github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-07-27 09:36:22 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

mm/huge_memory: remove folio split check for READ_ONLY_THP_FOR_FS

Browse Source 
Without READ_ONLY_THP_FOR_FS, large file-backed folios cannot be created
by a FS without large folio support.  The check is no longer needed.

Link: https://lore.kernel.org/20260517135416.1434539-9-ziy@nvidia.com
Signed-off-by: Zi Yan <ziy@nvidia.com>
Reviewed-by: Lance Yang <lance.yang@linux.dev>
Reviewed-by: Lorenzo Stoakes (Oracle) <ljs@kernel.org>
Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Barry Song <baohua@kernel.org>
Cc: Chris Mason <clm@fb.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: David Sterba <dsterba@suse.com>
Cc: Dev Jain <dev.jain@arm.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Liam Howlett <liam@infradead.org>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Nico Pache <npache@redhat.com>
Cc: Ryan Roberts <ryan.roberts@arm.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Song Liu <songliubraving@fb.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Zi Yan 2026-05-17 09:54:10 -04:00 committed by Andrew Morton
parent 27e7918905
commit 7c16f524f2
1 changed files with 3 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
mm/huge_memory.c
View File

@ -3763,33 +3763,9 @@ int folio_check_splittable(struct folio *folio, unsigned int new_order,
if (!folio->mapping && !folio_test_anon(folio))
return -EBUSY;
if (folio_test_anon(folio)) {
/* order-1 is not supported for anonymous THP. */
if (new_order == 1)
return -EINVAL;
} else if (split_type == SPLIT_TYPE_NON_UNIFORM || new_order) {
if (IS_ENABLED(CONFIG_READ_ONLY_THP_FOR_FS) &&
!mapping_large_folio_support(folio->mapping)) {
/*
* We can always split a folio down to a single page
* (new_order == 0) uniformly.
*
* For any other scenario
* a) uniform split targeting a large folio
* (new_order > 0)
* b) any non-uniform split
* we must confirm that the file system supports large
* folios.
*
* Note that we might still have THPs in such
* mappings, which is created from khugepaged when
* CONFIG_READ_ONLY_THP_FOR_FS is enabled. But in that
* case, the mapping does not actually support large
* folios properly.
*/
return -EINVAL;
}
}
/* order-1 is not supported for anonymous THP. */
if (folio_test_anon(folio) && new_order == 1)
return -EINVAL;
/*
* swapcache folio could only be split to order 0