slab: add a flag to prevent debug_free checks on a kmem_cache

This is a preperatory patch for the debugobjects infrastructure.  The flag
prevents debug_free checks on kmem_caches.  This is necessary to avoid
resursive calls into a debug mechanism which uses a kmem_cache itself.

Signed-off-by: Thomas Gleixner <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: Christoph Lameter <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

diff --git a/include/linux/slab.h b/include/linux/slab.h
index f62caaad94e00876d7877c8cb738c95f5e61021c..6d03c954f6411f751a10c07647eb2593ad603ad2 100644 (file)
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -29,6 +29,13 @@
 #define SLAB_MEM_SPREAD                0x00100000UL    /* Spread some memory over cpuset */
 #define SLAB_TRACE             0x00200000UL    /* Trace allocations and frees */
 
+/* Flag to prevent checks on free */
+#ifdef CONFIG_DEBUG_OBJECTS
+# define SLAB_DEBUG_OBJECTS    0x00400000UL
+#else
+# define SLAB_DEBUG_OBJECTS    0x00000000UL
+#endif
+
 /* The following flags affect the page allocator grouping pages by mobility */
 #define SLAB_RECLAIM_ACCOUNT   0x00020000UL            /* Objects are reclaimable */
 #define SLAB_TEMPORARY         SLAB_RECLAIM_ACCOUNT    /* Objects are short-lived */