Now that SLAB passes large requests to page allocator like SLUB,
Unify __ksize(). Only SLOB need to implement own version of __ksize()
because it stores size in object header for kmalloc objects.
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>
---
mm/slab.c | 30 ------------------------------
mm/slab_common.c | 27 +++++++++++++++++++++++++++
mm/slub.c | 16 ----------------
3 files changed, 27 insertions(+), 46 deletions(-)
diff --git a/mm/slab.c b/mm/slab.c
index 570af6dc3478..3ddf2181d8e4 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -4216,33 +4216,3 @@ void __check_heap_object(const void *ptr, unsigned long n,
usercopy_abort("SLAB object", cachep->name, to_user, offset, n);
}
#endif /* CONFIG_HARDENED_USERCOPY */
-
-/**
- * __ksize -- Uninstrumented ksize.
- * @objp: pointer to the object
- *
- * Unlike ksize(), __ksize() is uninstrumented, and does not provide the same
- * safety checks as ksize() with KASAN instrumentation enabled.
- *
- * Return: size of the actual memory used by @objp in bytes
- */
-size_t __ksize(const void *objp)
-{
- struct kmem_cache *c;
- struct folio *folio;
- size_t size;
-
- BUG_ON(!objp);
- if (unlikely(objp == ZERO_SIZE_PTR))
- return 0;
-
- folio = virt_to_folio(objp);
- if (!folio_test_slab(folio))
- return folio_size(folio);
-
- c = virt_to_cache(objp);
- size = c ? c->object_size : 0;
-
- return size;
-}
-EXPORT_SYMBOL(__ksize);
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 23f2ab0713b7..1d2f92e871d2 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -1245,6 +1245,33 @@ void kfree_sensitive(const void *p)
}
EXPORT_SYMBOL(kfree_sensitive);
+#ifndef CONFIG_SLOB
+/**
+ * __ksize -- Uninstrumented ksize.
+ * @objp: pointer to the object
+ *
+ * Unlike ksize(), __ksize() is uninstrumented, and does not provide the same
+ * safety checks as ksize() with KASAN instrumentation enabled.
+ *
+ * Return: size of the actual memory used by @objp in bytes
+ */
+size_t __ksize(const void *object)
+{
+ struct folio *folio;
+
+ if (unlikely(object == ZERO_SIZE_PTR))
+ return 0;
+
+ folio = virt_to_folio(object);
+
+ if (unlikely(!folio_test_slab(folio)))
+ return folio_size(folio);
+
+ return slab_ksize(folio_slab(folio)->slab_cache);
+}
+EXPORT_SYMBOL(__ksize);
+#endif
+
/**
* ksize - get the actual amount of memory allocated for a given object
* @objp: Pointer to the object
diff --git a/mm/slub.c b/mm/slub.c
index 04fd084f4709..6f0ebadd8f30 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -4507,22 +4507,6 @@ void __check_heap_object(const void *ptr, unsigned long n,
}
#endif /* CONFIG_HARDENED_USERCOPY */
-size_t __ksize(const void *object)
-{
- struct folio *folio;
-
- if (unlikely(object == ZERO_SIZE_PTR))
- return 0;
-
- folio = virt_to_folio(object);
-
- if (unlikely(!folio_test_slab(folio)))
- return folio_size(folio);
-
- return slab_ksize(folio_slab(folio)->slab_cache);
-}
-EXPORT_SYMBOL(__ksize);
-
void kfree(const void *x)
{
struct folio *folio;
--
2.33.1
