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mm/slab: use compound_head() in page_slab()

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page_slab() contained an open-coded implementation of compound_head().

Replace the duplicated code with a direct call to compound_head().

Link: https://lkml.kernel.org/r/20260227194302.274384-19-kas@kernel.org
Signed-off-by: Kiryl Shutsemau <kas@kernel.org>
Acked-by: David Hildenbrand (Arm) <david@kernel.org>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexandre Ghiti <alex@ghiti.fr>
Cc: Baoquan He <bhe@redhat.com>
Cc: Christoph Lameter <cl@gentwo.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Frank van der Linden <fvdl@google.com>
Cc: Harry Yoo <harry.yoo@oracle.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Cc: Usama Arif <usamaarif642@gmail.com>
Cc: WANG Xuerui <kernel@xen0n.name>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Kiryl Shutsemau 2026-02-27 19:42:56 +00:00 committed by Andrew Morton
parent fed8676ca2
commit 8231e4c040
1 changed files with 1 additions and 13 deletions
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14
mm/slab.h
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@ -131,19 +131,7 @@ static_assert(IS_ALIGNED(offsetof(struct slab, freelist), sizeof(struct freelist
*/
static inline struct slab *page_slab(const struct page *page)
{
unsigned long info;
info = READ_ONCE(page->compound_info);
if (info & 1) {
/* See compound_head() */
if (compound_info_has_mask()) {
unsigned long p = (unsigned long)page;
page = (struct page *)(p & info);
} else {
page = (struct page *)(info - 1);
}
}
page = compound_head(page);
if (data_race(page->page_type >> 24) != PGTY_slab)
page = NULL;