[PATCH v3 2/2] posix: Implement preadv2 and pwritev2

[H.J. Lu]

On Sat, Jun 3, 2017 at 1:22 AM, Andreas Schwab <schwab@linux-m68k.org> wrote:
> On Jun 02 2017, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>
>> The x86-64 LO_HI_LONG can't be used for p{readv,writev}{64}v2.  Add a
>> new macro, LO_HI_LONG_FLAGS, to pass the off{64}_t and flags arguments.
>
> Why can't LO_HI_LONG just pass the padding unconditionally on x86_64?
>

To avoid the unnecessary (long) (((uint64_t) (val)) >> 32).

-- 
H.J.