slab, slub, slob: add slab_flags_t
Add sparse-checked slab_flags_t for struct kmem_cache::flags (SLAB_POISON,
etc).
SLAB is bloated temporarily by switching to "unsigned long", but only
temporarily.
Link: http://lkml.kernel.org/r/20171021100225.GA22428@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Acked-by: Pekka Enberg <penberg@kernel.org>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/include/linux/slab.h b/include/linux/slab.h
index af5aa65..0c4c579 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -21,13 +21,20 @@
* Flags to pass to kmem_cache_create().
* The ones marked DEBUG are only valid if CONFIG_DEBUG_SLAB is set.
*/
-#define SLAB_CONSISTENCY_CHECKS 0x00000100UL /* DEBUG: Perform (expensive) checks on alloc/free */
-#define SLAB_RED_ZONE 0x00000400UL /* DEBUG: Red zone objs in a cache */
-#define SLAB_POISON 0x00000800UL /* DEBUG: Poison objects */
-#define SLAB_HWCACHE_ALIGN 0x00002000UL /* Align objs on cache lines */
-#define SLAB_CACHE_DMA 0x00004000UL /* Use GFP_DMA memory */
-#define SLAB_STORE_USER 0x00010000UL /* DEBUG: Store the last owner for bug hunting */
-#define SLAB_PANIC 0x00040000UL /* Panic if kmem_cache_create() fails */
+/* DEBUG: Perform (expensive) checks on alloc/free */
+#define SLAB_CONSISTENCY_CHECKS ((slab_flags_t __force)0x00000100UL)
+/* DEBUG: Red zone objs in a cache */
+#define SLAB_RED_ZONE ((slab_flags_t __force)0x00000400UL)
+/* DEBUG: Poison objects */
+#define SLAB_POISON ((slab_flags_t __force)0x00000800UL)
+/* Align objs on cache lines */
+#define SLAB_HWCACHE_ALIGN ((slab_flags_t __force)0x00002000UL)
+/* Use GFP_DMA memory */
+#define SLAB_CACHE_DMA ((slab_flags_t __force)0x00004000UL)
+/* DEBUG: Store the last owner for bug hunting */
+#define SLAB_STORE_USER ((slab_flags_t __force)0x00010000UL)
+/* Panic if kmem_cache_create() fails */
+#define SLAB_PANIC ((slab_flags_t __force)0x00040000UL)
/*
* SLAB_TYPESAFE_BY_RCU - **WARNING** READ THIS!
*
@@ -65,44 +72,51 @@
*
* Note that SLAB_TYPESAFE_BY_RCU was originally named SLAB_DESTROY_BY_RCU.
*/
-#define SLAB_TYPESAFE_BY_RCU 0x00080000UL /* Defer freeing slabs to RCU */
-#define SLAB_MEM_SPREAD 0x00100000UL /* Spread some memory over cpuset */
-#define SLAB_TRACE 0x00200000UL /* Trace allocations and frees */
+/* Defer freeing slabs to RCU */
+#define SLAB_TYPESAFE_BY_RCU ((slab_flags_t __force)0x00080000UL)
+/* Spread some memory over cpuset */
+#define SLAB_MEM_SPREAD ((slab_flags_t __force)0x00100000UL)
+/* Trace allocations and frees */
+#define SLAB_TRACE ((slab_flags_t __force)0x00200000UL)
/* Flag to prevent checks on free */
#ifdef CONFIG_DEBUG_OBJECTS
-# define SLAB_DEBUG_OBJECTS 0x00400000UL
+# define SLAB_DEBUG_OBJECTS ((slab_flags_t __force)0x00400000UL)
#else
-# define SLAB_DEBUG_OBJECTS 0x00000000UL
+# define SLAB_DEBUG_OBJECTS ((slab_flags_t __force)0x00000000UL)
#endif
-#define SLAB_NOLEAKTRACE 0x00800000UL /* Avoid kmemleak tracing */
+/* Avoid kmemleak tracing */
+#define SLAB_NOLEAKTRACE ((slab_flags_t __force)0x00800000UL)
/* Don't track use of uninitialized memory */
#ifdef CONFIG_KMEMCHECK
-# define SLAB_NOTRACK 0x01000000UL
+# define SLAB_NOTRACK ((slab_flags_t __force)0x01000000UL)
#else
-# define SLAB_NOTRACK 0x00000000UL
+# define SLAB_NOTRACK ((slab_flags_t __force)0x00000000UL)
#endif
+/* Fault injection mark */
#ifdef CONFIG_FAILSLAB
-# define SLAB_FAILSLAB 0x02000000UL /* Fault injection mark */
+# define SLAB_FAILSLAB ((slab_flags_t __force)0x02000000UL)
#else
-# define SLAB_FAILSLAB 0x00000000UL
+# define SLAB_FAILSLAB ((slab_flags_t __force)0x00000000UL)
#endif
+/* Account to memcg */
#if defined(CONFIG_MEMCG) && !defined(CONFIG_SLOB)
-# define SLAB_ACCOUNT 0x04000000UL /* Account to memcg */
+# define SLAB_ACCOUNT ((slab_flags_t __force)0x04000000UL)
#else
-# define SLAB_ACCOUNT 0x00000000UL
+# define SLAB_ACCOUNT ((slab_flags_t __force)0x00000000UL)
#endif
#ifdef CONFIG_KASAN
-#define SLAB_KASAN 0x08000000UL
+#define SLAB_KASAN ((slab_flags_t __force)0x08000000UL)
#else
-#define SLAB_KASAN 0x00000000UL
+#define SLAB_KASAN ((slab_flags_t __force)0x00000000UL)
#endif
/* The following flags affect the page allocator grouping pages by mobility */
-#define SLAB_RECLAIM_ACCOUNT 0x00020000UL /* Objects are reclaimable */
+/* Objects are reclaimable */
+#define SLAB_RECLAIM_ACCOUNT ((slab_flags_t __force)0x00020000UL)
#define SLAB_TEMPORARY SLAB_RECLAIM_ACCOUNT /* Objects are short-lived */
/*
* ZERO_SIZE_PTR will be returned for zero sized kmalloc requests.
@@ -128,7 +142,7 @@ void __init kmem_cache_init(void);
bool slab_is_available(void);
struct kmem_cache *kmem_cache_create(const char *, size_t, size_t,
- unsigned long,
+ slab_flags_t,
void (*)(void *));
void kmem_cache_destroy(struct kmem_cache *);
int kmem_cache_shrink(struct kmem_cache *);