linux-kernel - [PATCH v4 13/25] posix-timers:Change the implementation for clock

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Date:	Mon,  1 Jun 2015 19:57:24 +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 13/25] posix-timers:Change the implementation for clock_gettime syscall function

This patch splits out the guts of the clock_gettime syscall and
changes the clock_gettime syscall implementation to prepare the
converting to 64bit methods for the clock_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 06e2549..12affd5 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1117,17 +1117,23 @@ SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
 	return __clock_settime(which_clock, &new_tp);
 }
 
-SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
-		struct timespec __user *,tp)
+static int __clock_gettime(clockid_t which_clock, struct timespec *ts)
 {
 	struct k_clock *kc = clockid_to_kclock(which_clock);
-	struct timespec kernel_tp;
-	int error;
 
 	if (!kc)
 		return -EINVAL;
 
-	error = kc->clock_get(which_clock, &kernel_tp);
+	return kc->clock_get(which_clock, ts);
+}
+
+SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
+		struct timespec __user *,tp)
+{
+	struct timespec kernel_tp;
+	int error;
+
+	error = __clock_gettime(which_clock, &kernel_tp);
 
 	if (!error && copy_to_user(tp, &kernel_tp, sizeof (kernel_tp)))
 		error = -EFAULT;
-- 
1.7.9.5

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