diff options
author | Rusty Russell <rusty@rustcorp.com.au> | 2007-05-06 17:51:05 -0400 |
---|---|---|
committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-07 15:13:00 -0400 |
commit | c5e631cf65f4d6875efcd571275436f2964a8b48 (patch) | |
tree | 1aee9d61560ee369b4a2f077a79e37ab868a4b2d /include/linux | |
parent | f34d9d2dcb7f17b64124841345b23adc0843e7a5 (diff) |
ARRAY_SIZE: check for type
We can use a gcc extension to ensure that ARRAY_SIZE() is handed an array,
not a pointer. This is especially important when code is changed from a
fixed array to a pointer. I assume the Intel compiler doesn't support
__builtin_types_compatible_p.
[jdike@addtoit.com: uml: update UML definition of ARRAY_SIZE]
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r-- | include/linux/compiler-gcc.h | 3 | ||||
-rw-r--r-- | include/linux/compiler-intel.h | 3 | ||||
-rw-r--r-- | include/linux/kernel.h | 3 |
3 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h index 9008eabb9c3d..a9f794716a81 100644 --- a/include/linux/compiler-gcc.h +++ b/include/linux/compiler-gcc.h | |||
@@ -22,6 +22,9 @@ | |||
22 | __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ | 22 | __asm__ ("" : "=r"(__ptr) : "0"(ptr)); \ |
23 | (typeof(ptr)) (__ptr + (off)); }) | 23 | (typeof(ptr)) (__ptr + (off)); }) |
24 | 24 | ||
25 | /* &a[0] degrades to a pointer: a different type from an array */ | ||
26 | #define __must_be_array(a) \ | ||
27 | BUILD_BUG_ON_ZERO(__builtin_types_compatible_p(typeof(a), typeof(&a[0]))) | ||
25 | 28 | ||
26 | #define inline inline __attribute__((always_inline)) | 29 | #define inline inline __attribute__((always_inline)) |
27 | #define __inline__ __inline__ __attribute__((always_inline)) | 30 | #define __inline__ __inline__ __attribute__((always_inline)) |
diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h index a436eea43912..b769961e6f23 100644 --- a/include/linux/compiler-intel.h +++ b/include/linux/compiler-intel.h | |||
@@ -21,6 +21,9 @@ | |||
21 | __ptr = (unsigned long) (ptr); \ | 21 | __ptr = (unsigned long) (ptr); \ |
22 | (typeof(ptr)) (__ptr + (off)); }) | 22 | (typeof(ptr)) (__ptr + (off)); }) |
23 | 23 | ||
24 | /* Intel ECC compiler doesn't support __builtin_types_compatible_p() */ | ||
25 | #define __must_be_array(a) 0 | ||
26 | |||
24 | #endif | 27 | #endif |
25 | 28 | ||
26 | #define uninitialized_var(x) x | 29 | #define uninitialized_var(x) x |
diff --git a/include/linux/kernel.h b/include/linux/kernel.h index e2f41b051b12..144b615f3a89 100644 --- a/include/linux/kernel.h +++ b/include/linux/kernel.h | |||
@@ -35,7 +35,8 @@ extern const char linux_proc_banner[]; | |||
35 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) | 35 | #define ALIGN(x,a) __ALIGN_MASK(x,(typeof(x))(a)-1) |
36 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) | 36 | #define __ALIGN_MASK(x,mask) (((x)+(mask))&~(mask)) |
37 | 37 | ||
38 | #define ARRAY_SIZE(x) (sizeof(x) / sizeof((x)[0])) | 38 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr)) |
39 | |||
39 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) | 40 | #define FIELD_SIZEOF(t, f) (sizeof(((t*)0)->f)) |
40 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) | 41 | #define DIV_ROUND_UP(n,d) (((n) + (d) - 1) / (d)) |
41 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) | 42 | #define roundup(x, y) ((((x) + ((y) - 1)) / (y)) * (y)) |