Messages in this thread | | | From | Arnd Bergmann <> | Subject | Re: [COMPAT] Add compat_merge64 helper | Date | Sat, 29 Sep 2007 01:38:23 +0200 |
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On Saturday 29 September 2007, you wrote: > +static inline u64 compat_merge64(u32 left, u32 right) > +{ > +#if defined(__BIG_ENDIAN) > + return ((u64)left << 32) | right; > +#else /* defined (__LITTLE_ENDIAN) */ > + return ((u64)right << 32) | left; > +#endif > +}
Looks good, if we can guarantee that
1. Byte order matches the order in which 64 bit arguments are split in system call conventions on all platforms. 2. Every user of compat_merge64() includes asm/byteorder.h
Both should be easy to prove, but I'm not convinced until someone actually does it.
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