linux-kernel - [PATCH v4 07/25] posix-timers:Change the implementation for timer

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Message-Id: <1433159727-4818-1-git-send-email-baolin.wang@linaro.org>
Date:	Mon,  1 Jun 2015 19:55:27 +0800
From:	Baolin Wang <baolin.wang@...aro.org>
To:	tglx@...utronix.de
Cc:	arnd@...db.de, linux-kernel@...r.kernel.org,
	baolin.wang@...aro.org, y2038@...ts.linaro.org
Subject: [PATCH v4 07/25] posix-timers:Change the implementation for timer_gettime syscall function

This patch splits out the guts of the timer_gettime syscall and changes the
timer_gettime syscall implementation to prepare the converting to 64bit methods
for the timer_gettime syscall function in posix-timers.c file.

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 kernel/time/posix-timers.c |   16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index 96efe1d..d00f8ed 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -795,11 +795,8 @@ common_timer_get(struct k_itimer *timr, struct itimerspec *cur_setting)
 		cur_setting->it_value = ktime_to_timespec(remaining);
 }
 
-/* Get the time remaining on a POSIX.1b interval timer. */
-SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
-		struct itimerspec __user *, setting)
+static int __timer_gettime(timer_t timer_id, struct itimerspec *cur_setting)
 {
-	struct itimerspec cur_setting;
 	struct k_itimer *timr;
 	struct k_clock *kc;
 	unsigned long flags;
@@ -813,9 +810,18 @@ SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
 	if (WARN_ON_ONCE(!kc || !kc->timer_get))
 		ret = -EINVAL;
 	else
-		kc->timer_get(timr, &cur_setting);
+		kc->timer_get(timr, cur_setting);
 
 	unlock_timer(timr, flags);
+	return ret;
+}
+
+/* Get the time remaining on a POSIX.1b interval timer. */
+SYSCALL_DEFINE2(timer_gettime, timer_t, timer_id,
+		struct itimerspec __user *, setting)
+{
+	struct itimerspec cur_setting;
+	int ret = __timer_gettime(timer_id, &cur_setting);
 
 	if (!ret && copy_to_user(setting, &cur_setting, sizeof (cur_setting)))
 		return -EFAULT;
-- 
1.7.9.5

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