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| author | Richard Cochran <richardcochran@gmail.com> | 2011-02-01 13:52:26 +0000 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2011-02-02 15:28:19 +0100 |
| commit | f1f1d5ebd10ffa4242bce7a90a56a222d6b7bc77 (patch) | |
| tree | ca04ea979512e0037c52bca855dbf050b1b08360 /kernel/compat.c | |
| parent | 65f5d80bdf83ec0d7f3887db10153bf3f36ed73c (diff) | |
| download | lwn-f1f1d5ebd10ffa4242bce7a90a56a222d6b7bc77.tar.gz lwn-f1f1d5ebd10ffa4242bce7a90a56a222d6b7bc77.zip | |
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.c | 23 |
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) { |