Remove __ASSUME_OFF_DIFF_OFF64 definition

This patch removes the __ASSUME_OFF_DIFF_OFF64 define introduced in
p{read,write} consolidation patch.  This define was added based on
the idea 32 bits ports would continue to follow previous off{64}_t
definition where off_t size differs from off64_t one.

However, with recent AArch64/ILP32 patch submission and also with
discussion for RISCV kernel interface, 32 bits ports now may aim
to use off_t and off64_t with the same size as 64 bits.

So current assumption for both p{read,write} and p{read,write}v
are not compatible with new type definition.  This patch now makes
the syscall wrappers to only depend on __OFF_T_MATCHES_OFF64_T to
define the default and 64-suffix variant, as follow:

  <function>.c
  #ifndef __OFF_T_MATCHES_OFF64_T
  /* build <function> */
  #endif

  and

  <function>64.c

  /* build <function>64 */
  #ifdef __OFF_T_MATCHES_OFF64_T
  weak_alias (fallocate64, fallocate)
  #endif

Tested on x86_64, i686, x32, and armhf.

	* sysdeps/unix/sysv/linux/mips/kernel-features.h
	(__ASSUME_OFF_DIFF_OFF64): Remove define.
	* sysdeps/unix/sysv/linux/pread.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pread): Replace by
	__OFF_T_MATCHES_OFF64_T.
	* sysdeps/unix/sysv/linux/pread64.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pread64): Likewise.
	* sysdeps/unix/sysv/linux/preadv.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (preadv): Likewise.
	* sysdeps/unix/sysv/linux/preadv64.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (preadv64): Likewise.
	* sysdeps/unix/sysv/linux/pwrite.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pwrite): Likewise.
	* sysdeps/unix/sysv/linux/pwrite64.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pwrite64): Likewise.
	* sysdeps/unix/sysv/linux/pwritev.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pwritev): Likewise.
	* sysdeps/unix/sysv/linux/pwritev64.c
	[__WORDSIZE != 64 || __ASSUME_OFF_DIFF_OFF64] (pwritev64): Likewise.

9 files changed, 8 insertions, 9 deletions

diff --git a/sysdeps/unix/sysv/linux/mips/kernel-features.h b/sysdeps/unix/sysv/linux/mips/kernel-features.h
index 09d5ecedd8..b486d904c3 100644
--- a/sysdeps/unix/sysv/linux/mips/kernel-features.h
+++ b/sysdeps/unix/sysv/linux/mips/kernel-features.h
@@ -38,5 +38,4 @@
    pass 64-bits values through syscalls.  */
 #if _MIPS_SIM == _ABIN32
 # define __ASSUME_WORDSIZE64_ILP32	1
-# define __ASSUME_OFF_DIFF_OFF64        1
 #endif
diff --git a/sysdeps/unix/sysv/linux/pread.c b/sysdeps/unix/sysv/linux/pread.c
index 566309278a..1bcff64781 100644
--- a/sysdeps/unix/sysv/linux/pread.c
+++ b/sysdeps/unix/sysv/linux/pread.c
@@ -19,7 +19,7 @@
 #include <unistd.h>
 #include <sysdep-cancel.h>
 
-#if __WORDSIZE != 64 || defined (__ASSUME_OFF_DIFF_OFF64)
+#ifndef __OFF_T_MATCHES_OFF64_T
 
 # ifndef __NR_pread
 #  define __NR_pread __NR_pread64
diff --git a/sysdeps/unix/sysv/linux/pread64.c b/sysdeps/unix/sysv/linux/pread64.c
index c599f7664b..58c6aeb541 100644
--- a/sysdeps/unix/sysv/linux/pread64.c
+++ b/sysdeps/unix/sysv/linux/pread64.c
@@ -33,7 +33,7 @@ __libc_pread64 (int fd, void *buf, size_t count, off64_t offset)
 weak_alias (__libc_pread64, __pread64)
 weak_alias (__libc_pread64, pread64)
 
-#if __WORDSIZE == 64 && !defined (__ASSUME_OFF_DIFF_OFF64)
+#ifdef __OFF_T_MATCHES_OFF64_T
 strong_alias (__libc_pread64, __libc_pread)
 weak_alias (__libc_pread64, __pread)
 weak_alias (__libc_pread64, pread)
diff --git a/sysdeps/unix/sysv/linux/preadv.c b/sysdeps/unix/sysv/linux/preadv.c
index be206e277b..107cb818f9 100644
--- a/sysdeps/unix/sysv/linux/preadv.c
+++ b/sysdeps/unix/sysv/linux/preadv.c
@@ -18,7 +18,7 @@
 #include <sys/uio.h>
 #include <sysdep-cancel.h>
 
-#if __WORDSIZE != 64 || defined (__ASSUME_OFF_DIFF_OFF64)
+#ifndef __OFF_T_MATCHES_OFF64_T
 
 # ifdef __ASSUME_PREADV
 
diff --git a/sysdeps/unix/sysv/linux/preadv64.c b/sysdeps/unix/sysv/linux/preadv64.c
index 64164bbe6b..66afd4c82e 100644
--- a/sysdeps/unix/sysv/linux/preadv64.c
+++ b/sysdeps/unix/sysv/linux/preadv64.c
@@ -49,6 +49,6 @@ preadv64 (int fd, const struct iovec *vector, int count, off64_t offset)
 # include <sysdeps/posix/preadv.c>
 #endif
 
-#if __WORDSIZE == 64 && !defined (__ASSUME_OFF_DIFF_OFF64)
+#ifdef __OFF_T_MATCHES_OFF64_T
 strong_alias (preadv64, preadv)
 #endif
diff --git a/sysdeps/unix/sysv/linux/pwrite.c b/sysdeps/unix/sysv/linux/pwrite.c
index ca3014f06d..9c502beac1 100644
--- a/sysdeps/unix/sysv/linux/pwrite.c
+++ b/sysdeps/unix/sysv/linux/pwrite.c
@@ -19,7 +19,7 @@
 #include <unistd.h>
 #include <sysdep-cancel.h>
 
-#if __WORDSIZE != 64 || defined (__ASSUME_OFF_DIFF_OFF64)
+#ifndef __OFF_T_MATCHES_OFF64_T
 
 # ifndef __NR_pwrite
 #  define __NR_pwrite __NR_pwrite64
diff --git a/sysdeps/unix/sysv/linux/pwrite64.c b/sysdeps/unix/sysv/linux/pwrite64.c
index 5a37701848..b49e6bc286 100644
--- a/sysdeps/unix/sysv/linux/pwrite64.c
+++ b/sysdeps/unix/sysv/linux/pwrite64.c
@@ -33,7 +33,7 @@ weak_alias (__libc_pwrite64, __pwrite64)
 libc_hidden_weak (__pwrite64)
 weak_alias (__libc_pwrite64, pwrite64)
 
-#if __WORDSIZE == 64 && !defined (__ASSUME_OFF_DIFF_OFF64)
+#ifdef __OFF_T_MATCHES_OFF64_T
 strong_alias (__libc_pwrite64, __libc_pwrite)
 weak_alias (__libc_pwrite64, __pwrite)
 weak_alias (__libc_pwrite64, pwrite)
diff --git a/sysdeps/unix/sysv/linux/pwritev.c b/sysdeps/unix/sysv/linux/pwritev.c
index 19b4a109a9..6747f42c48 100644
--- a/sysdeps/unix/sysv/linux/pwritev.c
+++ b/sysdeps/unix/sysv/linux/pwritev.c
@@ -18,7 +18,7 @@
 #include <sys/uio.h>
 #include <sysdep-cancel.h>
 
-#if __WORDSIZE != 64 || defined (__ASSUME_OFF_DIFF_OFF64)
+#ifndef __OFF_T_MATCHES_OFF64_T
 
 # ifdef __ASSUME_PREADV
 
diff --git a/sysdeps/unix/sysv/linux/pwritev64.c b/sysdeps/unix/sysv/linux/pwritev64.c
index c0cfe4b413..e162948cab 100644
--- a/sysdeps/unix/sysv/linux/pwritev64.c
+++ b/sysdeps/unix/sysv/linux/pwritev64.c
@@ -49,6 +49,6 @@ pwritev64 (int fd, const struct iovec *vector, int count, off64_t offset)
 # include <sysdeps/posix/pwritev.c>
 #endif
 
-#if __WORDSIZE == 64 && !defined (__ASSUME_OFF_DIFF_OFF64)
+#ifdef __OFF_T_MATCHES_OFF64_T
 strong_alias (pwritev64, pwritev)
 #endif