kmemcheck: make bitfield annotations truly no-ops when disabled

It turns out that even zero-sized struct members (int foo[0];) will affect
the struct layout, causing us in particular to lose 4 bytes in struct
sock.

This patch fixes the regression in CONFIG_KMEMCHECK=n case.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 58 insertions, 52 deletions

diff --git a/include/linux/kmemcheck.h b/include/linux/kmemcheck.h
index e880d4cf9e2..08d7dc4ddf4 100644
--- a/include/linux/kmemcheck.h
+++ b/include/linux/kmemcheck.h
@@ -36,6 +36,56 @@ int kmemcheck_hide_addr(unsigned long address);
 
 bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size);
 
+/*
+ * 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);
+ */
+#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 {                                                            \
+                int _n;                                                 \
+                                                                        \
+                if (!ptr)                                               \
+                        break;                                          \
+                                                                        \
+                _n = (long) &((ptr)->name##_end)                        \
+                        - (long) &((ptr)->name##_begin);                \
+                MAYBE_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)                                                     \
+
 #else
 #define kmemcheck_enabled 0
 
@@ -106,60 +156,16 @@ static inline bool kmemcheck_is_obj_initialized(unsigned long addr, size_t size)
         return true;
 }
 
-#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_bitfield_begin(name)
+#define kmemcheck_bitfield_end(name)
+#define kmemcheck_annotate_bitfield(ptr, name)  \
+        do {                                    \
+        } while (0)
 
-#define kmemcheck_annotate_bitfield(ptr, name)                          \
-        do {                                                            \
-                int _n;                                                 \
-                                                                        \
-                if (!ptr)                                               \
-                        break;                                          \
-                                                                        \
-                _n = (long) &((ptr)->name##_end)                        \
-                        - (long) &((ptr)->name##_begin);                \
-                MAYBE_BUILD_BUG_ON(_n < 0);                             \
-                                                                        \
-                kmemcheck_mark_initialized(&((ptr)->name##_begin), _n); \
+#define kmemcheck_annotate_variable(var)        \
+        do {                                    \
         } while (0)
 
-#define kmemcheck_annotate_variable(var)                                \
-        do {                                                            \
-                kmemcheck_mark_initialized(&(var), sizeof(var));        \
-        } while (0)                                                     \
+#endif /* CONFIG_KMEMCHECK */
 
 #endif /* LINUX_KMEMCHECK_H */