[Xen-devel] Re: [PATCH 1/4] irq: Add new IRQ flag IRQF_NO_SUSPEND

[Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>]

On Thu, 2010-07-29 at 11:16 +0100, Ian Campbell wrote:
> A small number of users of IRQF_TIMER are using it for the implied no
> suspend behaviour on interrupts which are not timer interrupts.
> 
> Therefore add a new IRQF_NO_SUSPEND flag, rename IRQF_TIMER to
> __IRQF_TIMER and redefine IRQF_TIMER in terms of these new flags.
> 
> Signed-off-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
> Cc: Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>

Acked-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
> Cc: Paul Mackerras <paulus@xxxxxxxxx>
> Cc: Grant Likely <grant.likely@xxxxxxxxxxxx>
> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx
> Cc: linux-input@xxxxxxxxxxxxxxx
> Cc: linuxppc-dev@xxxxxxxxxx
> Cc: devicetree-discuss@xxxxxxxxxxxxxxxx
> ---
>  include/linux/interrupt.h |    7 ++++++-
>  kernel/irq/manage.c       |    2 +-
>  2 files changed, 7 insertions(+), 2 deletions(-)
> 
> diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
> index c233113..a0384a4 100644
> --- a/include/linux/interrupt.h
> +++ b/include/linux/interrupt.h
> @@ -53,16 +53,21 @@
>   * IRQF_ONESHOT - Interrupt is not reenabled after the hardirq handler 
> finished.
>   *                Used by threaded interrupts which need to keep the
>   *                irq line disabled until the threaded handler has been run.
> + * IRQF_NO_SUSPEND - Do not disable this IRQ during suspend
> + *
>   */
>  #define IRQF_DISABLED                0x00000020
>  #define IRQF_SAMPLE_RANDOM   0x00000040
>  #define IRQF_SHARED          0x00000080
>  #define IRQF_PROBE_SHARED    0x00000100
> -#define IRQF_TIMER           0x00000200
> +#define __IRQF_TIMER         0x00000200
>  #define IRQF_PERCPU          0x00000400
>  #define IRQF_NOBALANCING     0x00000800
>  #define IRQF_IRQPOLL         0x00001000
>  #define IRQF_ONESHOT         0x00002000
> +#define IRQF_NO_SUSPEND              0x00004000
> +
> +#define IRQF_TIMER           (__IRQF_TIMER | IRQF_NO_SUSPEND)
>  
>  /*
>   * Bits used by threaded handlers:
> diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c
> index e149748..c3003e9 100644
> --- a/kernel/irq/manage.c
> +++ b/kernel/irq/manage.c
> @@ -216,7 +216,7 @@ static inline int setup_affinity(unsigned int irq, struct 
> irq_desc *desc)
>  void __disable_irq(struct irq_desc *desc, unsigned int irq, bool suspend)
>  {
>       if (suspend) {
> -             if (!desc->action || (desc->action->flags & IRQF_TIMER))
> +             if (!desc->action || (desc->action->flags & IRQF_NO_SUSPEND))
>                       return;
>               desc->status |= IRQ_SUSPENDED;
>       }



_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel