Re: [PATCH 1/2] mm/madvise: introduce PR_MADV_SELF flag to process_madvise()

[Lorenzo Stoakes]

On Tue, Sep 24, 2024 at 11:15:17AM GMT, kernel test robot wrote:
> Hi Lorenzo,
>
> kernel test robot noticed the following build errors:
>
> [auto build test ERROR on akpm-mm/mm-everything]
> [also build test ERROR on soc/for-next linus/master v6.11 next-20240923]
> [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/Lorenzo-Stoakes/mm-madvise-introduce-PR_MADV_SELF-flag-to-process_madvise/20240924-000845
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-everything
> patch link:    https://lore.kernel.org/r/077be0d59cb1047870a84c87c62e7b027af1c75d.1727106751.git.lorenzo.stoakes%40oracle.com
> patch subject: [PATCH 1/2] mm/madvise: introduce PR_MADV_SELF flag to process_madvise()
> config: mips-ip32_defconfig (https://download.01.org/0day-ci/archive/20240924/202409241034.6ilzMh4w-lkp@xxxxxxxxx/config)
> compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project 8663a75fa2f31299ab8d1d90288d9df92aadee88)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240924/202409241034.6ilzMh4w-lkp@xxxxxxxxx/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@xxxxxxxxx>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202409241034.6ilzMh4w-lkp@xxxxxxxxx/
>
> All errors (new ones prefixed by >>):
>
>    In file included from mm/madvise.c:9:
>    In file included from include/linux/mman.h:5:
>    In file included from include/linux/mm.h:2198:
>    include/linux/vmstat.h:518:36: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>      518 |         return node_stat_name(NR_LRU_BASE + lru) + 3; // skip "nr_"
>          |                               ~~~~~~~~~~~ ^ ~~~
>    In file included from mm/madvise.c:21:
>    include/linux/mm_inline.h:47:41: warning: arithmetic between different enumeration types ('enum node_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>       47 |         __mod_lruvec_state(lruvec, NR_LRU_BASE + lru, nr_pages);
>          |                                    ~~~~~~~~~~~ ^ ~~~
>    include/linux/mm_inline.h:49:22: warning: arithmetic between different enumeration types ('enum zone_stat_item' and 'enum lru_list') [-Wenum-enum-conversion]
>       49 |                                 NR_ZONE_LRU_BASE + lru, nr_pages);
>          |                                 ~~~~~~~~~~~~~~~~ ^ ~~~
> >> mm/madvise.c:1514:15: error: use of undeclared identifier 'PR_MADV_SELF'
>     1514 |         if (flags & ~PR_MADV_SELF) {
>          |                      ^
>    mm/madvise.c:1527:14: error: use of undeclared identifier 'PR_MADV_SELF'
>     1527 |         if (flags & PR_MADV_SELF) {
>          |                     ^
>    3 warnings and 2 errors generated.

OK looks like mman-common.h is insufficient for some arches, will fix up and send out a v2.

>
>
> vim +/PR_MADV_SELF +1514 mm/madvise.c
>
>   1502
>   1503	SYSCALL_DEFINE5(process_madvise, int, pidfd, const struct iovec __user *, vec,
>   1504			size_t, vlen, int, behavior, unsigned int, flags)
>   1505	{
>   1506		ssize_t ret;
>   1507		struct iovec iovstack[UIO_FASTIOV];
>   1508		struct iovec *iov = iovstack;
>   1509		struct iov_iter iter;
>   1510		struct task_struct *task;
>   1511		struct mm_struct *mm;
>   1512		unsigned int f_flags;
>   1513
> > 1514		if (flags & ~PR_MADV_SELF) {
>
> --
> 0-DAY CI Kernel Test Service
> https://github.com/intel/lkp-tests/wiki