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authorRichard Cochran <richardcochran@gmail.com>2011-02-01 13:52:26 +0000
committerThomas Gleixner <tglx@linutronix.de>2011-02-02 15:28:19 +0100
commitf1f1d5ebd10ffa4242bce7a90a56a222d6b7bc77 (patch)
treeca04ea979512e0037c52bca855dbf050b1b08360 /kernel/compat.c
parent65f5d80bdf83ec0d7f3887db10153bf3f36ed73c (diff)
downloadlinux-sh-f1f1d5ebd10ffa4242bce7a90a56a222d6b7bc77.tar.gz
posix-timers: Introduce a syscall for clock tuning.
A new syscall is introduced that allows tuning of a POSIX clock. The new call, clock_adjtime, takes two parameters, the clock ID and a pointer to a struct timex. Any ADJTIMEX(2) operation may be requested via this system call, but various POSIX clocks may or may not support tuning. [ tglx: Adapted to the posix-timer cleanup series. Avoid copy_to_user in the error case ] Signed-off-by: Richard Cochran <richard.cochran@omicron.at> Acked-by: John Stultz <johnstul@us.ibm.com> LKML-Reference: <20110201134419.869804645@linutronix.de> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/compat.c')
-rw-r--r--kernel/compat.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/compat.c b/kernel/compat.c
index 449e853cf41d..38b1d2c1cbe8 100644
--- a/kernel/compat.c
+++ b/kernel/compat.c
@@ -675,6 +675,29 @@ long compat_sys_clock_gettime(clockid_t which_clock,
return err;
}
+long compat_sys_clock_adjtime(clockid_t which_clock,
+ struct compat_timex __user *utp)
+{
+ struct timex txc;
+ mm_segment_t oldfs;
+ int err, ret;
+
+ err = compat_get_timex(&txc, utp);
+ if (err)
+ return err;
+
+ oldfs = get_fs();
+ set_fs(KERNEL_DS);
+ ret = sys_clock_adjtime(which_clock, (struct timex __user *) &txc);
+ set_fs(oldfs);
+
+ err = compat_put_timex(utp, &txc);
+ if (err)
+ return err;
+
+ return ret;
+}
+
long compat_sys_clock_getres(clockid_t which_clock,
struct compat_timespec __user *tp)
{