ppc64: add mmap64 support

arch/ppc64/kernel/misc.S

@@ -696,7 +696,7 @@ _GLOBAL(sys_call_table32)
 	.llong .sys_vfork
 	.llong .sys32_getrlimit	        /* 190 */
 	.llong .sys32_readahead
-	.llong .sys_ni_syscall		/* 192 - reserved - mmap2 */
+	.llong .ppc32_mmap2
 	.llong .sys32_truncate64	/* 193 - truncate64 */
 	.llong .sys32_ftruncate64	/* 194 - ftruncate64 */
 	.llong .sys_stat64      	/* 195 - stat64 */

arch/ppc64/kernel/sys32.S

@@ -44,10 +44,10 @@ _GLOBAL(sys32_getsockopt)
 	clrldi		r7, r7, 32	/* int *optlen parm */
 	b		.sys_getsockopt
 
-_GLOBAL(sys32_mmap2)
+_GLOBAL(ppc32_mmap2)
 	clrldi		r7, r7, 32	/* unsigned long fd parm */
-	extsw		r8, r8		/* off_t offset */
-	b		.sys_mmap
+	clrldi		r8, r8, 32	/* unsigned long pgoff */
+	b		.sys32_mmap2
 
 _GLOBAL(sys32_socketcall)	/* r3=call, r4=args */
 	cmpwi		r3, 1

arch/ppc64/kernel/sys_ppc32.c

@@ -4249,3 +4249,10 @@ asmlinkage int sys32_sched_getaffinity(__kernel_pid_t32 pid, unsigned int len,
 
 	return ret;
 }
+unsigned long sys32_mmap2(unsigned long addr, size_t len,
+			  unsigned long prot, unsigned long flags,
+			  unsigned long fd, unsigned long pgoff)
+{
+	/* This should remain 12 even if PAGE_SIZE changes */
+	return sys_mmap(addr, len, prot, flags, fd, pgoff << 12);
+}