BACKPORT: mm: remove folio from deferred split list before uncharging it
When freeing a large folio, we must remove it from the deferred split list before we uncharge it as each memcg has its own deferred split list (with associated lock) and removing a folio from the deferred split list while holding the wrong lock will corrupt that list and cause various related problems. Link: https://lore.kernel.org/linux-mm/367a14f7-340e-4b29-90ae-bc3fcefdd5f4@arm.com/ Link: https://lkml.kernel.org/r/20240311191835.312162-1-willy@infradead.org Fixes: f77171d2 (mm: allow non-hugetlb large folios to be batch processed) Fixes: 29f38430 (mm: free folios directly in move_folios_to_lru()) Fixes: bc2ff4cb (mm: free folios in a batch in shrink_folio_list()) Change-Id: I012dfb4c33678bb1e8a546a6dc78a0227858aa5b Signed-off-by:Matthew Wilcox (Oracle) <willy@infradead.org> Debugged-by:
Ryan Roberts <ryan.roberts@arm.com> Tested-by:
Ryan Roberts <ryan.roberts@arm.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> (cherry picked from commit 47932e70) [ Drop changes to shrink_folio_list() and move_folios_to_lru() in mm/vmscan.c since they both call destroy_large_folio() which removes the folio from the deferred split list - Kalesh Singh ] [ Use folio_unqueue_deferred_split() instead of folio_undo_large_unmappable(); which also performs the necessary large folio checks - Kalesh Singh ] Bug: 419599659 Signed-off-by:
Kalesh Singh <kaleshsingh@google.com>
Loading