1 files changed, 153 insertions, 0 deletions
diff --git a/include/linux/kmemcheck.h b/include/linux/kmemcheck.h
new file mode 100644
index 000000000000..47b39b7c7e84
--- /dev/null
+++ b/include/linux/kmemcheck.h
@@ -0,0 +1,153 @@
+#ifndef LINUX_KMEMCHECK_H
+#define LINUX_KMEMCHECK_H
+
+#include <linux/mm_types.h>
+#include <linux/types.h>
+
+#ifdef CONFIG_KMEMCHECK
+extern int kmemcheck_enabled;
+
+/* The slab-related functions. */
+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);
+
+bool kmemcheck_page_is_tracked(struct page *p);
+
+void kmemcheck_mark_unallocated(void *address, unsigned int n);
+void kmemcheck_mark_uninitialized(void *address, unsigned int n);
+void kmemcheck_mark_initialized(void *address, unsigned int n);
+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 page *page, int order, gfp_t flags, int node)
+{
+}
+
+static inline void
+kmemcheck_free_shadow(struct page *page, int order)
+{
+}
+
+static inline void
+kmemcheck_slab_alloc(struct kmem_cache *s, gfp_t gfpflags, void *object,
+		     size_t size)
+{
+}
+
+static inline void kmemcheck_slab_free(struct kmem_cache *s, void *object,
+				       size_t size)
+{
+}
+
+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;
+}
+
+static inline void kmemcheck_mark_unallocated(void *address, unsigned int n)
+{
+}
+
+static inline void kmemcheck_mark_uninitialized(void *address, unsigned int n)
+{
+}
+
+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 */