Merge tag 'slab-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab

Pull slab updates from Vlastimil Babka:

 - Separate struct slab from struct page - an offshot of the page folio
   work.

   Struct page fields used by slab allocators are moved from struct page
   to a new struct slab, that uses the same physical storage. Similar to
   struct folio, it always is a head page. This brings better type
   safety, separation of large kmalloc allocations from true slabs, and
   cleanup of related objcg code.

 - A SLAB_MERGE_DEFAULT config optimization.

* tag 'slab-for-5.17' of git://git.kernel.org/pub/scm/linux/kernel/git/vbabka/slab: (33 commits)
  mm/slob: Remove unnecessary page_mapcount_reset() function call
  bootmem: Use page->index instead of page->freelist
  zsmalloc: Stop using slab fields in struct page
  mm/slub: Define struct slab fields for CONFIG_SLUB_CPU_PARTIAL only when enabled
  mm/slub: Simplify struct slab slabs field definition
  mm/sl*b: Differentiate struct slab fields by sl*b implementations
  mm/kfence: Convert kfence_guarded_alloc() to struct slab
  mm/kasan: Convert to struct folio and struct slab
  mm/slob: Convert SLOB to use struct slab and struct folio
  mm/memcg: Convert slab objcgs from struct page to struct slab
  mm: Convert struct page to struct slab in functions used by other subsystems
  mm/slab: Finish struct page to struct slab conversion
  mm/slab: Convert most struct page to struct slab by spatch
  mm/slab: Convert kmem_getpages() and kmem_freepages() to struct slab
  mm/slub: Finish struct page to struct slab conversion
  mm/slub: Convert most struct page to struct slab by spatch
  mm/slub: Convert pfmemalloc_match() to take a struct slab
  mm/slub: Convert __free_slab() to use struct slab
  mm/slub: Convert alloc_slab_page() to return a struct slab
  mm/slub: Convert print_page_info() to print_slab_info()
  ...

1 files changed, 11 insertions, 2 deletions

diff --git a/mm/kasan/report.c b/mm/kasan/report.c
index 0bc10f452f7e..3ad9624dcc56 100644
--- a/mm/kasan/report.c
+++ b/mm/kasan/report.c
@@ -150,6 +150,14 @@ struct page *kasan_addr_to_page(const void *addr)
 	return NULL;
 }
 
+struct slab *kasan_addr_to_slab(const void *addr)
+{
+	if ((addr >= (void *)PAGE_OFFSET) &&
+			(addr < high_memory))
+		return virt_to_slab(addr);
+	return NULL;
+}
+
 static void describe_object_addr(struct kmem_cache *cache, void *object,
 				const void *addr)
 {
@@ -248,8 +256,9 @@ static void print_address_description(void *addr, u8 tag)
 	pr_err("\n");
 
 	if (page && PageSlab(page)) {
-		struct kmem_cache *cache = page->slab_cache;
-		void *object = nearest_obj(cache, page,	addr);
+		struct slab *slab = page_slab(page);
+		struct kmem_cache *cache = slab->slab_cache;
+		void *object = nearest_obj(cache, slab,	addr);
 
 		describe_object(cache, object, addr, tag);
 	}