the prototype to match that from GCC, because Clang does
not care much.