[git commit] Avoid warnings about shifting more bits than we have

[Ron]

commit: http://git.uclibc.org/uClibc/commit/?id=c06d418fa75cc20a3f12576818b4d77f1c4cfdcb
branch: http://git.uclibc.org/uClibc/commit/?id=refs/heads/nptl


The test here is a constant expression and will compile out.
For platforms that don't need the shift the code gets slightly smaller
and simpler, for those that do the result is unchanged.

Signed-off-by: Ron Lee <ron at debian.org>
Signed-off-by: Mike Frysinger <vapier at gentoo.org>
Signed-off-by: Austin Foxley <austinf at cetoncorp.com>
---
 libc/sysdeps/linux/arm/posix_fadvise.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/libc/sysdeps/linux/arm/posix_fadvise.c b/libc/sysdeps/linux/arm/posix_fadvise.c
index b23eb3d..278bff9 100644
--- a/libc/sysdeps/linux/arm/posix_fadvise.c
+++ b/libc/sysdeps/linux/arm/posix_fadvise.c
@@ -12,6 +12,8 @@
 
 #if defined __NR_arm_fadvise64_64
 
+#define HIGH_BITS(x) (sizeof(x) > 4 ? (x) >> 32 : 0)
+
 /* Was named __libc_posix_fadvise for some inexplicable reason.
 ** google says only uclibc has *__libc*_posix_fadviseXXX,
 ** so it cannot be compat with anything.
@@ -27,8 +29,8 @@ int posix_fadvise(int fd, off_t offset, off_t len, int advise)
 {
   INTERNAL_SYSCALL_DECL (err);
   int ret = INTERNAL_SYSCALL (arm_fadvise64_64, err, 6, fd, advise,
-                              __LONG_LONG_PAIR ((long)(offset >> 32), (long)offset),
-                              __LONG_LONG_PAIR ((long)(len >> 32), (long)len));
+                              __LONG_LONG_PAIR (HIGH_BITS(offset), (long)offset),
+                              __LONG_LONG_PAIR (HIGH_BITS(len), (long)len));
 
     if (INTERNAL_SYSCALL_ERROR_P (ret, err))
       return INTERNAL_SYSCALL_ERRNO (ret, err);
-- 
1.6.3.3