Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6

[deliverable/linux.git] / include / linux / kmemcheck.h

diff --git a/include/linux/kmemcheck.h b/include/linux/kmemcheck.h
index 71f21ae33d1df54002ae12f2b20ba8deddf7dacb..47b39b7c7e849189a9115c7669181c8f4f4714bd 100644 (file)
--- a/include/linux/kmemcheck.h
+++ b/include/linux/kmemcheck.h
@@ -8,13 +8,15 @@
 extern int kmemcheck_enabled;
 
 /* The slab-related functions. */
-void kmemcheck_alloc_shadow(struct kmem_cache *s, gfp_t flags, int node,
-                           struct page *page, int order);
-void kmemcheck_free_shadow(struct kmem_cache *s, struct page *page, int order);
+void kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node);
+void kmemcheck_free_shadow(struct page *page, int order);
 void kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
                          size_t size);
 void kmemcheck_slab_free(struct kmem_cache *s, void *object, size_t size);
 
+void kmemcheck_pagealloc_alloc(struct page *p, unsigned int order,
+                              gfp_t gfpflags);
+
 void kmemcheck_show_pages(struct page *p, unsigned int n);
 void kmemcheck_hide_pages(struct page *p, unsigned int n);
 
@@ -27,20 +29,21 @@ void kmemcheck_mark_freed(void *address, unsigned int n);
 
 void kmemcheck_mark_unallocated_pages(struct page *p, unsigned int n);
 void kmemcheck_mark_uninitialized_pages(struct page *p, unsigned int n);
+void kmemcheck_mark_initialized_pages(struct page *p, unsigned int n);
 
 int kmemcheck_show_addr(unsigned long address);
 int kmemcheck_hide_addr(unsigned long address);
+
 #else
 #define kmemcheck_enabled 0
 
 static inline void
-kmemcheck_alloc_shadow(struct kmem_cache *s, gfp_t flags, int node,
-                      struct page *page, int order)
+kmemcheck_alloc_shadow(struct page *page, int order, gfp_t flags, int node)
 {
 }
 
 static inline void
-kmemcheck_free_shadow(struct kmem_cache *s, struct page *page, int order)
+kmemcheck_free_shadow(struct page *page, int order)
 {
 }
 
@@ -55,6 +58,11 @@ static inline void kmemcheck_slab_free(struct kmem_cache *s, void *object,
 {
 }
 
+static inline void kmemcheck_pagealloc_alloc(struct page *p,
+       unsigned int order, gfp_t gfpflags)
+{
+}
+
 static inline bool kmemcheck_page_is_tracked(struct page *p)
 {
        return false;
@@ -75,6 +83,71 @@ static inline void kmemcheck_mark_initialized(void *address, unsigned int n)
 static inline void kmemcheck_mark_freed(void *address, unsigned int n)
 {
 }
+
+static inline void kmemcheck_mark_unallocated_pages(struct page *p,
+                                                   unsigned int n)
+{
+}
+
+static inline void kmemcheck_mark_uninitialized_pages(struct page *p,
+                                                     unsigned int n)
+{
+}
+
+static inline void kmemcheck_mark_initialized_pages(struct page *p,
+                                                   unsigned int n)
+{
+}
+
 #endif /* CONFIG_KMEMCHECK */
 
+/*
+ * Bitfield annotations
+ *
+ * How to use: If you have a struct using bitfields, for example
+ *
+ *     struct a {
+ *             int x:8, y:8;
+ *     };
+ *
+ * then this should be rewritten as
+ *
+ *     struct a {
+ *             kmemcheck_bitfield_begin(flags);
+ *             int x:8, y:8;
+ *             kmemcheck_bitfield_end(flags);
+ *     };
+ *
+ * Now the "flags_begin" and "flags_end" members may be used to refer to the
+ * beginning and end, respectively, of the bitfield (and things like
+ * &x.flags_begin is allowed). As soon as the struct is allocated, the bit-
+ * fields should be annotated:
+ *
+ *     struct a *a = kmalloc(sizeof(struct a), GFP_KERNEL);
+ *     kmemcheck_annotate_bitfield(a, flags);
+ *
+ * Note: We provide the same definitions for both kmemcheck and non-
+ * kmemcheck kernels. This makes it harder to introduce accidental errors. It
+ * is also allowed to pass NULL pointers to kmemcheck_annotate_bitfield().
+ */
+#define kmemcheck_bitfield_begin(name) \
+       int name##_begin[0];
+
+#define kmemcheck_bitfield_end(name)   \
+       int name##_end[0];
+
+#define kmemcheck_annotate_bitfield(ptr, name)                         \
+       do if (ptr) {                                                   \
+               int _n = (long) &((ptr)->name##_end)                    \
+                       - (long) &((ptr)->name##_begin);                \
+               BUILD_BUG_ON(_n < 0);                                   \
+                                                                       \
+               kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \
+       } while (0)
+
+#define kmemcheck_annotate_variable(var)                               \
+       do {                                                            \
+               kmemcheck_mark_initialized(&(var), sizeof(var));        \
+       } while (0)                                                     \
+
 #endif /* LINUX_KMEMCHECK_H */