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kasan: Remove references to folio in __kasan_mempool_poison_object()

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In preparation for splitting struct slab from struct page and struct
folio, remove mentions of struct folio from this function.  There is a
mild improvement for large kmalloc objects as we will avoid calling
compound_head() for them.  We can discard the comment as using
PageLargeKmalloc() rather than !folio_test_slab() makes it obvious.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Cc: kasan-dev <kasan-dev@googlegroups.com>
Link: https://patch.msgid.link/20251113000932.1589073-16-willy@infradead.org
Acked-by: Harry Yoo <harry.yoo@oracle.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Matthew Wilcox (Oracle)
2025-11-13 00:09:29 +00:00
committed by Vlastimil Babka
parent b8557d109e
commit bbe7117305
1 changed files with 4 additions and 8 deletions
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12
mm/kasan/common.c
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@@ -520,24 +520,20 @@ void __kasan_mempool_unpoison_pages(struct page *page, unsigned int order,
bool __kasan_mempool_poison_object(void *ptr, unsigned long ip)
{
struct folio *folio = virt_to_folio(ptr);
struct page *page = virt_to_page(ptr);
struct slab *slab;
/*
* This function can be called for large kmalloc allocation that get
* their memory from page_alloc. Thus, the folio might not be a slab.
*/
if (unlikely(!folio_test_slab(folio))) {
if (unlikely(PageLargeKmalloc(page))) {
if (check_page_allocation(ptr, ip))
return false;
kasan_poison(ptr, folio_size(folio), KASAN_PAGE_FREE, false);
kasan_poison(ptr, page_size(page), KASAN_PAGE_FREE, false);
return true;
}
if (is_kfence_address(ptr))
return true;
slab = folio_slab(folio);
slab = page_slab(page);
if (check_slab_allocation(slab->slab_cache, ptr, ip))
return false;