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    Subject[PATCH 05/12] xen/pvclock: add monotonicity check
    Date
    Other tsc-based clocksources add a monotonicity test to make sure there's
    no regression in the returned cycles.

    Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
    ---
    arch/x86/xen/time.c | 7 ++++++-
    1 files changed, 6 insertions(+), 1 deletions(-)

    diff --git a/arch/x86/xen/time.c b/arch/x86/xen/time.c
    index 0a5aa44..00f06cc 100644
    --- a/arch/x86/xen/time.c
    +++ b/arch/x86/xen/time.c
    @@ -213,9 +213,14 @@ cycle_t xen_clocksource_read(void)
    return ret;
    }

    +static struct clocksource xen_clocksource;
    +
    static cycle_t xen_clocksource_get_cycles(struct clocksource *cs)
    {
    - return xen_clocksource_read();
    + cycle_t ret = xen_clocksource_read();
    +
    + return ret >= xen_clocksource.cycle_last ?
    + ret : xen_clocksource.cycle_last;
    }

    static void xen_read_wallclock(struct timespec *ts)
    --
    1.6.2.5


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