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slab fix for 6.18-rc7 

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Merge tag 'slab-for-6.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

Pull slab fix from Vlastimil Babka:

 - Fix mempool poisoning order>0 pages with CONFIG_HIGHMEM (Vlastimil Babka)

* tag 'slab-for-6.18-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab:
  mm/mempool: fix poisoning order>0 pages with HIGHMEM
This commit is contained in:
Linus Torvalds 2025-11-20 10:49:12 -08:00
parent 07e09c3233 ec33b59542
commit c966813ea1
1 changed files with 26 additions and 6 deletions
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32
mm/mempool.c
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@ -68,10 +68,20 @@ static void check_element(mempool_t *pool, void *element)
} else if (pool->free == mempool_free_pages) {
/* Mempools backed by page allocator */
int order = (int)(long)pool->pool_data;
void *addr = kmap_local_page((struct page *)element);
__check_element(pool, addr, 1UL << (PAGE_SHIFT + order));
kunmap_local(addr);
#ifdef CONFIG_HIGHMEM
for (int i = 0; i < (1 << order); i++) {
struct page *page = (struct page *)element;
void *addr = kmap_local_page(page + i);
__check_element(pool, addr, PAGE_SIZE);
kunmap_local(addr);
}
#else
void *addr = page_address((struct page *)element);
__check_element(pool, addr, PAGE_SIZE << order);
#endif
}
}
@ -97,10 +107,20 @@ static void poison_element(mempool_t *pool, void *element)
} else if (pool->alloc == mempool_alloc_pages) {
/* Mempools backed by page allocator */
int order = (int)(long)pool->pool_data;
void *addr = kmap_local_page((struct page *)element);
__poison_element(addr, 1UL << (PAGE_SHIFT + order));
kunmap_local(addr);
#ifdef CONFIG_HIGHMEM
for (int i = 0; i < (1 << order); i++) {
struct page *page = (struct page *)element;
void *addr = kmap_local_page(page + i);
__poison_element(addr, PAGE_SIZE);
kunmap_local(addr);
}
#else
void *addr = page_address((struct page *)element);
__poison_element(addr, PAGE_SIZE << order);
#endif
}
}
#else /* CONFIG_SLUB_DEBUG_ON */