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| author | Johannes Weiner <hannes@cmpxchg.org> | 2021-09-02 23:53:18 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-09-03 18:58:10 +0200 |
| commit | 3047250972ff935b1d7a0629fa3acb04c12dcc07 (patch) | |
| tree | dafce1d1a6e20b3798b6279bff92466cf0d8336c /mm/vmscan.c | |
| parent | writeback: use READ_ONCE for unlocked reads of writeback stats (diff) | |
| download | linux-3047250972ff935b1d7a0629fa3acb04c12dcc07.tar.xz linux-3047250972ff935b1d7a0629fa3acb04c12dcc07.zip | |
mm: remove irqsave/restore locking from contexts with irqs enabled
The page cache deletion paths all have interrupts enabled, so no need to
use irqsafe/irqrestore locking variants.
They used to have irqs disabled by the memcg lock added in commit
c4843a7593a9 ("memcg: add per cgroup dirty page accounting"), but that has
since been replaced by memcg taking the page lock instead, commit
0a31bc97c80c ("mm: memcontrol: rewrite uncharge AP").
Link: https://lkml.kernel.org/r/20210614211904.14420-1-hannes@cmpxchg.org
Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 9 |
1 files changed, 4 insertions, 5 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index 17c4b3fdd7dd..268ad6570751 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1052,14 +1052,13 @@ static pageout_t pageout(struct page *page, struct address_space *mapping) static int __remove_mapping(struct address_space *mapping, struct page *page, bool reclaimed, struct mem_cgroup *target_memcg) { - unsigned long flags; int refcount; void *shadow = NULL; BUG_ON(!PageLocked(page)); BUG_ON(mapping != page_mapping(page)); - xa_lock_irqsave(&mapping->i_pages, flags); + xa_lock_irq(&mapping->i_pages); /* * The non racy check for a busy page. * @@ -1100,7 +1099,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page, if (reclaimed && !mapping_exiting(mapping)) shadow = workingset_eviction(page, target_memcg); __delete_from_swap_cache(page, swap, shadow); - xa_unlock_irqrestore(&mapping->i_pages, flags); + xa_unlock_irq(&mapping->i_pages); put_swap_page(page, swap); } else { void (*freepage)(struct page *); @@ -1126,7 +1125,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page, !mapping_exiting(mapping) && !dax_mapping(mapping)) shadow = workingset_eviction(page, target_memcg); __delete_from_page_cache(page, shadow); - xa_unlock_irqrestore(&mapping->i_pages, flags); + xa_unlock_irq(&mapping->i_pages); if (freepage != NULL) freepage(page); @@ -1135,7 +1134,7 @@ static int __remove_mapping(struct address_space *mapping, struct page *page, return 1; cannot_free: - xa_unlock_irqrestore(&mapping->i_pages, flags); + xa_unlock_irq(&mapping->i_pages); return 0; } |