tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: bca07979c0a7054331b91c892163a0d214cffcbe commit: 0f0c3021514f52310056c32406b4b760fc9a7e6e [18302/22019] share_pool: Apply sp_group_id_by_pid() to multi-group-mode config: arm64-randconfig-r111-20240331 (https://download.01.org/0day-ci/archive/20240402/202404020952.XAujhr6P-lkp@i...) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce: (https://download.01.org/0day-ci/archive/20240402/202404020952.XAujhr6P-lkp@i...) 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/202404020952.XAujhr6P-lkp@intel.com/ sparse warnings: (new ones prefixed by >>)

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mm/share_pool.c:837:29: sparse: sparse: incompatible types for operation (<=): mm/share_pool.c:837:29: sparse: int *num mm/share_pool.c:837:29: sparse: int mm/share_pool.c:1628:9: sparse: sparse: undefined identifier 'sysctl_compaction_handler' mm/share_pool.c: In function 'sp_group_id_by_pid': mm/share_pool.c:837:29: warning: ordered comparison of pointer with integer zero [-Wextra] 837 | if (!spg_ids || num <= 0) | ^~ mm/share_pool.c: In function 'sp_compact_nodes': mm/share_pool.c:1628:9: error: implicit declaration of function 'sysctl_compaction_handler' [-Werror=implicit-function-declaration] 1628 | sysctl_compaction_handler(NULL, 1, NULL, NULL, NULL); | ^~~~~~~~~~~~~~~~~~~~~~~~~ In function 'vmalloc_area_clr_flag', inlined from 'sp_make_share_k2u' at mm/share_pool.c:2550:8: mm/share_pool.c:2396:18: warning: 'spa' may be used uninitialized [-Wmaybe-uninitialized] 2396 | spa->kva = 0; | ~~~~~~~~~^~~ mm/share_pool.c: In function 'sp_make_share_k2u': mm/share_pool.c:2429:25: note: 'spa' was declared here 2429 | struct sp_area *spa; | ^~~ mm/share_pool.c:2562:16: warning: 'uva' may be used uninitialized [-Wmaybe-uninitialized] 2562 | return uva; | ^~~ mm/share_pool.c:2427:15: note: 'uva' was declared here 2427 | void *uva; | ^~~ mm/share_pool.c: In function 'sp_group_post_exit': mm/share_pool.c:3863:37: warning: 'alloc_size' may be used uninitialized [-Wmaybe-uninitialized] 3863 | if (alloc_size != 0 || k2u_size != 0) | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ mm/share_pool.c:3831:14: note: 'alloc_size' was declared here 3831 | long alloc_size, k2u_size; | ^~~~~~~~~~ mm/share_pool.c:3863:37: warning: 'k2u_size' may be used uninitialized [-Wmaybe-uninitialized] 3863 | if (alloc_size != 0 || k2u_size != 0) | ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~ mm/share_pool.c:3831:26: note: 'k2u_size' was declared here 3831 | long alloc_size, k2u_size; | ^~~~~~~~ cc1: some warnings being treated as errors

vim +837 mm/share_pool.c 815 816 /** 817 * sp_group_id_by_pid() - Get the sp_group ID array of a process. 818 * @pid: pid of target process. 819 * @spg_ids point to an array to save the group ids the process belongs to 820 * @num input the spg_ids array size; output the spg number of the process 821 * 822 * Return: 823 * >0 - the sp_group ID. 824 * -ENODEV - target process doesn't belong to any sp_group. 825 * -EINVAL - spg_ids or num is NULL. 826 * -E2BIG - the num of groups process belongs to is larger than *num 827 */ 828 int sp_group_id_by_pid(int pid, int *spg_ids, int *num) 829 { 830 int ret = 0; 831 struct sp_group_node *node; 832 struct sp_group_master *master = NULL; 833 struct task_struct *tsk; 834 835 check_interrupt_context(); 836

837 if (!spg_ids || num <= 0) 838 return -EINVAL; 839 840 ret = get_task(pid, &tsk); 841 if (ret) 842 return ret; 843 844 down_read(&sp_group_sem); 845 task_lock(tsk); 846 if (tsk->mm) 847 master = tsk->mm->sp_group_master; 848 task_unlock(tsk); 849 850 if (!master) { 851 ret = -ENODEV; 852 goto out_up_read; 853 } 854 855 if (!master->count) { 856 ret = -ENODEV; 857 goto out_up_read; 858 } 859 if ((unsigned int)*num < master->count) { 860 ret = -E2BIG; 861 goto out_up_read; 862 } 863 *num = master->count; 864 865 list_for_each_entry(node, &master->node_list, group_node) 866 *(spg_ids++) = node->spg->id; 867 868 out_up_read: 869 up_read(&sp_group_sem); 870 put_task_struct(tsk); 871 return ret; 872 } 873 EXPORT_SYMBOL_GPL(sp_group_id_by_pid); 874

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