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    Subject[tip:timers/core] hrtimer: Move copyout of remaining time to do_nanosleep()
    Commit-ID:  a7602681fc63f1a3ddd3da336296c9634c2ff974
    Gitweb: http://git.kernel.org/tip/a7602681fc63f1a3ddd3da336296c9634c2ff974
    Author: Al Viro <viro@ZenIV.linux.org.uk>
    AuthorDate: Wed, 7 Jun 2017 09:42:29 +0100
    Committer: Thomas Gleixner <tglx@linutronix.de>
    CommitDate: Wed, 14 Jun 2017 00:00:41 +0200

    hrtimer: Move copyout of remaining time to do_nanosleep()

    The hrtimer nanosleep() implementation can be simplified by moving the copy
    out of the remaining time to do_nanosleep() which is shared between the
    real nanosleep function and the restart function.

    The pointer to the timespec64 which is updated is already stored in the
    restart block at the call site, so the seperate handling of nanosleep and
    restart function can be avoided.

    [ tglx: Added changelog ]

    Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    Cc: John Stultz <john.stultz@linaro.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/20170607084241.28657-4-viro@ZenIV.linux.org.uk

    ---
    kernel/time/hrtimer.c | 62 +++++++++++++++++----------------------------------
    1 file changed, 20 insertions(+), 42 deletions(-)

    diff --git a/kernel/time/hrtimer.c b/kernel/time/hrtimer.c
    index 4ae777f..baa7b84 100644
    --- a/kernel/time/hrtimer.c
    +++ b/kernel/time/hrtimer.c
    @@ -1441,6 +1441,7 @@ EXPORT_SYMBOL_GPL(hrtimer_init_sleeper);

    static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mode)
    {
    + struct timespec __user *rmtp;
    hrtimer_init_sleeper(t, current);

    do {
    @@ -1457,48 +1458,33 @@ static int __sched do_nanosleep(struct hrtimer_sleeper *t, enum hrtimer_mode mod

    __set_current_state(TASK_RUNNING);

    - return t->task == NULL;
    -}
    -
    -static int update_rmtp(struct hrtimer *timer, struct timespec __user *rmtp)
    -{
    - struct timespec rmt;
    - ktime_t rem;
    -
    - rem = hrtimer_expires_remaining(timer);
    - if (rem <= 0)
    + if (!t->task)
    return 0;
    - rmt = ktime_to_timespec(rem);

    - if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
    - return -EFAULT;
    -
    - return 1;
    + rmtp = current->restart_block.nanosleep.rmtp;
    + if (rmtp) {
    + struct timespec rmt;
    + ktime_t rem = hrtimer_expires_remaining(&t->timer);
    + if (rem <= 0)
    + return 0;
    + rmt = ktime_to_timespec(rem);
    +
    + if (copy_to_user(rmtp, &rmt, sizeof(*rmtp)))
    + return -EFAULT;
    + }
    + return -ERESTART_RESTARTBLOCK;
    }

    long __sched hrtimer_nanosleep_restart(struct restart_block *restart)
    {
    struct hrtimer_sleeper t;
    - struct timespec __user *rmtp;
    - int ret = 0;
    + int ret;

    hrtimer_init_on_stack(&t.timer, restart->nanosleep.clockid,
    HRTIMER_MODE_ABS);
    hrtimer_set_expires_tv64(&t.timer, restart->nanosleep.expires);

    - if (do_nanosleep(&t, HRTIMER_MODE_ABS))
    - goto out;
    -
    - rmtp = restart->nanosleep.rmtp;
    - if (rmtp) {
    - ret = update_rmtp(&t.timer, rmtp);
    - if (ret <= 0)
    - goto out;
    - }
    -
    - /* The other values in restart are already filled in */
    - ret = -ERESTART_RESTARTBLOCK;
    -out:
    + ret = do_nanosleep(&t, HRTIMER_MODE_ABS);
    destroy_hrtimer_on_stack(&t.timer);
    return ret;
    }
    @@ -1506,8 +1492,7 @@ out:
    long hrtimer_nanosleep(struct timespec64 *rqtp,
    const enum hrtimer_mode mode, const clockid_t clockid)
    {
    - struct restart_block *restart = &current->restart_block;
    - struct timespec __user *rmtp;
    + struct restart_block *restart;
    struct hrtimer_sleeper t;
    int ret = 0;
    u64 slack;
    @@ -1518,7 +1503,8 @@ long hrtimer_nanosleep(struct timespec64 *rqtp,

    hrtimer_init_on_stack(&t.timer, clockid, mode);
    hrtimer_set_expires_range_ns(&t.timer, timespec64_to_ktime(*rqtp), slack);
    - if (do_nanosleep(&t, mode))
    + ret = do_nanosleep(&t, mode);
    + if (ret != -ERESTART_RESTARTBLOCK)
    goto out;

    /* Absolute timers do not update the rmtp value and restart: */
    @@ -1527,18 +1513,10 @@ long hrtimer_nanosleep(struct timespec64 *rqtp,
    goto out;
    }

    - rmtp = restart->nanosleep.rmtp;
    - if (rmtp) {
    - ret = update_rmtp(&t.timer, rmtp);
    - if (ret <= 0)
    - goto out;
    - }
    -
    + restart = &current->restart_block;
    restart->fn = hrtimer_nanosleep_restart;
    restart->nanosleep.clockid = t.timer.base->clockid;
    restart->nanosleep.expires = hrtimer_get_expires_tv64(&t.timer);
    -
    - ret = -ERESTART_RESTARTBLOCK;
    out:
    destroy_hrtimer_on_stack(&t.timer);
    return ret;
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