tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: 859de5033e15abefcf19935429e6478be97d889a commit: 875ffd41499ee5a3512da409cbd4c2ffd32b3cfa [1739/1739] mm: Do limit checking after memory allocation for memory reliable config: arm64-randconfig-r121-20250728 (https://download.01.org/0day-ci/archive/20250730/202507300533.PUdLd0KT-lkp@i...) compiler: aarch64-linux-gcc (GCC) 8.5.0 reproduce: (https://download.01.org/0day-ci/archive/20250730/202507300533.PUdLd0KT-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/202507300533.PUdLd0KT-lkp@intel.com/ sparse warnings: (new ones prefixed by >>) mm/page_alloc.c:140:1: sparse: sparse: symbol 'pcpu_drain_mutex' was not declared. Should it be static? mm/page_alloc.c:141:1: sparse: sparse: symbol '__pcpu_scope_pcpu_drain' was not declared. Should it be static? mm/page_alloc.c: note: in included file (through include/linux/mm.h): include/linux/gfp.h:324:27: sparse: sparse: restricted gfp_t degrades to integer include/linux/gfp.h:324:27: sparse: sparse: restricted gfp_t degrades to integer

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mm/page_alloc.c:4648:27: sparse: sparse: invalid assignment: &= mm/page_alloc.c:4648:27: sparse: left side has type restricted gfp_t mm/page_alloc.c:4648:27: sparse: right side has type int In file included from mm/page_alloc.c:70: mm/page_alloc.c: In function 'deferred_init_memmap': include/linux/ktask.h:123:21: warning: cast between incompatible function types from 'int (*)(long unsigned int, long unsigned int, struct deferred_args *)' to 'int (*)(void *, void *, void *)' [-Wcast-function-type] .kc_thread_func = (ktask_thread_func)(thread_func), 15- ^ include/linux/ktask.h:139:3: note: in expansion of macro 'KTASK_CTL_INITIALIZER' KTASK_CTL_INITIALIZER(thread_func, func_arg, min_chunk_size) 18- ^~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c:1730:3: note: in expansion of macro 'DEFINE_KTASK_CTL' DEFINE_KTASK_CTL(ctl, deferred_init_chunk, &args, ^~~~~~~~~~~~~~~~ include/linux/ktask.h:123:21: warning: cast between incompatible function types from 'int (*)(long unsigned int, long unsigned int, struct deferred_args *)' to 'int (*)(void *, void *, void *)' [-Wcast-function-type] .kc_thread_func = (ktask_thread_func)(thread_func), 24- ^ include/linux/ktask.h:139:3: note: in expansion of macro 'KTASK_CTL_INITIALIZER' KTASK_CTL_INITIALIZER(thread_func, func_arg, min_chunk_size) 27- ^~~~~~~~~~~~~~~~~~~~~ mm/page_alloc.c:1746:3: note: in expansion of macro 'DEFINE_KTASK_CTL' DEFINE_KTASK_CTL(ctl, deferred_free_chunk, &args, ^~~~~~~~~~~~~~~~ mm/page_alloc.c:3083: warning: Function parameter or member 'mt' not described in '__putback_isolated_page'

vim +4648 mm/page_alloc.c 4606 4607 /* 4608 * return true means memory allocation need retry and flag ___GFP_RELIABILITY 4609 * must be cleared. 4610 */ 4611 static inline bool check_after_alloc(gfp_t *gfp_mask, unsigned int order, 4612 int preferred_nid, nodemask_t *nodemask, 4613 struct page **_page) 4614 { 4615 if (!mem_reliable_is_enabled()) 4616 return false; 4617 4618 if (!(*gfp_mask & ___GFP_RELIABILITY)) 4619 return false; 4620 4621 if (!*_page) 4622 goto out_retry; 4623 4624 if (*gfp_mask & __GFP_NOFAIL) 4625 goto out; 4626 4627 /* check water mark, reserver mirrored mem for kernel */ 4628 if (!mem_reliable_watermark_ok(1 << order)) 4629 goto out_free_page; 4630 4631 /* percpu counter is not initialized, ignore limit check */ 4632 if (!mem_reliable_counter_initialized()) 4633 goto out; 4634 4635 /* spcial user task, systemd is limited by task_reliable_limit */ 4636 if (((current->flags & PF_RELIABLE) || is_global_init(current)) && 4637 !reliable_mem_limit_check(1 << order)) 4638 goto out_free_page; 4639 4640 goto out; 4641 4642 out_free_page: 4643 __free_pages(*_page, order); 4644 *_page = NULL; 4645 4646 out_retry: 4647 if (reliable_allow_fb_enabled() || is_global_init(current)) {

4648 *gfp_mask &= ~___GFP_RELIABILITY; 4649 return true; 4650 } 4651 4652 if (*gfp_mask & (__GFP_NORETRY | __GFP_RETRY_MAYFAIL | __GFP_THISNODE)) 4653 goto out; 4654 4655 /* Coredumps can quickly deplete all memory reserves */ 4656 if (current->flags & PF_DUMPCORE) 4657 goto out; 4658 /* The OOM killer will not help higher order allocs */ 4659 if (order > PAGE_ALLOC_COSTLY_ORDER) 4660 goto out; 4661 4662 /* oom here */ 4663 mem_reliable_out_of_memory(*gfp_mask, order, preferred_nid, 4664 nodemask); 4665 out: 4666 return false; 4667 } 4668

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