From: H.J. Lu <hjl.tools@gmail.com>
Date: Mon, 11 Jul 2016 22:32:10 +0000 (-0700)
Subject: X86-64: Define LO_HI_LONG to skip pos_h [BZ #20349]
X-Git-Tag: glibc-2.24~22
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cf1ad5b3add36790cbf58a3972c492a8f1632929;p=thirdparty%2Fglibc.git

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.
---

diff --git a/ChangeLog b/ChangeLog
index cac942d9800..8ef71cc2948 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2016-07-11  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #20349]
+	* sysdeps/unix/sysv/linux/x86_64/sysdep.h (LO_HI_LONG): New.
+
 2016-07-11  Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
 	[BZ #18707]
diff --git a/sysdeps/unix/sysv/linux/x86_64/sysdep.h b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
index d023d68174d..1a671e18196 100644
--- a/sysdeps/unix/sysv/linux/x86_64/sysdep.h
+++ b/sysdeps/unix/sysv/linux/x86_64/sysdep.h
@@ -385,4 +385,8 @@
 # endif
 #endif
 
+/* How to pass the off{64}_t argument on p{readv,writev}{64}.  */
+#undef LO_HI_LONG
+#define LO_HI_LONG(val) (val)
+
 #endif /* linux/x86_64/sysdep.h */