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mm/slob: Remove unnecessary page_mapcount_reset() function call

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After commit 401fb12c68 ("mm/sl*b: Differentiate struct slab fields by
sl*b implementations"), we can reorder fields of struct slab depending
on slab allocator.

For now, page_mapcount_reset() is called because page->_mapcount and
slab->units have same offset. But this is not necessary for struct slab.
Use unused field for units instead.

Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/r/20211212065241.GA886691@odroid
This commit is contained in:
Hyeonggon Yoo 2021-12-12 06:52:41 +00:00 • committed by Vlastimil Babka
parent c5e97ed154
commit b01af5c0b0
2 changed files with 2 additions and 3 deletions
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4
mm/slab.h
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@ -50,8 +50,8 @@ struct slab {
struct list_head slab_list; struct list_head slab_list;
void *__unused_1; void *__unused_1;
void *freelist; /* first free block */ void *freelist; /* first free block */
void *__unused_2; long units;
int units; unsigned int __unused_2;
#else #else
#error "Unexpected slab allocator configured" #error "Unexpected slab allocator configured"

1
mm/slob.c
View file

@ -404,7 +404,6 @@ static void slob_free(void *block, int size)
clear_slob_page_free(sp); clear_slob_page_free(sp);
spin_unlock_irqrestore(&slob_lock, flags); spin_unlock_irqrestore(&slob_lock, flags);
__folio_clear_slab(slab_folio(sp)); __folio_clear_slab(slab_folio(sp));
page_mapcount_reset(slab_page(sp));
slob_free_pages(b, 0); slob_free_pages(b, 0);
return; return;
} }