linux-kernel - [PATCH v3 08/22] posix-timers:Split out the guts of the syscall and change the implementation for clock

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Message-Id: <1431342970-29683-1-git-send-email-baolin.wang@linaro.org>
Date:	Mon, 11 May 2015 19:16:10 +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 v3 08/22] posix-timers:Split out the guts of the syscall and change the implementation for clock_settime

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

Signed-off-by: Baolin Wang <baolin.wang@...aro.org>
---
 kernel/time/posix-timers.c |   14 ++++++++++----
 1 file changed, 10 insertions(+), 4 deletions(-)

diff --git a/kernel/time/posix-timers.c b/kernel/time/posix-timers.c
index f2fde32..dcc35fc 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1072,19 +1072,25 @@ void exit_itimers(struct signal_struct *sig)
 	}
 }
 
-SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
-		const struct timespec __user *, tp)
+static int __clock_settime(clockid_t which_clock, struct timespec *ts)
 {
 	struct k_clock *kc = clockid_to_kclock(which_clock);
-	struct timespec new_tp;
 
 	if (!kc || !kc->clock_set)
 		return -EINVAL;
 
+	return kc->clock_set(which_clock, ts);
+}
+
+SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
+		const struct timespec __user *, tp)
+{
+	struct timespec new_tp;
+
 	if (copy_from_user(&new_tp, tp, sizeof (*tp)))
 		return -EFAULT;
 
-	return kc->clock_set(which_clock, &new_tp);
+	return __clock_settime(which_clock, &new_tp);
 }
 
 SYSCALL_DEFINE2(clock_gettime, const clockid_t, which_clock,
-- 
1.7.9.5

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