x86, x32: Use compat shims for io_{setup,submit}

The io_setup takes a pointer to a context id of type aio_context_t.
This in turn is typed to a __kernel_ulong_t.  We could tweak the
exported headers to define this as a 64bit quantity for specific
ABIs, but since we already have a 32bit compat shim for the x86 ABI,
let's just re-use that logic.  The libaio package is also written to
expect this as a pointer type, so a compat shim would simplify that.

The io_submit func operates on an array of pointers to iocb structs.
Padding out the array to be 64bit aligned is a huge pain, so convert
it over to the existing compat shim too.

We don't convert io_getevents to the compat func as its only purpose
is to handle the timespec struct, and the x32 ABI uses 64bit times.

With this change, the libaio package can now pass its testsuite when
built for the x32 ABI.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Link: http://lkml.kernel.org/r/1399250595-5005-1-git-send-email-vapier@gentoo.org
Cc: H.J. Lu <hjl.tools@gmail.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: <stable@vger.kernel.org> # v3.4+

diff --git a/arch/x86/syscalls/syscall_64.tbl b/arch/x86/syscalls/syscall_64.tbl
index 04376ac3d9efb9f8d73f4d096bea692d891c635b..ec255a1646d2da7629c79cd2e0014d341c3b6259 100644 (file)
--- a/arch/x86/syscalls/syscall_64.tbl
+++ b/arch/x86/syscalls/syscall_64.tbl
@@ -212,10 +212,10 @@
 203    common  sched_setaffinity       sys_sched_setaffinity
 204    common  sched_getaffinity       sys_sched_getaffinity
 205    64      set_thread_area
-206    common  io_setup                sys_io_setup
+206    64      io_setup                sys_io_setup
 207    common  io_destroy              sys_io_destroy
 208    common  io_getevents            sys_io_getevents
-209    common  io_submit               sys_io_submit
+209    64      io_submit               sys_io_submit
 210    common  io_cancel               sys_io_cancel
 211    64      get_thread_area
 212    common  lookup_dcookie          sys_lookup_dcookie
@@ -359,3 +359,5 @@
 540    x32     process_vm_writev       compat_sys_process_vm_writev
 541    x32     setsockopt              compat_sys_setsockopt
 542    x32     getsockopt              compat_sys_getsockopt
+543    x32     io_setup                compat_sys_io_setup
+544    x32     io_submit               compat_sys_io_submit