On Monday 19 October 2015 09:34:15 Geert Uytterhoeven wrote: > On Wed, Oct 7, 2015 at 1:23 PM, Arnd Bergmann <arnd@xxxxxxxx> wrote: > > static __inline__ int atomic64_add_unless(atomic64_t *v, long a, long u) > > > > which truncates the result to 32 bit. > > Woops. > > See also my unanswered question in "atomic64 on 32-bit vs 64-bit (was: > Re: Add virtio gpu driver.)", which is still valid: > https://lkml.org/lkml/2015/6/28/18 > Regarding your question of > Instead of sprinkling casts, is there any good reason why atomic64_read() > and atomic64_t aren't "long long" everywhere, cfr. u64? I assume the answer is that some (all?) 64-bit architectures intentionally return 'long' here, in order for atomic_long_read() to return 'long' on all architectures, given the definitions from include/asm-generic/atomic-long.h We would have to either change those, or we have to pick between atomic_long_* or atomic64_* to have a consistent return type. Arnd _______________________________________________ Virtualization mailing list Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linuxfoundation.org/mailman/listinfo/virtualization
