This patch is based on the following:

    commit e412ac4971d27ea84f3d63ce425c6ab2d6a67f23
    Author: Andi Kleen <ak@suse.de>
    Date:   Wed Jun 20 12:23:30 2007 +0200

	x86_64: Fix readahead/sync_file_range/fadvise64 compat calls

	Correctly convert the u64 arguments from 32bit to 64bit.

	Pointed out by Heiko Carstens.

	I guess this proves Linus' theory that nobody uses the more exotic Linux
	specific syscalls.  It wasn't discovered by a user.

	Signed-off-by: Andi Kleen <ak@suse.de>
	Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

The differences are to make the patch apply and also to apply it to the
xen syscalls.

    Signed-off-by: John Haxby <john.haxby@oracle.com>

diff --git a/arch/x86_64/ia32/ia32entry.S b/arch/x86_64/ia32/ia32entry.S
index 21868f9..47565c3 100644
--- a/arch/x86_64/ia32/ia32entry.S
+++ b/arch/x86_64/ia32/ia32entry.S
@@ -561,7 +561,7 @@ ia32_sys_call_table:
 #endif
 	.quad quiet_ni_syscall    	/* security */
 	.quad sys_gettid	
-	.quad sys_readahead	/* 225 */
+	.quad sys32_readahead	/* 225 */
 	.quad sys_setxattr
 	.quad sys_lsetxattr
 	.quad sys_fsetxattr
@@ -612,7 +612,7 @@ ia32_sys_call_table:
 	.quad compat_sys_io_getevents
 	.quad compat_sys_io_submit
 	.quad sys_io_cancel
-	.quad sys_fadvise64		/* 250 */
+	.quad sys32_fadvise64		/* 250 */
 	.quad quiet_ni_syscall 	/* free_huge_pages */
 	.quad sys_exit_group
 	.quad sys32_lookup_dcookie
diff --git a/arch/x86_64/ia32/sys_ia32.c b/arch/x86_64/ia32/sys_ia32.c
index 200fdde..99a78a3 100644
--- a/arch/x86_64/ia32/sys_ia32.c
+++ b/arch/x86_64/ia32/sys_ia32.c
@@ -1404,6 +1404,18 @@
 	return sys_lookup_dcookie(((u64)addr_high << 32) | addr_low, buf, len);
 }
 
+asmlinkage ssize_t sys32_readahead(int fd, unsigned off_lo, unsigned off_hi, size_t count)
+{
+	return sys_readahead(fd, ((u64)off_hi << 32) | off_lo, count);
+}
+
+asmlinkage long sys32_fadvise64(int fd, unsigned offset_lo, unsigned offset_hi, size_t len,
+		     int advice)
+{
+	return sys_fadvise64_64(fd, ((u64)offset_hi << 32) | offset_lo,
+				len, advice);
+}
+
 cond_syscall(sys32_ipc)
 
 static int __init ia32_init (void)
diff -up a/arch/x86_64/ia32/ia32entry-xen.S b/arch/x86_64/ia32/ia32entry-xen.S
--- a/arch/x86_64/ia32/ia32entry-xen.S
+++ b/arch/x86_64/ia32/ia32entry-xen.S
@@ -587,7 +587,7 @@ ia32_sys_call_table:
 	.quad quiet_ni_syscall		/* tux */
 	.quad quiet_ni_syscall    	/* security */
 	.quad sys_gettid	
-	.quad sys_readahead	/* 225 */
+	.quad sys32_readahead	/* 225 */
 	.quad sys_setxattr
 	.quad sys_lsetxattr
 	.quad sys_fsetxattr
@@ -612,7 +612,7 @@ ia32_sys_call_table:
 	.quad compat_sys_io_getevents
 	.quad compat_sys_io_submit
 	.quad sys_io_cancel
-	.quad sys_fadvise64		/* 250 */
+	.quad sys32_fadvise64		/* 250 */
 	.quad quiet_ni_syscall 	/* free_huge_pages */
 	.quad sys_exit_group
 	.quad sys32_lookup_dcookie