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From: Baolin Wang <baolin.wang@linaro.org>
To: tglx@linutronix.de
Cc: arnd@arndb.de, linux-kernel@vger.kernel.org, baolin.wang@linaro.org,
        y2038@lists.linaro.org
Subject: [PATCH v5 10/24] posix-timers: Factor out the guts of 'clock_settime' for reusing
Date: Fri, 12 Jun 2015 15:48:25 +0800
Message-Id: <86d96792c8550430ad18c86686407c00cb1ccaa6.1434079263.git.baolin.wang@linaro.org>
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In order to reuse the very same logic for the year 2038 safe syscalls
which we need to introduce for 32bit system, factor out the guts of
the 'clock_settime' syscall.

Signed-off-by: Baolin Wang <baolin.wang@linaro.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 778610c..65610ac 100644
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1089,19 +1089,25 @@ 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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