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    Subject[patch 21/29] x86/hpet: Add function to select a /dev/hpet channel
    If CONFIG_HPET=y is enabled the x86 specific HPET code should reserve at
    least one channel for the /dev/hpet character device, so that not all
    channels are absorbed for per CPU clockevent devices.

    Create a function to assign HPET_MODE_DEVICE so the rework of the
    clockevents allocation code can utilize the mode information instead of
    reducing the number of evaluated channels by #ifdef hackery.

    The function is not yet used, but provided as a separate patch for ease of
    review. It will be used when the rework of the clockevent selection takes
    place.

    Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
    ---
    arch/x86/kernel/hpet.c | 17 +++++++++++++++++
    1 file changed, 17 insertions(+)

    --- a/arch/x86/kernel/hpet.c
    +++ b/arch/x86/kernel/hpet.c
    @@ -228,8 +228,25 @@ static void __init hpet_reserve_platform
    hpet_alloc(&hd);

    }
    +
    +static void __init hpet_select_device_channel(void)
    +{
    + int i;
    +
    + for (i = 0; i < hpet_base.nr_channels; i++) {
    + struct hpet_channel *hc = hpet_base.channels + i;
    +
    + /* Associate the first unused channel to /dev/hpet */
    + if (hc->mode == HPET_MODE_UNUSED) {
    + hc->mode = HPET_MODE_DEVICE;
    + return;
    + }
    + }
    +}
    +
    #else
    static inline void hpet_reserve_platform_timers(void) { }
    +static inline void hpet_select_device_channel(void) {}
    #endif

    /* Common HPET functions */

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