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Message-ID: <20070726164619.GO27237@ftp.linux.org.uk>
Date: Thu, 26 Jul 2007 17:46:19 +0100
From: Al Viro <viro@....linux.org.uk>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: rmk@....linux.org.uk, linux-kernel@...r.kernel.org
Subject: [PATCH] arm unaligned.h annotations
Have put_unaligned() warn if types would be wrong
for assignment, slap force-casts where needed. Cast the
result of get_unaligned to typeof(*ptr). With that in
place we get proper typechecking, both from gcc and from sparse,
including that for bitwise types.
Signed-off-by: Al Viro <viro@...iv.linux.org.uk>
---
diff --git a/include/asm-arm/unaligned.h b/include/asm-arm/unaligned.h
index 795b9e5..8431f6e 100644
--- a/include/asm-arm/unaligned.h
+++ b/include/asm-arm/unaligned.h
@@ -60,24 +60,24 @@ extern int __bug_unaligned_x(const void *ptr);
__get_unaligned_4_be((__p+4)))
#define __get_unaligned_le(ptr) \
- ({ \
+ ((__force typeof(*(ptr)))({ \
const __u8 *__p = (const __u8 *)(ptr); \
__builtin_choose_expr(sizeof(*(ptr)) == 1, *__p, \
__builtin_choose_expr(sizeof(*(ptr)) == 2, __get_unaligned_2_le(__p), \
__builtin_choose_expr(sizeof(*(ptr)) == 4, __get_unaligned_4_le(__p), \
__builtin_choose_expr(sizeof(*(ptr)) == 8, __get_unaligned_8_le(__p), \
(void)__bug_unaligned_x(__p))))); \
- })
+ }))
#define __get_unaligned_be(ptr) \
- ({ \
+ ((__force typeof(*(ptr)))({ \
const __u8 *__p = (const __u8 *)(ptr); \
__builtin_choose_expr(sizeof(*(ptr)) == 1, *__p, \
__builtin_choose_expr(sizeof(*(ptr)) == 2, __get_unaligned_2_be(__p), \
__builtin_choose_expr(sizeof(*(ptr)) == 4, __get_unaligned_4_be(__p), \
__builtin_choose_expr(sizeof(*(ptr)) == 8, __get_unaligned_8_be(__p), \
(void)__bug_unaligned_x(__p))))); \
- })
+ }))
static inline void __put_unaligned_2_le(__u32 __v, register __u8 *__p)
@@ -131,15 +131,16 @@ static inline void __put_unaligned_8_be(const unsigned long long __v, register _
*/
#define __put_unaligned_le(val,ptr) \
({ \
+ (void)sizeof(*(ptr) = (val)); \
switch (sizeof(*(ptr))) { \
case 1: \
*(ptr) = (val); \
break; \
- case 2: __put_unaligned_2_le((val),(__u8 *)(ptr)); \
+ case 2: __put_unaligned_2_le((__force u16)(val),(__u8 *)(ptr)); \
break; \
- case 4: __put_unaligned_4_le((val),(__u8 *)(ptr)); \
+ case 4: __put_unaligned_4_le((__force u32)(val),(__u8 *)(ptr)); \
break; \
- case 8: __put_unaligned_8_le((val),(__u8 *)(ptr)); \
+ case 8: __put_unaligned_8_le((__force u64)(val),(__u8 *)(ptr)); \
break; \
default: __bug_unaligned_x(ptr); \
break; \
@@ -149,15 +150,16 @@ static inline void __put_unaligned_8_be(const unsigned long long __v, register _
#define __put_unaligned_be(val,ptr) \
({ \
+ (void)sizeof(*(ptr) = (val)); \
switch (sizeof(*(ptr))) { \
case 1: \
*(ptr) = (val); \
break; \
- case 2: __put_unaligned_2_be((val),(__u8 *)(ptr)); \
+ case 2: __put_unaligned_2_be((__force u16)(val),(__u8 *)(ptr)); \
break; \
- case 4: __put_unaligned_4_be((val),(__u8 *)(ptr)); \
+ case 4: __put_unaligned_4_be((__force u32)(val),(__u8 *)(ptr)); \
break; \
- case 8: __put_unaligned_8_be((val),(__u8 *)(ptr)); \
+ case 8: __put_unaligned_8_be((__force u64)(val),(__u8 *)(ptr)); \
break; \
default: __bug_unaligned_x(ptr); \
break; \
-
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