Re: [PATCH 2/2] kpageflags: fix wrong KPF_THP on non-pmd-mappable compound pages

[ran xiaokai <ranxiaokai627@163.com>]

>On Thu Jun 27, 2024 at 8:38 AM EDT, ran xiaokai wrote:
>> > Hi ran,
>> > 
>> > kernel test robot noticed the following build errors:
>> > 
>> > [auto build test ERROR on akpm-mm/mm-everything]
>> > [also build test ERROR on linus/master v6.10-rc5 next-20240625]
>> > [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/ran-xiaokai/mm-Constify-folio_order-folio_test_pmd_mappable/20240626-113027
>> > base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
>> > patch link:    https://lore.kernel.org/r/20240626024924.1155558-3-ranxiaokai627%40163.com
>> > patch subject: [PATCH 2/2] kpageflags: fix wrong KPF_THP on non-pmd-mappable compound pages
>> > config: x86_64-allnoconfig (https://download.01.org/0day-ci/archive/20240626/202406262300.iAURISyJ-lkp@intel.com/config)
>> > compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
>> > reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240626/202406262300.iAURISyJ-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/202406262300.iAURISyJ-lkp@intel.com/
>> > 
>> > All errors (new ones prefixed by >>):
>> > 
>> > >> fs/proc/page.c:151:35: error: passing 'const struct folio *' to parameter of type 'struct folio *' discards qualifiers [-Werror,-Wincompatible-pointer-types-discards-qualifiers]
>> >      151 |         else if (folio_test_pmd_mappable(folio)) {
>> >          |                                          ^~~~~
>> >    include/linux/huge_mm.h:438:58: note: passing argument to parameter 'folio' here
>> >      438 | static inline bool folio_test_pmd_mappable(struct folio *folio)
>> >          |                                                          ^
>> >    1 error generated.
>>
>> Hi,
>>
>> This patch is the second patch of the serial:
>> https://lore.kernel.org/lkml/20240626024924.1155558-1-ranxiaokai627@163.com/
>>
>> and it relies on the first patch:
>> https://lore.kernel.org/lkml/20240626024924.1155558-2-ranxiaokai627@163.com/
>>
>> and it seems the first patch is not applied.
>> Or in this case, we should not split these two patches?
>
>No, this is the definition when THP is disabled. You only changed the
>definition when THP is enabled.

Thanks for reminding. 
Will fix this.

>-- 
>Best Regards,
>Yan, Zi
>