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saner typechecking in generic unaligned.h

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Verify that types would match for assignment (under sizeof, so we are safe from
side effects or any code actually getting generated), then explicitly cast
everywhere to the fixed-sized types.  Kills a bunch of bogus warnings about
constants being truncated (gcc, sparse), finds a pile of endianness problems
hidden by old noise (sparse).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Al Viro 2007-07-17 08:49:35 +01:00 committed by Linus Torvalds
parent cc040a8a0e
commit d37c6e1b67
1 changed files with 9 additions and 7 deletions
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16
include/asm-generic/unaligned.h
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@ -18,7 +18,8 @@
#define get_unaligned(ptr) \
__get_unaligned((ptr), sizeof(*(ptr)))
#define put_unaligned(x,ptr) \
__put_unaligned((__u64)(x), (ptr), sizeof(*(ptr)))
((void)sizeof(*(ptr)=(x)),\
__put_unaligned((__force __u64)(x), (ptr), sizeof(*(ptr))))
/*
* This function doesn't actually exist. The idea is that when
@ -95,21 +96,21 @@ static inline void __ustw(__u16 val, __u16 *addr)
default: \
bad_unaligned_access_length(); \
}; \
(__typeof__(*(ptr)))val; \
(__force __typeof__(*(ptr)))val; \
})
#define __put_unaligned(val, ptr, size) \
do { \
({ \
void *__gu_p = ptr; \
switch (size) { \
case 1: \
*(__u8 *)__gu_p = val; \
*(__u8 *)__gu_p = (__force __u8)val; \
break; \
case 2: \
__ustw(val, __gu_p); \
__ustw((__force __u16)val, __gu_p); \
break; \
case 4: \
__ustl(val, __gu_p); \
__ustl((__force __u32)val, __gu_p); \
break; \
case 8: \
__ustq(val, __gu_p); \
@ -117,6 +118,7 @@ do { \
default: \
bad_unaligned_access_length(); \
}; \
} while(0)
(void)0; \
})
#endif /* _ASM_GENERIC_UNALIGNED_H */