4:32 a.m.
On Tue, Jun 15, 2021 at 05:03:40PM +0100, Matthew Wilcox wrote:
On Tue, Jun 15, 2021 at 11:58:36PM +0800, kernel test robot wrote:
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm64
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp(a)intel.com>
>
> All warnings (new ones prefixed by >>):
>
> >> mm/hugetlb.c:1591:9: warning: no previous prototype for function
'hugetlb_basepage_index' [-Wmissing-prototypes]
> pgoff_t hugetlb_basepage_index(struct page *page)
So clang requires the prototype to still be in scope, while gcc doesn't.
Does one of our clangers want to file a bug about that?
I see the exact same warning with GCC 11.1.0:
$ curl -LSs https://lore.kernel.org/linux-mm/202106152328.Mh5S48hE-lkp@intel.com/2-a.bin |
gzip -d > .config
$ make -skj"$(nproc)" ARCH=arm64 CROSS_COMPILE=aarch64-linux- W=1 olddefconfig
mm/hugetlb.c
mm/hugetlb.c:1591:9: warning: no previous prototype for 'hugetlb_basepage_index'
[-Wmissing-prototypes]
1591 | pgoff_t hugetlb_basepage_index(struct page *page)
| ^~~~~~~~~~~~~~~~~~~~~~
Cheers,
Nathan