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    Subject[tip:sched/core] sched: Fix hrtick_start() on UP
    Commit-ID:  868933359a3bdda25b562e9d41bce7071edc1b08
    Gitweb: http://git.kernel.org/tip/868933359a3bdda25b562e9d41bce7071edc1b08
    Author: Wanpeng Li <wanpeng.li@linux.intel.com>
    AuthorDate: Wed, 26 Nov 2014 08:44:06 +0800
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Wed, 4 Feb 2015 07:52:28 +0100

    sched: Fix hrtick_start() on UP

    The commit 177ef2a6315e ("sched/deadline: Fix a precision problem in
    the microseconds range") forgot to change the UP version of
    hrtick_start(), do so now.

    Signed-off-by: Wanpeng Li <wanpeng.li@linux.intel.com>
    Fixes: 177ef2a6315e ("sched/deadline: Fix a precision problem in the microseconds range")
    [ Fixed the changelog. ]
    Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Juri Lelli <juri.lelli@arm.com>
    Cc: Kirill Tkhai <ktkhai@parallels.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Link: http://lkml.kernel.org/r/1416962647-76792-7-git-send-email-wanpeng.li@linux.intel.com
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    kernel/sched/core.c | 5 +++++
    1 file changed, 5 insertions(+)

    diff --git a/kernel/sched/core.c b/kernel/sched/core.c
    index d59652d..5091fd4 100644
    --- a/kernel/sched/core.c
    +++ b/kernel/sched/core.c
    @@ -492,6 +492,11 @@ static __init void init_hrtick(void)
    */
    void hrtick_start(struct rq *rq, u64 delay)
    {
    + /*
    + * Don't schedule slices shorter than 10000ns, that just
    + * doesn't make sense. Rely on vruntime for fairness.
    + */
    + delay = max_t(u64, delay, 10000LL);
    __hrtimer_start_range_ns(&rq->hrtick_timer, ns_to_ktime(delay), 0,
    HRTIMER_MODE_REL_PINNED, 0);
    }

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