[MIPS] Wire up the timerfd_*() o32 system calls

This patch enables the system calls timerfd_create(), timerfd_settime()
and timerfd_gettime() for MIPS architecture.

Please see the following Bugzilla entry for more details:

http://bugzilla.kernel.org/show_bug.cgi?id=10038

This was tested using a Malta 4Kc board in both little-endian and
big-endian modes. The unit test program is available from the URL
above.

Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@gmail.com>

[Ralf: Added N64, N32 and O32 bits on 64-bit kernels.]
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/kernel/scall32-o32.S

@@ -663,6 +663,9 @@ einval:	li	v0, -EINVAL
 	sys	sys_ni_syscall		0
 	sys	sys_eventfd		1
 	sys	sys_fallocate		6	/* 4320 */
+	sys	sys_timerfd_create	2
+	sys	sys_timerfd_gettime	2
+	sys	sys_timerfd_settime	4
 	.endm
 
 	/* We pre-compute the number of _instruction_ bytes needed to

arch/mips/kernel/scall64-64.S

@@ -478,4 +478,7 @@ sys_call_table:
 	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys_fallocate
+	PTR	sys_timerfd_create		/* 5280 */
+	PTR	sys_timerfd_gettime
+	PTR	sys_timerfd_settime
 	.size	sys_call_table,.-sys_call_table

arch/mips/kernel/scall64-n32.S

@@ -404,4 +404,7 @@ EXPORT(sysn32_call_table)
 	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys_fallocate
+	PTR	sys_timerfd_create
+	PTR	sys_timerfd_gettime		/* 5285 */
+	PTR	sys_timerfd_settime
 	.size	sysn32_call_table,.-sysn32_call_table

arch/mips/kernel/scall64-o32.S

@@ -526,4 +526,7 @@ sys_call_table:
 	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys32_fallocate			/* 4320 */
+	PTR	sys_timerfd_create
+	PTR	sys_timerfd_gettime
+	PTR	sys_timerfd_settime
 	.size	sys_call_table,.-sys_call_table

include/asm-mips/unistd.h

@@ -341,16 +341,19 @@
 #define __NR_timerfd			(__NR_Linux + 318)
 #define __NR_eventfd			(__NR_Linux + 319)
 #define __NR_fallocate			(__NR_Linux + 320)
+#define __NR_timerfd_create		(__NR_Linux + 321)
+#define __NR_timerfd_gettime		(__NR_Linux + 322)
+#define __NR_timerfd_settime		(__NR_Linux + 323)
 
 /*
  * Offset of the last Linux o32 flavoured syscall
  */
-#define __NR_Linux_syscalls		320
+#define __NR_Linux_syscalls		323
 
 #endif /* _MIPS_SIM == _MIPS_SIM_ABI32 */
 
 #define __NR_O32_Linux			4000
-#define __NR_O32_Linux_syscalls		320
+#define __NR_O32_Linux_syscalls		323
 
 #if _MIPS_SIM == _MIPS_SIM_ABI64
 
@@ -638,16 +641,19 @@
 #define __NR_timerfd			(__NR_Linux + 277)
 #define __NR_eventfd			(__NR_Linux + 278)
 #define __NR_fallocate			(__NR_Linux + 279)
+#define __NR_timerfd_create		(__NR_Linux + 280)
+#define __NR_timerfd_gettime		(__NR_Linux + 281)
+#define __NR_timerfd_settime		(__NR_Linux + 282)
 
 /*
  * Offset of the last Linux 64-bit flavoured syscall
  */
-#define __NR_Linux_syscalls		279
+#define __NR_Linux_syscalls		282
 
 #endif /* _MIPS_SIM == _MIPS_SIM_ABI64 */
 
 #define __NR_64_Linux			5000
-#define __NR_64_Linux_syscalls		279
+#define __NR_64_Linux_syscalls		282
 
 #if _MIPS_SIM == _MIPS_SIM_NABI32
 
@@ -939,16 +945,19 @@
 #define __NR_timerfd			(__NR_Linux + 281)
 #define __NR_eventfd			(__NR_Linux + 282)
 #define __NR_fallocate			(__NR_Linux + 283)
+#define __NR_timerfd_create		(__NR_Linux + 284)
+#define __NR_timerfd_gettime		(__NR_Linux + 285)
+#define __NR_timerfd_settime		(__NR_Linux + 286)
 
 /*
  * Offset of the last N32 flavoured syscall
  */
-#define __NR_Linux_syscalls		283
+#define __NR_Linux_syscalls		286
 
 #endif /* _MIPS_SIM == _MIPS_SIM_NABI32 */
 
 #define __NR_N32_Linux			6000
-#define __NR_N32_Linux_syscalls		283
+#define __NR_N32_Linux_syscalls		286
 
 #ifdef __KERNEL__