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DateThu, 4 Nov 2010 20:28:53 +0100
FromRichard Cochran <>
Subject[PATCH RFC 3/8] clock device: convert clock_getres
This patch lets the clock_getres system call use dynamic clock devices.

Signed-off-by: Richard Cochran <richard.cochran@omicron.at>
---
include/linux/posix-timers.h | 1 +
kernel/posix-timers.c | 3 +--
kernel/time/clockdevice.c | 27 +++++++++++++++++++++++++++
3 files changed, 29 insertions(+), 2 deletions(-)
diff --git a/include/linux/posix-timers.h b/include/linux/posix-timers.h
index 70f40e6..7d6a4f0 100644
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -137,5 +137,6 @@ long clock_nanosleep_restart(struct restart_block *restart_block);
void update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);

int posix_clock_gettime(const clockid_t clock, struct timespec __user *tp);
+int posix_clock_getres(const clockid_t clock, struct timespec __user *tp);

#endif
diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 4aecbfa..baa6a2e 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -969,8 +969,7 @@ int posix_clock_gettime(const clockid_t which_clock,

}

-SYSCALL_DEFINE2(clock_getres, const clockid_t, which_clock,
- struct timespec __user *, tp)
+int posix_clock_getres(const clockid_t which_clock, struct timespec __user *tp)
{
struct timespec rtn_tp;
int error;
diff --git a/kernel/time/clockdevice.c b/kernel/time/clockdevice.c
index e80117b..6629ae7 100644
--- a/kernel/time/clockdevice.c
+++ b/kernel/time/clockdevice.c
@@ -211,3 +211,30 @@ SYSCALL_DEFINE2(clock_gettime,
mutex_unlock(&clk->mux);
return err;
}
+
+SYSCALL_DEFINE2(clock_getres,
+ const clockid_t, id, struct timespec __user *, user_ts)
+{
+ struct timespec ts;
+ struct clock_device *clk;
+ int err;
+
+ clk = clockid_to_clock_device(id);
+ if (!clk)
+ return posix_clock_getres(id, user_ts);
+
+ mutex_lock(&clk->mux);
+
+ if (clk->zombie)
+ err = -ENODEV;
+ else if (!clk->ops->clock_getres)
+ err = -EOPNOTSUPP;
+ else
+ err = clk->ops->clock_getres(clk->priv, &ts);
+
+ if (!err && user_ts && copy_to_user(user_ts, &ts, sizeof(ts)))
+ err = -EFAULT;
+
+ mutex_unlock(&clk->mux);
+ return err;
+}
--
1.7.0.4


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