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mm, hugetlb: increment the number of pages to be reset on HVO

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commit 4eeec8c89a ("mm: move hugetlb specific things in folio to
page[3]") shifted hugetlb specific stuff, and now mapping overlaps
_hugetlb_cgroup field.

Upon restoring the vmemmap for HVO, only the first two tail pages are
reset, and this causes the check in free_tail_page_prepare() to fail as it
finds an unexpected mapping value in some tails.

Increment the number of pages to be reset to 4 (head + 3 tail pages)

Link: https://lkml.kernel.org/r/20250415111859.376302-1-osalvador@suse.de
Fixes: 4eeec8c89a ("mm: move hugetlb specific things in folio to page[3]")
Signed-off-by: Oscar Salvador <osalvador@suse.de>
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Muchun Song <muchun.song@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Oscar Salvador 2025-04-15 13:18:59 +02:00 committed by Andrew Morton
parent 9e888998ea
commit 274fe92de2
1 changed files with 3 additions and 3 deletions
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6
mm/hugetlb_vmemmap.c
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@ -238,11 +238,11 @@ static void vmemmap_remap_pte(pte_t *pte, unsigned long addr,
* struct page, the special metadata (e.g. page->flags or page->mapping)
* cannot copy to the tail struct page structs. The invalid value will be
* checked in the free_tail_page_prepare(). In order to avoid the message
* of "corrupted mapping in tail page". We need to reset at least 3 (one
* head struct page struct and two tail struct page structs) struct page
* of "corrupted mapping in tail page". We need to reset at least 4 (one
* head struct page struct and three tail struct page structs) struct page
* structs.
*/
#define NR_RESET_STRUCT_PAGE 3
#define NR_RESET_STRUCT_PAGE 4
static inline void reset_struct_pages(struct page *start)
{