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since been replaced by memcg taking the page lock instead, commit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>
diff --git a/mm/filemap.c b/mm/filemap.c
index d1458ec..4926f16 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -258,12 +258,11 @@ static void page_cache_free_page(struct address_space *mapping,
void delete_from_page_cache(struct page *page)
{
struct address_space *mapping = page_mapping(page);
- unsigned long flags;
BUG_ON(!PageLocked(page));
- xa_lock_irqsave(&mapping->i_pages, flags);
+ xa_lock_irq(&mapping->i_pages);
__delete_from_page_cache(page, NULL);
- xa_unlock_irqrestore(&mapping->i_pages, flags);
+ xa_unlock_irq(&mapping->i_pages);
page_cache_free_page(mapping, page);
}
@@ -335,19 +334,18 @@ void delete_from_page_cache_batch(struct address_space *mapping,
struct pagevec *pvec)
{
int i;
- unsigned long flags;
if (!pagevec_count(pvec))
return;
- xa_lock_irqsave(&mapping->i_pages, flags);
+ xa_lock_irq(&mapping->i_pages);
for (i = 0; i < pagevec_count(pvec); i++) {
trace_mm_filemap_delete_from_page_cache(pvec->pages[i]);
unaccount_page_cache_page(mapping, pvec->pages[i]);
}
page_cache_delete_batch(mapping, pvec);
- xa_unlock_irqrestore(&mapping->i_pages, flags);
+ xa_unlock_irq(&mapping->i_pages);
for (i = 0; i < pagevec_count(pvec); i++)
page_cache_free_page(mapping, pvec->pages[i]);
@@ -821,7 +819,6 @@ void replace_page_cache_page(struct page *old, struct page *new)
void (*freepage)(struct page *) = mapping->a_ops->freepage;
pgoff_t offset = old->index;
XA_STATE(xas, &mapping->i_pages, offset);
- unsigned long flags;
VM_BUG_ON_PAGE(!PageLocked(old), old);
VM_BUG_ON_PAGE(!PageLocked(new), new);
@@ -833,7 +830,7 @@ void replace_page_cache_page(struct page *old, struct page *new)
mem_cgroup_migrate(old, new);
- xas_lock_irqsave(&xas, flags);
+ xas_lock_irq(&xas);
xas_store(&xas, new);
old->mapping = NULL;
@@ -846,7 +843,7 @@ void replace_page_cache_page(struct page *old, struct page *new)
__dec_lruvec_page_state(old, NR_SHMEM);
if (PageSwapBacked(new))
__inc_lruvec_page_state(new, NR_SHMEM);
- xas_unlock_irqrestore(&xas, flags);
+ xas_unlock_irq(&xas);
if (freepage)
freepage(old);
put_page(old);