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mm/mincore: hold PTL in mincore_hugetlb

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Hold PTL in mincore_hugetlb() to avoid operating on stale page, as
mincore_pte_range() have done.

Link: https://lkml.kernel.org/r/20250724090958.455887-4-tujinjiang@huawei.com
Signed-off-by: Jinjiang Tu <tujinjiang@huawei.com>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Andrei Vagin <avagin@gmail.com>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Brahmajit Das <brahmajit.xyz@gmail.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: David Rientjes <rientjes@google.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Joern Engel <joern@logfs.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Jinjiang Tu 2025-07-24 17:09:58 +08:00 committed by Andrew Morton
parent 9109bd5255
commit 1623717b05
1 changed files with 3 additions and 0 deletions
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3
mm/mincore.c
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@ -29,7 +29,9 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
#ifdef CONFIG_HUGETLB_PAGE #ifdef CONFIG_HUGETLB_PAGE
unsigned char present; unsigned char present;
unsigned char *vec = walk->private; unsigned char *vec = walk->private;
spinlock_t *ptl;
ptl = huge_pte_lock(hstate_vma(walk->vma), walk->mm, pte);
/* /*
* Hugepages under user process are always in RAM and never * Hugepages under user process are always in RAM and never
* swapped out, but theoretically it needs to be checked. * swapped out, but theoretically it needs to be checked.
@ -38,6 +40,7 @@ static int mincore_hugetlb(pte_t *pte, unsigned long hmask, unsigned long addr,
for (; addr != end; vec++, addr += PAGE_SIZE) for (; addr != end; vec++, addr += PAGE_SIZE)
*vec = present; *vec = present;
walk->private = vec; walk->private = vec;
spin_unlock(ptl);
#else #else
BUG(); BUG();
#endif #endif