timerfd: new timerfd API

This is the new timerfd API as it is implemented by the following patch:

int timerfd_create(int clockid, int flags);
int timerfd_settime(int ufd, int flags,
		    const struct itimerspec *utmr,
		    struct itimerspec *otmr);
int timerfd_gettime(int ufd, struct itimerspec *otmr);

The timerfd_create() API creates an un-programmed timerfd fd.  The "clockid"
parameter can be either CLOCK_MONOTONIC or CLOCK_REALTIME.

The timerfd_settime() API give new settings by the timerfd fd, by optionally
retrieving the previous expiration time (in case the "otmr" parameter is not
NULL).

The time value specified in "utmr" is absolute, if the TFD_TIMER_ABSTIME bit
is set in the "flags" parameter.  Otherwise it's a relative time.

The timerfd_gettime() API returns the next expiration time of the timer, or
{0, 0} if the timerfd has not been set yet.

Like the previous timerfd API implementation, read(2) and poll(2) are
supported (with the same interface).  Here's a simple test program I used to
exercise the new timerfd APIs:

http://www.xmailserver.org/timerfd-test2.c

[akpm@linux-foundation.org: coding-style cleanups]
[akpm@linux-foundation.org: fix ia64 build]
[akpm@linux-foundation.org: fix m68k build]
[akpm@linux-foundation.org: fix mips build]
[akpm@linux-foundation.org: fix alpha, arm, blackfin, cris, m68k, s390, sparc and sparc64 builds]
[heiko.carstens@de.ibm.com: fix s390]
[akpm@linux-foundation.org: fix powerpc build]
[akpm@linux-foundation.org: fix sparc64 more]
Signed-off-by: Davide Libenzi <davidel@xmailserver.org>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Davide Libenzi <davidel@xmailserver.org>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Davide Libenzi <davidel@xmailserver.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

15 files changed, 15 insertions, 23 deletions

diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index 79de99e32c35..ba914af18c4f 100644
--- a/arch/alpha/kernel/systbls.S
+++ b/arch/alpha/kernel/systbls.S
@@ -495,7 +495,7 @@ sys_call_table:
 	.quad sys_epoll_pwait
 	.quad sys_utimensat			/* 475 */
 	.quad sys_signalfd
-	.quad sys_timerfd
+	.quad sys_ni_syscall
 	.quad sys_eventfd
 
 	.size sys_call_table, . - sys_call_table
diff --git a/arch/arm/kernel/calls.S b/arch/arm/kernel/calls.S
index cecf658e3625..283e14fff993 100644
--- a/arch/arm/kernel/calls.S
+++ b/arch/arm/kernel/calls.S
@@ -359,7 +359,7 @@
 		CALL(sys_kexec_load)
 		CALL(sys_utimensat)
 		CALL(sys_signalfd)
-/* 350 */	CALL(sys_timerfd)
+/* 350 */	CALL(sys_ni_syscall)
 		CALL(sys_eventfd)
 		CALL(sys_fallocate)
 #ifndef syscalls_counted
diff --git a/arch/blackfin/mach-common/entry.S b/arch/blackfin/mach-common/entry.S
index 56ff51bc8c21..fdd9bf43361e 100644
--- a/arch/blackfin/mach-common/entry.S
+++ b/arch/blackfin/mach-common/entry.S
@@ -1373,7 +1373,7 @@ ENTRY(_sys_call_table)
 	.long _sys_epoll_pwait
 	.long _sys_utimensat
 	.long _sys_signalfd
-	.long _sys_timerfd
+	.long _sys_ni_syscall
 	.long _sys_eventfd	/* 350 */
 	.long _sys_pread64
 	.long _sys_pwrite64
diff --git a/arch/cris/arch-v10/kernel/entry.S b/arch/cris/arch-v10/kernel/entry.S
index ec62c951fa3c..d1361dc119e2 100644
--- a/arch/cris/arch-v10/kernel/entry.S
+++ b/arch/cris/arch-v10/kernel/entry.S
@@ -1167,7 +1167,7 @@ sys_call_table:
 	.long sys_epoll_pwait
 	.long sys_utimensat		/* 320 */
 	.long sys_signalfd
-	.long sys_timerfd
+	.long sys_ni_syscall
 	.long sys_eventfd
 	.long sys_fallocate
 
diff --git a/arch/ia64/kernel/entry.S b/arch/ia64/kernel/entry.S
index c36f43c94600..f5d3efbfbeda 100644
--- a/arch/ia64/kernel/entry.S
+++ b/arch/ia64/kernel/entry.S
@@ -1586,7 +1586,7 @@ sys_call_table:
 	data8 sys_epoll_pwait			// 1305
 	data8 sys_utimensat
 	data8 sys_signalfd
-	data8 sys_timerfd
+	data8 sys_ni_syscall
 	data8 sys_eventfd
 
 	.org sys_call_table + 8*NR_syscalls	// guard against failures to increase NR_syscalls
diff --git a/arch/m68k/kernel/entry.S b/arch/m68k/kernel/entry.S
index 918f5dbeaef6..6dfa3b3c0e2a 100644
--- a/arch/m68k/kernel/entry.S
+++ b/arch/m68k/kernel/entry.S
@@ -742,7 +742,7 @@ sys_call_table:
 	.long sys_epoll_pwait		/* 315 */
 	.long sys_utimensat
 	.long sys_signalfd
-	.long sys_timerfd
+	.long sys_ni_syscall
 	.long sys_eventfd
 	.long sys_fallocate		/* 320 */
 
diff --git a/arch/m68knommu/kernel/syscalltable.S b/arch/m68knommu/kernel/syscalltable.S
index 9620093514bc..1b02b8820068 100644
--- a/arch/m68knommu/kernel/syscalltable.S
+++ b/arch/m68knommu/kernel/syscalltable.S
@@ -336,7 +336,7 @@ ENTRY(sys_call_table)
 	.long sys_epoll_pwait		/* 315 */
 	.long sys_utimensat
 	.long sys_signalfd
-	.long sys_timerfd
+	.long sys_ni_syscall
 	.long sys_eventfd
 	.long sys_fallocate		/* 320 */
 
diff --git a/arch/mips/kernel/scall32-o32.S b/arch/mips/kernel/scall32-o32.S
index 82480a1717d8..f798139e888e 100644
--- a/arch/mips/kernel/scall32-o32.S
+++ b/arch/mips/kernel/scall32-o32.S
@@ -660,7 +660,7 @@ einval:	li	v0, -EINVAL
 	sys	sys_ioprio_get		2	/* 4315 */
 	sys	sys_utimensat		4
 	sys	sys_signalfd		3
-	sys	sys_timerfd		4
+	sys	sys_ni_syscall		0
 	sys	sys_eventfd		1
 	sys	sys_fallocate		6	/* 4320 */
 	.endm
diff --git a/arch/mips/kernel/scall64-64.S b/arch/mips/kernel/scall64-64.S
index c2c10876da2e..a626be6baea3 100644
--- a/arch/mips/kernel/scall64-64.S
+++ b/arch/mips/kernel/scall64-64.S
@@ -475,7 +475,7 @@ sys_call_table:
 	PTR	sys_ioprio_get
 	PTR	sys_utimensat			/* 5275 */
 	PTR	sys_signalfd
-	PTR	sys_timerfd
+	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys_fallocate
 	.size	sys_call_table,.-sys_call_table
diff --git a/arch/mips/kernel/scall64-n32.S b/arch/mips/kernel/scall64-n32.S
index 01993ec3368b..9d5bcaf1b389 100644
--- a/arch/mips/kernel/scall64-n32.S
+++ b/arch/mips/kernel/scall64-n32.S
@@ -401,7 +401,7 @@ EXPORT(sysn32_call_table)
 	PTR	sys_ioprio_get
 	PTR	compat_sys_utimensat
 	PTR	compat_sys_signalfd		/* 5280 */
-	PTR	compat_sys_timerfd
+	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys_fallocate
 	.size	sysn32_call_table,.-sysn32_call_table
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index dd68afce7da5..fd2019c1ec2d 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -523,7 +523,7 @@ sys_call_table:
 	PTR	sys_ioprio_get			/* 4315 */
 	PTR	compat_sys_utimensat
 	PTR	compat_sys_signalfd
-	PTR	compat_sys_timerfd
+	PTR	sys_ni_syscall
 	PTR	sys_eventfd
 	PTR	sys32_fallocate			/* 4320 */
 	.size	sys_call_table,.-sys_call_table
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 6ee1bedbd1bf..062c3d4c0394 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1698,14 +1698,6 @@ compat_sys_signalfd_wrapper:
 	llgfr	%r4,%r4			# compat_size_t
 	jg	compat_sys_signalfd
 
-	.globl	compat_sys_timerfd_wrapper
-compat_sys_timerfd_wrapper:
-	lgfr	%r2,%r2			# int
-	lgfr	%r3,%r3			# int
-	lgfr	%r4,%r4			# int
-	llgtr	%r5,%r5			# struct compat_itimerspec *
-	jg	compat_sys_timerfd
-
 	.globl	sys_eventfd_wrapper
 sys_eventfd_wrapper:
 	llgfr	%r2,%r2			# unsigned int
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index 9e26ed9fe4e7..25eac7802fc4 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -325,5 +325,5 @@ SYSCALL(sys_utimes,sys_utimes,compat_sys_utimes_wrapper)
 SYSCALL(s390_fallocate,sys_fallocate,sys_fallocate_wrapper)
 SYSCALL(sys_utimensat,sys_utimensat,compat_sys_utimensat_wrapper)	/* 315 */
 SYSCALL(sys_signalfd,sys_signalfd,compat_sys_signalfd_wrapper)
-SYSCALL(sys_timerfd,sys_timerfd,compat_sys_timerfd_wrapper)
+NI_SYSCALL						/* 317 old sys_timer_fd */
 SYSCALL(sys_eventfd,sys_eventfd,sys_eventfd_wrapper)
diff --git a/arch/sparc/kernel/systbls.S b/arch/sparc/kernel/systbls.S
index 55722840859c..ee010f4532a0 100644
--- a/arch/sparc/kernel/systbls.S
+++ b/arch/sparc/kernel/systbls.S
@@ -79,7 +79,7 @@ sys_call_table:
 /*295*/	.long sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare
 /*300*/	.long sys_set_robust_list, sys_get_robust_list, sys_migrate_pages, sys_mbind, sys_get_mempolicy
 /*305*/	.long sys_set_mempolicy, sys_kexec_load, sys_move_pages, sys_getcpu, sys_epoll_pwait
-/*310*/	.long sys_utimensat, sys_signalfd, sys_timerfd, sys_eventfd, sys_fallocate
+/*310*/	.long sys_utimensat, sys_signalfd, sys_ni_syscall, sys_eventfd, sys_fallocate
 
 #ifdef CONFIG_SUNOS_EMUL
 	/* Now the SunOS syscall table. */
diff --git a/arch/sparc64/kernel/systbls.S b/arch/sparc64/kernel/systbls.S
index 06d10907d8ce..b8058906e727 100644
--- a/arch/sparc64/kernel/systbls.S
+++ b/arch/sparc64/kernel/systbls.S
@@ -80,7 +80,7 @@ sys_call_table32:
 	.word sys_fchmodat, sys_faccessat, compat_sys_pselect6, compat_sys_ppoll, sys_unshare
 /*300*/	.word compat_sys_set_robust_list, compat_sys_get_robust_list, compat_sys_migrate_pages, compat_sys_mbind, compat_sys_get_mempolicy
 	.word compat_sys_set_mempolicy, compat_sys_kexec_load, compat_sys_move_pages, sys_getcpu, compat_sys_epoll_pwait
-/*310*/	.word compat_sys_utimensat, compat_sys_signalfd, compat_sys_timerfd, sys_eventfd, compat_sys_fallocate
+/*310*/	.word compat_sys_utimensat, compat_sys_signalfd, sys_ni_syscall, sys_eventfd, compat_sys_fallocate
 
 #endif /* CONFIG_COMPAT */
 
@@ -152,7 +152,7 @@ sys_call_table:
 	.word sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare
 /*300*/	.word sys_set_robust_list, sys_get_robust_list, sys_migrate_pages, sys_mbind, sys_get_mempolicy
 	.word sys_set_mempolicy, sys_kexec_load, sys_move_pages, sys_getcpu, sys_epoll_pwait
-/*310*/	.word sys_utimensat, sys_signalfd, sys_timerfd, sys_eventfd, sys_fallocate
+/*310*/	.word sys_utimensat, sys_signalfd, sys_ni_syscall, sys_eventfd, sys_fallocate
 
 #if defined(CONFIG_SUNOS_EMUL) || defined(CONFIG_SOLARIS_EMUL) || \
     defined(CONFIG_SOLARIS_EMUL_MODULE)