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authorLinus Torvalds <torvalds@linux-foundation.org>2022-04-08 14:31:41 -1000
committerLinus Torvalds <torvalds@linux-foundation.org>2022-04-08 14:31:41 -1000
commit911b2b95168c7790ed5ea2703d804086c03088df (patch)
tree221e4fa69720af910218cb676bf71d99ec4dedae /include
parent1a3b1bba7c7a5eb8a11513cf88427cb9d77bc60a (diff)
parent4071a1b9e24ee394b7492bff7542707ee9ad986d (diff)
downloadlinux-911b2b95168c7790ed5ea2703d804086c03088df.tar.bz2
Merge branch 'akpm' (patches from Andrew)
Merge fixes from Andrew Morton: "9 patches. Subsystems affected by this patch series: mm (migration, highmem, sparsemem, mremap, mempolicy, and memcg), lz4, mailmap, and MAINTAINERS" * emailed patches from Andrew Morton <akpm@linux-foundation.org>: MAINTAINERS: add Tom as clang reviewer mm/list_lru.c: revert "mm/list_lru: optimize memcg_reparent_list_lru_node()" mailmap: update Vasily Averin's email address mm/mempolicy: fix mpol_new leak in shared_policy_replace mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) mm/sparsemem: fix 'mem_section' will never be NULL gcc 12 warning lz4: fix LZ4_decompress_safe_partial read out of bound highmem: fix checks in __kmap_local_sched_{in,out} mm: migrate: use thp_order instead of HPAGE_PMD_ORDER for new page allocation.
Diffstat (limited to 'include')
-rw-r--r--include/linux/mmzone.h11
1 files changed, 7 insertions, 4 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 962b14d403e8..46ffab808f03 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -1397,13 +1397,16 @@ static inline unsigned long *section_to_usemap(struct mem_section *ms)
static inline struct mem_section *__nr_to_section(unsigned long nr)
{
+ unsigned long root = SECTION_NR_TO_ROOT(nr);
+
+ if (unlikely(root >= NR_SECTION_ROOTS))
+ return NULL;
+
#ifdef CONFIG_SPARSEMEM_EXTREME
- if (!mem_section)
+ if (!mem_section || !mem_section[root])
return NULL;
#endif
- if (!mem_section[SECTION_NR_TO_ROOT(nr)])
- return NULL;
- return &mem_section[SECTION_NR_TO_ROOT(nr)][nr & SECTION_ROOT_MASK];
+ return &mem_section[root][nr & SECTION_ROOT_MASK];
}
extern size_t mem_section_usage_size(void);