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    Subject[PATCH v5 1/5] drivers/clocksource/hyper-v: non ACPI support in hyperv clock
    Date
    Add a placeholder function for the hv_setup_stimer0_irq API to accommodate
    systems without ACPI support. Since this function is not utilized on
    x86/x64 systems and non-ACPI support is only intended for x86/x64 systems,
    a placeholder function is sufficient for now and can be improved upon if
    necessary in the future.

    Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
    Reviewed-by: Michael Kelley <mikelley@microsoft.com>
    ---
    drivers/clocksource/hyperv_timer.c | 15 +++++++++++++--
    1 file changed, 13 insertions(+), 2 deletions(-)

    diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
    index c0cef92b12b8..f32948c8a96f 100644
    --- a/drivers/clocksource/hyperv_timer.c
    +++ b/drivers/clocksource/hyperv_timer.c
    @@ -49,7 +49,7 @@ static bool direct_mode_enabled;

    static int stimer0_irq = -1;
    static int stimer0_message_sint;
    -static DEFINE_PER_CPU(long, stimer0_evt);
    +static __maybe_unused DEFINE_PER_CPU(long, stimer0_evt);

    /*
    * Common code for stimer0 interrupts coming via Direct Mode or
    @@ -68,7 +68,7 @@ EXPORT_SYMBOL_GPL(hv_stimer0_isr);
    * stimer0 interrupt handler for architectures that support
    * per-cpu interrupts, which also implies Direct Mode.
    */
    -static irqreturn_t hv_stimer0_percpu_isr(int irq, void *dev_id)
    +static irqreturn_t __maybe_unused hv_stimer0_percpu_isr(int irq, void *dev_id)
    {
    hv_stimer0_isr();
    return IRQ_HANDLED;
    @@ -196,6 +196,7 @@ void __weak hv_remove_stimer0_handler(void)
    {
    };

    +#ifdef CONFIG_ACPI
    /* Called only on architectures with per-cpu IRQs (i.e., not x86/x64) */
    static int hv_setup_stimer0_irq(void)
    {
    @@ -230,6 +231,16 @@ static void hv_remove_stimer0_irq(void)
    stimer0_irq = -1;
    }
    }
    +#else
    +static int hv_setup_stimer0_irq(void)
    +{
    + return 0;
    +}
    +
    +static void hv_remove_stimer0_irq(void)
    +{
    +}
    +#endif

    /* hv_stimer_alloc - Global initialization of the clockevent and stimer0 */
    int hv_stimer_alloc(bool have_percpu_irqs)
    --
    2.34.1
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