github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-11-06 21:58:01 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

mm: use a folio in the softleaf_is_device_private path

Browse Source 
Use the folio APIs in the device_private migration path of do_swap_page(),
replacing four calls to compound_head() with two page_folio() calls.  The
second one re-fetches the folio from vmf->page after migrate_to_ram(),
which might have split the folio.

Link: https://lore.kernel.org/20260819095144.45660-1-hongfu.li@linux.dev
Signed-off-by: Hongfu Li <lihongfu@kylinos.cn>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Suggested-by: David Hildenbrand (Arm) <david@kernel.org>
Link: https://lore.kernel.org/all/e20678ed-3fa1-4677-a1d7-e2af481e8302@kernel.org/
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
This commit is contained in:
Hongfu Li 2026-08-19 17:51:43 +08:00 committed by Andrew Morton
parent ff47652a4b
commit 5121682509
1 changed files with 9 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
mm/memory.c
View File

@ -4926,18 +4926,21 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
goto unlock;
/*
* Get a page reference while we know the page can't be
* freed.
* Get a folio reference while we know the folio can't
* be freed.
*/
if (trylock_page(vmf->page)) {
folio = page_folio(vmf->page);
if (folio_trylock(folio)) {
struct dev_pagemap *pgmap;
get_page(vmf->page);
folio_get(folio);
pte_unmap_unlock(vmf->pte, vmf->ptl);
pgmap = page_pgmap(vmf->page);
ret = pgmap->ops->migrate_to_ram(vmf);
unlock_page(vmf->page);
put_page(vmf->page);
/* migrate_to_ram() might have split the folio. */
folio = page_folio(vmf->page);
folio_unlock(folio);
folio_put(folio);
} else {
pte_unmap(vmf->pte);
softleaf_entry_wait_on_locked(entry, vmf->ptl);