Fix MIPS o32 posix_fadvise.

The posix_fadvise consolidation broke posix_fadvise for MIPS o32, so
resulting in posix/tst-posix_fadvise failing.

MIPS o32 (and the other ABIs) has only the posix_fadvise64 syscall,
which acts like posix_fadvise64_64 (in the o32 case, because of the
alignment argument it's actually a 7-argument syscall).  The generic
posix_fadvise implementation presumes that if __NR_fadvise64 is
defined, it's for the case where a single len argument is passed to
the syscall rather than two syscall arguments in the case of a 32-bit
system.

The generic posix_fadvise64 works fine for this case (defining
__NR_fadvise64_64 to __NR_fadvise64 as needed).  ARM has a
posix_fadvise.c that uses __posix_fadvise64_l64 in posix_fadvise, and
that approach also works for MIPS o32, so this patch makes MIPS o32
include the ARM file.

Tested for MIPS o32.

	* sysdeps/unix/sysv/linux/mips/mips32/posix_fadvise.c: New file.

diff --git a/ChangeLog b/ChangeLog
index 5b0601fa1b79f13424e5e050e27717627f6ff284..16eb52a900bba39664cb4f72975fc3e7c27b30d3 100644 (file)
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2017-01-12  Joseph Myers  <joseph@codesourcery.com>
 
+       * sysdeps/unix/sysv/linux/mips/mips32/posix_fadvise.c: New file.
+
        * math/fgetexcptflg.c (__fegetexceptflag): Store 0 in fexcept_t
        object.
 

diff --git a/sysdeps/unix/sysv/linux/mips/mips32/posix_fadvise.c b/sysdeps/unix/sysv/linux/mips/mips32/posix_fadvise.c
new file mode 100644 (file)
index 0000000..6e9c3f9
--- /dev/null
+++ b/sysdeps/unix/sysv/linux/mips/mips32/posix_fadvise.c
@@ -0,0 +1,4 @@
+/* The o32 MIPS fadvise64 syscall behaves as fadvise64_64.  The ARM
+   implementation of posix_fadvise works correctly for this case; the
+   generic implementation mishandles it.  */
+#include <sysdeps/unix/sysv/linux/arm/posix_fadvise.c>