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| author | Andrew Morton <akpm@linux-foundation.org> | 2024-07-06 11:44:41 -0700 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2024-07-06 11:44:41 -0700 |
| commit | 8ef6fd0e9ea83a792ba53882ddc6e0d38ce0d636 (patch) | |
| tree | b119eaeb76c7afb8672d30078ab7061cb7be67fb /include/linux/mmzone.h | |
| parent | 44195d1eba826a8af0afbcfa69ab4cc26f6ead7f (diff) | |
| parent | 1e3d28fe03cdac1f58402e4da1e1e59fb70d145f (diff) | |
| download | lwn-8ef6fd0e9ea83a792ba53882ddc6e0d38ce0d636.tar.gz lwn-8ef6fd0e9ea83a792ba53882ddc6e0d38ce0d636.zip | |
Merge branch 'mm-hotfixes-stable' into mm-stable to pick up "mm: fix
crashes from deferred split racing folio migration", needed by "mm:
migrate: split folio_migrate_mapping()".
Diffstat (limited to 'include/linux/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index cb7f265c2b96..41458892bc8a 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -1981,8 +1981,9 @@ static inline int subsection_map_index(unsigned long pfn) static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) { int idx = subsection_map_index(pfn); + struct mem_section_usage *usage = READ_ONCE(ms->usage); - return test_bit(idx, READ_ONCE(ms->usage)->subsection_map); + return usage ? test_bit(idx, usage->subsection_map) : 0; } #else static inline int pfn_section_valid(struct mem_section *ms, unsigned long pfn) |