uClibc: backport sync_file_range fixes (closes: #19350)

Signed-off-by: Nicolas Thill <nico@openwrt.org>

SVN-Revision: 45249

toolchain/uClibc/patches-0.9.33.2/025-libc-sync_file_range.patch

+Index: uClibc-0.9.33.2/libc/sysdeps/linux/common/sync_file_range.c
+===================================================================
+--- uClibc-0.9.33.2.orig/libc/sysdeps/linux/common/sync_file_range.c	2012-05-15 09:20:09.000000000 +0200
++++ uClibc-0.9.33.2/libc/sysdeps/linux/common/sync_file_range.c	2015-04-03 00:27:47.701221722 +0200
+@@ -4,24 +4,39 @@
+  *
+  * Copyright (C) 2008 Bernhard Reutner-Fischer <uclibc@uclibc.org>
+  *
+- * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
++ * Licensed under the LGPL v2.1 or later, see the file COPYING.LIB in this tarball.
+  */
+ 
+ #include <sys/syscall.h>
+-#if defined __USE_GNU
+-#include <fcntl.h>
++#if defined __UCLIBC_HAS_LFS__ && defined __USE_GNU
++# include <bits/wordsize.h>
++# include <endian.h>
++# include <fcntl.h>
+ 
+-#if defined __NR_sync_file_range && defined __UCLIBC_HAS_LFS__
+-#define __NR___syscall_sync_file_range __NR_sync_file_range
+-static __inline__ _syscall6(int, __syscall_sync_file_range, int, fd,
+-		off_t, offset_hi, off_t, offset_lo,
+-		off_t, nbytes_hi, off_t, nbytes_lo, unsigned int, flags)
++# ifdef __NR_sync_file_range2
++#  undef __NR_sync_file_range
++#  define __NR_sync_file_range __NR_sync_file_range2
++# endif
++
++# ifdef __NR_sync_file_range
+ int sync_file_range(int fd, off64_t offset, off64_t nbytes, unsigned int flags)
+ {
+-	return __syscall_sync_file_range(fd,
+-		__LONG_LONG_PAIR((long)(offset >> 32), (long)(offset & 0xffffffff)),
+-		__LONG_LONG_PAIR((long)(nbytes >> 32), (long)(nbytes & 0xffffffff)),
+-		flags);
++#  if defined __powerpc__ && __WORDSIZE == 64
++	return INLINE_SYSCALL(sync_file_range, 4, fd, flags, offset, nbytes);
++#  elif (defined __mips__ && _MIPS_SIM == _ABIO32) || \
++	(defined(__UCLIBC_SYSCALL_ALIGN_64BIT__) && !(defined(__powerpc__) || defined(__xtensa__)))
++	/* arch with 64-bit data in even reg alignment #2: [arcv2/others-in-future]
++	 * stock syscall handler in kernel (reg hole punched)
++	 * see libc/sysdeps/linux/common/posix_fadvise.c for more details */
++	return INLINE_SYSCALL(sync_file_range, 7, fd, 0,
++			OFF64_HI_LO(offset), OFF64_HI_LO(nbytes), flags);
++#  elif defined __NR_sync_file_range2
++	return INLINE_SYSCALL(sync_file_range, 6, fd, flags,
++			OFF64_HI_LO(offset), OFF64_HI_LO(nbytes));
++#  else
++	return INLINE_SYSCALL(sync_file_range, 6, fd,
++			OFF64_HI_LO(offset), OFF64_HI_LO(nbytes), flags);
++#  endif
+ }
+-#endif
++# endif
+ #endif