[Bug libc/20349] 64-bit value is passed differently in p{readv,writev}{64}

["cvs-commit at gcc dot gnu.org" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20349

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https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=cf1ad5b3add36790cbf58a3972c492a8f1632929

commit cf1ad5b3add36790cbf58a3972c492a8f1632929
Author: H.J. Lu <hjl.tools@gmail.com>
Date:   Mon Jul 11 15:32:10 2016 -0700

    X86-64: Define LO_HI_LONG to skip pos_h [BZ #20349]

    Define LO_HI_LONG to skip pos_h since it is ignored by kernel:

    static inline loff_t pos_from_hilo(unsigned long high, unsigned long low)
    {
     #define HALF_LONG_BITS (BITS_PER_LONG / 2)
            return (((loff_t)high << HALF_LONG_BITS) << HALF_LONG_BITS) | low;
    }

    where size of loff_t == size of long.

        [BZ #20349]
        * sysdeps/unix/sysv/linux/x86_64/sysdep.h (LO_HI_LONG): New.

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                               |    5 +++++
 sysdeps/unix/sysv/linux/x86_64/sysdep.h |    4 ++++
 2 files changed, 9 insertions(+), 0 deletions(-)

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