From: Al Viro Date: Tue, 17 Jul 2007 07:49:35 +0000 (+0100) Subject: saner typechecking in generic unaligned.h X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=d37c6e1b67e8d7f3c5fceba491dcb09a15cb7772;p=linux-beck.git saner typechecking in generic unaligned.h 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 Signed-off-by: Linus Torvalds --- diff --git a/include/asm-generic/unaligned.h b/include/asm-generic/unaligned.h index 09ec447fe2af..16a466e50681 100644 --- a/include/asm-generic/unaligned.h +++ b/include/asm-generic/unaligned.h @@ -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 */