hugetlb: evaluate subpool free state while locked

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unlock_or_release_subpool() drops spool->lock before calling
subpool_is_free().  However, subpool_is_free() reads fields that are
updated under spool->lock, including count, used_hpages and rsv_hpages.

Keep the free-state evaluation under the same lock that protects those
fields.  The reservation accounting and kfree() calls still happen after
dropping spool->lock.

Link: https://lore.kernel.org/20260721035207.1437935-1-chenyichong@uniontech.com
Signed-off-by: Yichong Chen <chenyichong@uniontech.com>
Reviewed-by: Joshua Hahn <joshua.hahnjy@gmail.com>
Reviewed-by: Jane Chu <jane.chu@oracle.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

...

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Yichong Chen 2026-07-21 11:52:07 +08:00 • committed by Andrew Morton

parent 64a853c9a6

commit 47f3cecd72

1 changed files with 4 additions and 2 deletions

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mm/hugetlb.c

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