kasan: update outdated comment

kmalloc_large() was renamed kmalloc_large_noprof() by commit 7bd230a26648
("mm/slab: enable slab allocation tagging for kmalloc and friends"), and
subsequently renamed __kmalloc_large_noprof() by commit a0a44d9175b3 ("mm,
slab: don't wrap internal functions with alloc_hooks()"), making it an
internal implementation detail.

Large kmalloc allocations are now performed through the public kmalloc()
interface directly, making the reference to KMALLOC_MAX_SIZE also stale
(KMALLOC_MAX_CACHE_SIZE would be more accurate).  Remove the references to
kmalloc_large() and KMALLOC_MAX_SIZE, and rephrase the description for
large kmalloc allocations.

Link: https://lkml.kernel.org/r/20260312053812.1365-1-kexinsun@smail.nju.edu.cn
Signed-off-by: Kexin Sun <kexinsun@smail.nju.edu.cn>
Suggested-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Assisted-by: unnamed:deepseek-v3.2 coccinelle
Reviewed-by: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Julia Lawall <julia.lawall@inria.fr>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/kasan.h b/include/linux/kasan.h
index 338a1921a50ad4c2f72e5ea1d9937bfff6af3a33..bf233bde68c7eb9b4d4b7fdbe741acd1d1cd3171 100644 (file)
--- a/include/linux/kasan.h
+++ b/include/linux/kasan.h
@@ -352,8 +352,8 @@ bool __kasan_mempool_poison_object(void *ptr, unsigned long ip);
  * kasan_mempool_unpoison_object().
  *
  * This function operates on all slab allocations including large kmalloc
- * allocations (the ones returned by kmalloc_large() or by kmalloc() with the
- * size > KMALLOC_MAX_SIZE).
+ * allocations (i.e. the ones backed directly by the buddy allocator rather
+ * than kmalloc slab caches).
  *
  * Return: true if the allocation can be safely reused; false otherwise.
  */
@@ -381,8 +381,8 @@ void __kasan_mempool_unpoison_object(void *ptr, size_t size, unsigned long ip);
  * original tags based on the pointer value.
  *
  * This function operates on all slab allocations including large kmalloc
- * allocations (the ones returned by kmalloc_large() or by kmalloc() with the
- * size > KMALLOC_MAX_SIZE).
+ * allocations (i.e. the ones backed directly by the buddy allocator rather
+ * than kmalloc slab caches).
  */
 static __always_inline void kasan_mempool_unpoison_object(void *ptr,
                                                          size_t size)