24 files changed, 210 insertions, 118 deletions

diff --git a/arch/alpha/kernel/systbls.S b/arch/alpha/kernel/systbls.S
index 79de99e3..ba914af 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 cecf658..283e14f 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 56ff51b..fdd9bf43 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 ec62c95..d1361dc 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 c36f43c..f5d3efb 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 918f5db..6dfa3b3 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 9620093..1b02b88 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 82480a1..f798139 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 c2c1087..a626be6 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 01993ec..9d5bcaf 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 dd68afc..fd2019c 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 6ee1bed..062c3d4 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 9e26ed9..25eac78 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 5572284..ee010f4 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 06d1090..b805890 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)
diff --git a/fs/compat.c b/fs/compat.c
index 5216c3f..69baca5 100644
--- a/fs/compat.c
+++ b/fs/compat.c
@@ -2206,19 +2206,41 @@ asmlinkage long compat_sys_signalfd(int ufd,
 
 #ifdef CONFIG_TIMERFD
 
-asmlinkage long compat_sys_timerfd(int ufd, int clockid, int flags,
-				   const struct compat_itimerspec __user *utmr)
+asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
+				   const struct compat_itimerspec __user *utmr,
+				   struct compat_itimerspec __user *otmr)
 {
+	int error;
 	struct itimerspec t;
 	struct itimerspec __user *ut;
 
 	if (get_compat_itimerspec(&t, utmr))
 		return -EFAULT;
-	ut = compat_alloc_user_space(sizeof(*ut));
-	if (copy_to_user(ut, &t, sizeof(t)))
+	ut = compat_alloc_user_space(2 * sizeof(struct itimerspec));
+	if (copy_to_user(&ut[0], &t, sizeof(t)))
 		return -EFAULT;
+	error = sys_timerfd_settime(ufd, flags, &ut[0], &ut[1]);
+	if (!error && otmr)
+		error = (copy_from_user(&t, &ut[1], sizeof(struct itimerspec)) ||
+			 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
+
+	return error;
+}
+
+asmlinkage long compat_sys_timerfd_gettime(int ufd,
+				   struct compat_itimerspec __user *otmr)
+{
+	int error;
+	struct itimerspec t;
+	struct itimerspec __user *ut;
 
-	return sys_timerfd(ufd, clockid, flags, ut);
+	ut = compat_alloc_user_space(sizeof(struct itimerspec));
+	error = sys_timerfd_gettime(ufd, ut);
+	if (!error)
+		error = (copy_from_user(&t, ut, sizeof(struct itimerspec)) ||
+			 put_compat_itimerspec(otmr, &t)) ? -EFAULT: 0;
+
+	return error;
 }
 
 #endif /* CONFIG_TIMERFD */
diff --git a/fs/timerfd.c b/fs/timerfd.c
index 61983f3..10c80b5 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -25,13 +25,15 @@ struct timerfd_ctx {
 	struct hrtimer tmr;
 	ktime_t tintv;
 	wait_queue_head_t wqh;
+	u64 ticks;
 	int expired;
+	int clockid;
 };
 
 /*
  * This gets called when the timer event triggers. We set the "expired"
  * flag, but we do not re-arm the timer (in case it's necessary,
- * tintv.tv64 != 0) until the timer is read.
+ * tintv.tv64 != 0) until the timer is accessed.
  */
 static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr)
 {
@@ -40,13 +42,24 @@ static enum hrtimer_restart timerfd_tmrproc(struct hrtimer *htmr)
 
 	spin_lock_irqsave(&ctx->wqh.lock, flags);
 	ctx->expired = 1;
+	ctx->ticks++;
 	wake_up_locked(&ctx->wqh);
 	spin_unlock_irqrestore(&ctx->wqh.lock, flags);
 
 	return HRTIMER_NORESTART;
 }
 
-static void timerfd_setup(struct timerfd_ctx *ctx, int clockid, int flags,
+static ktime_t timerfd_get_remaining(struct timerfd_ctx *ctx)
+{
+	ktime_t now, remaining;
+
+	now = ctx->tmr.base->get_time();
+	remaining = ktime_sub(ctx->tmr.expires, now);
+
+	return remaining.tv64 < 0 ? ktime_set(0, 0): remaining;
+}
+
+static void timerfd_setup(struct timerfd_ctx *ctx, int flags,
 			  const struct itimerspec *ktmr)
 {
 	enum hrtimer_mode htmode;
@@ -57,8 +70,9 @@ static void timerfd_setup(struct timerfd_ctx *ctx, int clockid, int flags,
 
 	texp = timespec_to_ktime(ktmr->it_value);
 	ctx->expired = 0;
+	ctx->ticks = 0;
 	ctx->tintv = timespec_to_ktime(ktmr->it_interval);
-	hrtimer_init(&ctx->tmr, clockid, htmode);
+	hrtimer_init(&ctx->tmr, ctx->clockid, htmode);
 	ctx->tmr.expires = texp;
 	ctx->tmr.function = timerfd_tmrproc;
 	if (texp.tv64 != 0)
@@ -83,7 +97,7 @@ static unsigned int timerfd_poll(struct file *file, poll_table *wait)
 	poll_wait(file, &ctx->wqh, wait);
 
 	spin_lock_irqsave(&ctx->wqh.lock, flags);
-	if (ctx->expired)
+	if (ctx->ticks)
 		events |= POLLIN;
 	spin_unlock_irqrestore(&ctx->wqh.lock, flags);
 
@@ -102,11 +116,11 @@ static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
 		return -EINVAL;
 	spin_lock_irq(&ctx->wqh.lock);
 	res = -EAGAIN;
-	if (!ctx->expired && !(file->f_flags & O_NONBLOCK)) {
+	if (!ctx->ticks && !(file->f_flags & O_NONBLOCK)) {
 		__add_wait_queue(&ctx->wqh, &wait);
 		for (res = 0;;) {
 			set_current_state(TASK_INTERRUPTIBLE);
-			if (ctx->expired) {
+			if (ctx->ticks) {
 				res = 0;
 				break;
 			}
@@ -121,22 +135,21 @@ static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
 		__remove_wait_queue(&ctx->wqh, &wait);
 		__set_current_state(TASK_RUNNING);
 	}
-	if (ctx->expired) {
-		ctx->expired = 0;
-		if (ctx->tintv.tv64 != 0) {
+	if (ctx->ticks) {
+		ticks = ctx->ticks;
+		if (ctx->expired && ctx->tintv.tv64) {
 			/*
 			 * If tintv.tv64 != 0, this is a periodic timer that
 			 * needs to be re-armed. We avoid doing it in the timer
 			 * callback to avoid DoS attacks specifying a very
 			 * short timer period.
 			 */
-			ticks = (u64)
-				hrtimer_forward(&ctx->tmr,
-						hrtimer_cb_get_time(&ctx->tmr),
-						ctx->tintv);
+			ticks += hrtimer_forward_now(&ctx->tmr,
+						     ctx->tintv) - 1;
 			hrtimer_restart(&ctx->tmr);
-		} else
-			ticks = 1;
+		}
+		ctx->expired = 0;
+		ctx->ticks = 0;
 	}
 	spin_unlock_irq(&ctx->wqh.lock);
 	if (ticks)
@@ -150,76 +163,132 @@ static const struct file_operations timerfd_fops = {
 	.read		= timerfd_read,
 };
 
-asmlinkage long sys_timerfd(int ufd, int clockid, int flags,
-			    const struct itimerspec __user *utmr)
+static struct file *timerfd_fget(int fd)
+{
+	struct file *file;
+
+	file = fget(fd);
+	if (!file)
+		return ERR_PTR(-EBADF);
+	if (file->f_op != &timerfd_fops) {
+		fput(file);
+		return ERR_PTR(-EINVAL);
+	}
+
+	return file;
+}
+
+asmlinkage long sys_timerfd_create(int clockid, int flags)
 {
-	int error;
+	int error, ufd;
 	struct timerfd_ctx *ctx;
 	struct file *file;
 	struct inode *inode;
-	struct itimerspec ktmr;
-
-	if (copy_from_user(&ktmr, utmr, sizeof(ktmr)))
-		return -EFAULT;
 
+	if (flags)
+		return -EINVAL;
 	if (clockid != CLOCK_MONOTONIC &&
 	    clockid != CLOCK_REALTIME)
 		return -EINVAL;
+
+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	init_waitqueue_head(&ctx->wqh);
+	ctx->clockid = clockid;
+	hrtimer_init(&ctx->tmr, clockid, HRTIMER_MODE_ABS);
+
+	error = anon_inode_getfd(&ufd, &inode, &file, "[timerfd]",
+				 &timerfd_fops, ctx);
+	if (error) {
+		kfree(ctx);
+		return error;
+	}
+
+	return ufd;
+}
+
+asmlinkage long sys_timerfd_settime(int ufd, int flags,
+				    const struct itimerspec __user *utmr,
+				    struct itimerspec __user *otmr)
+{
+	struct file *file;
+	struct timerfd_ctx *ctx;
+	struct itimerspec ktmr, kotmr;
+
+	if (copy_from_user(&ktmr, utmr, sizeof(ktmr)))
+		return -EFAULT;
+
 	if (!timespec_valid(&ktmr.it_value) ||
 	    !timespec_valid(&ktmr.it_interval))
 		return -EINVAL;
 
-	if (ufd == -1) {
-		ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
-		if (!ctx)
-			return -ENOMEM;
-
-		init_waitqueue_head(&ctx->wqh);
-
-		timerfd_setup(ctx, clockid, flags, &ktmr);
-
-		/*
-		 * When we call this, the initialization must be complete, since
-		 * anon_inode_getfd() will install the fd.
-		 */
-		error = anon_inode_getfd(&ufd, &inode, &file, "[timerfd]",
-					 &timerfd_fops, ctx);
-		if (error)
-			goto err_tmrcancel;
-	} else {
-		file = fget(ufd);
-		if (!file)
-			return -EBADF;
-		ctx = file->private_data;
-		if (file->f_op != &timerfd_fops) {
-			fput(file);
-			return -EINVAL;
-		}
-		/*
-		 * We need to stop the existing timer before reprogramming
-		 * it to the new values.
-		 */
-		for (;;) {
-			spin_lock_irq(&ctx->wqh.lock);
-			if (hrtimer_try_to_cancel(&ctx->tmr) >= 0)
-				break;
-			spin_unlock_irq(&ctx->wqh.lock);
-			cpu_relax();
-		}
-		/*
-		 * Re-program the timer to the new value ...
-		 */
-		timerfd_setup(ctx, clockid, flags, &ktmr);
+	file = timerfd_fget(ufd);
+	if (IS_ERR(file))
+		return PTR_ERR(file);
+	ctx = file->private_data;
 
+	/*
+	 * We need to stop the existing timer before reprogramming
+	 * it to the new values.
+	 */
+	for (;;) {
+		spin_lock_irq(&ctx->wqh.lock);
+		if (hrtimer_try_to_cancel(&ctx->tmr) >= 0)
+			break;
 		spin_unlock_irq(&ctx->wqh.lock);
-		fput(file);
+		cpu_relax();
 	}
 
-	return ufd;
+	/*
+	 * If the timer is expired and it's periodic, we need to advance it
+	 * because the caller may want to know the previous expiration time.
+	 * We do not update "ticks" and "expired" since the timer will be
+	 * re-programmed again in the following timerfd_setup() call.
+	 */
+	if (ctx->expired && ctx->tintv.tv64)
+		hrtimer_forward_now(&ctx->tmr, ctx->tintv);
 
-err_tmrcancel:
-	hrtimer_cancel(&ctx->tmr);
-	kfree(ctx);
-	return error;
+	kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
+	kotmr.it_interval = ktime_to_timespec(ctx->tintv);
+
+	/*
+	 * Re-program the timer to the new value ...
+	 */
+	timerfd_setup(ctx, flags, &ktmr);
+
+	spin_unlock_irq(&ctx->wqh.lock);
+	fput(file);
+	if (otmr && copy_to_user(otmr, &kotmr, sizeof(kotmr)))
+		return -EFAULT;
+
+	return 0;
+}
+
+asmlinkage long sys_timerfd_gettime(int ufd, struct itimerspec __user *otmr)
+{
+	struct file *file;
+	struct timerfd_ctx *ctx;
+	struct itimerspec kotmr;
+
+	file = timerfd_fget(ufd);
+	if (IS_ERR(file))
+		return PTR_ERR(file);
+	ctx = file->private_data;
+
+	spin_lock_irq(&ctx->wqh.lock);
+	if (ctx->expired && ctx->tintv.tv64) {
+		ctx->expired = 0;
+		ctx->ticks +=
+			hrtimer_forward_now(&ctx->tmr, ctx->tintv) - 1;
+		hrtimer_restart(&ctx->tmr);
+	}
+	kotmr.it_value = ktime_to_timespec(timerfd_get_remaining(ctx));
+	kotmr.it_interval = ktime_to_timespec(ctx->tintv);
+	spin_unlock_irq(&ctx->wqh.lock);
+	fput(file);
+
+	return copy_to_user(otmr, &kotmr, sizeof(kotmr)) ? -EFAULT: 0;
 }
 
diff --git a/include/asm-powerpc/systbl.h b/include/asm-powerpc/systbl.h
index 0c8b0d6..e996521 100644
--- a/include/asm-powerpc/systbl.h
+++ b/include/asm-powerpc/systbl.h
@@ -309,7 +309,7 @@ SYSCALL_SPU(getcpu)
 COMPAT_SYS(epoll_pwait)
 COMPAT_SYS_SPU(utimensat)
 COMPAT_SYS_SPU(signalfd)
-COMPAT_SYS_SPU(timerfd)
+SYSCALL(ni_syscall)
 SYSCALL_SPU(eventfd)
 COMPAT_SYS_SPU(sync_file_range2)
 COMPAT_SYS(fallocate)
diff --git a/include/linux/compat.h b/include/linux/compat.h
index d38655f..ae0a483 100644
--- a/include/linux/compat.h
+++ b/include/linux/compat.h
@@ -279,8 +279,11 @@ asmlinkage long compat_sys_utimensat(unsigned int dfd, char __user *filename,
 asmlinkage long compat_sys_signalfd(int ufd,
 				const compat_sigset_t __user *sigmask,
                                 compat_size_t sigsetsize);
-asmlinkage long compat_sys_timerfd(int ufd, int clockid, int flags,
-				const struct compat_itimerspec __user *utmr);
+asmlinkage long compat_sys_timerfd_settime(int ufd, int flags,
+				   const struct compat_itimerspec __user *utmr,
+				   struct compat_itimerspec __user *otmr);
+asmlinkage long compat_sys_timerfd_gettime(int ufd,
+				   struct compat_itimerspec __user *otmr);
 
 #endif /* CONFIG_COMPAT */
 #endif /* _LINUX_COMPAT_H */
diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h
index 3fed27c..8371b66 100644
--- a/include/linux/hrtimer.h
+++ b/include/linux/hrtimer.h
@@ -301,12 +301,12 @@ static inline int hrtimer_is_queued(struct hrtimer *timer)
 }
 
 /* Forward a hrtimer so it expires after now: */
-extern unsigned long
+extern u64
 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval);
 
 /* Forward a hrtimer so it expires after the hrtimer's current now */
-static inline unsigned long hrtimer_forward_now(struct hrtimer *timer,
-						ktime_t interval)
+static inline u64 hrtimer_forward_now(struct hrtimer *timer,
+				      ktime_t interval)
 {
 	return hrtimer_forward(timer, timer->base->get_time(), interval);
 }
@@ -329,9 +329,9 @@ extern void hrtimer_run_pending(void);
 extern void __init hrtimers_init(void);
 
 #if BITS_PER_LONG < 64
-extern unsigned long ktime_divns(const ktime_t kt, s64 div);
+extern u64 ktime_divns(const ktime_t kt, s64 div);
 #else /* BITS_PER_LONG < 64 */
-# define ktime_divns(kt, div)		(unsigned long)((kt).tv64 / (div))
+# define ktime_divns(kt, div)		(u64)((kt).tv64 / (div))
 #endif
 
 /* Show pending timers: */
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 61def7c8..4c2577b 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -607,8 +607,11 @@ asmlinkage long sys_set_robust_list(struct robust_list_head __user *head,
 				    size_t len);
 asmlinkage long sys_getcpu(unsigned __user *cpu, unsigned __user *node, struct getcpu_cache __user *cache);
 asmlinkage long sys_signalfd(int ufd, sigset_t __user *user_mask, size_t sizemask);
-asmlinkage long sys_timerfd(int ufd, int clockid, int flags,
-			    const struct itimerspec __user *utmr);
+asmlinkage long sys_timerfd_create(int clockid, int flags);
+asmlinkage long sys_timerfd_settime(int ufd, int flags,
+				    const struct itimerspec __user *utmr,
+				    struct itimerspec __user *otmr);
+asmlinkage long sys_timerfd_gettime(int ufd, struct itimerspec __user *otmr);
 asmlinkage long sys_eventfd(unsigned int count);
 asmlinkage long sys_fallocate(int fd, int mode, loff_t offset, loff_t len);
 
diff --git a/kernel/hrtimer.c b/kernel/hrtimer.c
index 1069998..668f396 100644
--- a/kernel/hrtimer.c
+++ b/kernel/hrtimer.c
@@ -306,7 +306,7 @@ EXPORT_SYMBOL_GPL(ktime_sub_ns);
 /*
  * Divide a ktime value by a nanosecond value
  */
-unsigned long ktime_divns(const ktime_t kt, s64 div)
+u64 ktime_divns(const ktime_t kt, s64 div)
 {
 	u64 dclc, inc, dns;
 	int sft = 0;
@@ -321,7 +321,7 @@ unsigned long ktime_divns(const ktime_t kt, s64 div)
 	dclc >>= sft;
 	do_div(dclc, (unsigned long) div);
 
-	return (unsigned long) dclc;
+	return dclc;
 }
 #endif /* BITS_PER_LONG >= 64 */
 
@@ -656,10 +656,9 @@ void unlock_hrtimer_base(const struct hrtimer *timer, unsigned long *flags)
  * Forward the timer expiry so it will expire in the future.
  * Returns the number of overruns.
  */
-unsigned long
-hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
+u64 hrtimer_forward(struct hrtimer *timer, ktime_t now, ktime_t interval)
 {
-	unsigned long orun = 1;
+	u64 orun = 1;
 	ktime_t delta;
 
 	delta = ktime_sub(now, timer->expires);
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 36d563f..122d5c7 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -256,8 +256,9 @@ static void schedule_next_timer(struct k_itimer *timr)
 	if (timr->it.real.interval.tv64 == 0)
 		return;
 
-	timr->it_overrun += hrtimer_forward(timer, timer->base->get_time(),
-					    timr->it.real.interval);
+	timr->it_overrun += (unsigned int) hrtimer_forward(timer,
+						timer->base->get_time(),
+						timr->it.real.interval);
 
 	timr->it_overrun_last = timr->it_overrun;
 	timr->it_overrun = -1;
@@ -386,7 +387,7 @@ static enum hrtimer_restart posix_timer_fn(struct hrtimer *timer)
 					now = ktime_add(now, kj);
 			}
 #endif
-			timr->it_overrun +=
+			timr->it_overrun += (unsigned int)
 				hrtimer_forward(timer, now,
 						timr->it.real.interval);
 			ret = HRTIMER_RESTART;
@@ -662,7 +663,7 @@ common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
 	 */
 	if (iv.tv64 && (timr->it_requeue_pending & REQUEUE_PENDING ||
 	    (timr->it_sigev_notify & ~SIGEV_THREAD_ID) == SIGEV_NONE))
-		timr->it_overrun += hrtimer_forward(timer, now, iv);
+		timr->it_overrun += (unsigned int) hrtimer_forward(timer, now, iv);
 
 	remaining = ktime_sub(timer->expires, now);
 	/* Return 0 only, when the timer is expired and not pending */
diff --git a/kernel/sys_ni.c b/kernel/sys_ni.c
index beee5b3..5b9b467 100644
--- a/kernel/sys_ni.c
+++ b/kernel/sys_ni.c
@@ -154,7 +154,10 @@ cond_syscall(sys_ioprio_get);
 
 /* New file descriptors */
 cond_syscall(sys_signalfd);
-cond_syscall(sys_timerfd);
 cond_syscall(compat_sys_signalfd);
-cond_syscall(compat_sys_timerfd);
+cond_syscall(sys_timerfd_create);
+cond_syscall(sys_timerfd_settime);
+cond_syscall(sys_timerfd_gettime);
+cond_syscall(compat_sys_timerfd_settime);
+cond_syscall(compat_sys_timerfd_gettime);
 cond_syscall(sys_eventfd);