linux-kernel - Re: [PATCH 12/15] SH: kill off set_irq

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Date:	Tue, 7 Jul 2015 09:53:39 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Rob Herring <robh@...nel.org>
Cc:	Russell King <linux@....linux.org.uk>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	arm@...nel.org, Magnus Damm <magnus.damm@...il.com>,
	linux-sh@...r.kernel.org
Subject: Re: [PATCH 12/15] SH: kill off set_irq_flags usage

On Tue, Jun 09, 2015 at 01:26:38PM -0500, Rob Herring wrote:
> set_irq_flags is ARM specific with custom flags which have genirq
> equivalents. Convert drivers to use the genirq interfaces directly, so we
> can kill off set_irq_flags. The translation of flags is as follows:
> 
> IRQF_VALID -> !IRQ_NOREQUEST
> IRQF_PROBE -> !IRQ_NOPROBE
> IRQF_NOAUTOEN -> IRQ_NOAUTOEN
> 
> For IRQs managed by an irqdomain, the irqdomain core code handles clearing
> and setting IRQ_NOREQUEST already, so there is no need to do this in
> .map() functions and we can simply remove the set_irq_flags calls. Some
> users also set IRQ_NOPROBE and this has been maintained although it is not
> clear that is really needed. There appears to be a great deal of blind
> copy and paste of this code.
> 
> Signed-off-by: Rob Herring <robh@...nel.org>
> Cc: Simon Horman <horms@...ge.net.au>
> Cc: Magnus Damm <magnus.damm@...il.com>
> Cc: linux-sh@...r.kernel.org

I am trusting the description above coupled with the comments in
the original code (that this patch removes). Assuming those ducks are
aligned:

Acked-by: Simon Horman <horms+renesas@...ge.net.au>

> ---
>  drivers/sh/intc/internals.h | 10 +---------
>  1 file changed, 1 insertion(+), 9 deletions(-)
> 
> diff --git a/drivers/sh/intc/internals.h b/drivers/sh/intc/internals.h
> index 7dff08e..897ffb1 100644
> --- a/drivers/sh/intc/internals.h
> +++ b/drivers/sh/intc/internals.h
> @@ -99,15 +99,7 @@ static inline struct intc_desc_int *get_intc_desc(unsigned int irq)
>   */
>  static inline void activate_irq(int irq)
>  {
> -#ifdef CONFIG_ARM
> -	/* ARM requires an extra step to clear IRQ_NOREQUEST, which it
> -	 * sets on behalf of every irq_chip.  Also sets IRQ_NOPROBE.
> -	 */
> -	set_irq_flags(irq, IRQF_VALID);
> -#else
> -	/* same effect on other architectures */
> -	irq_set_noprobe(irq);
> -#endif
> +	irq_clear_status_flags(irq, IRQ_NOREQUEST | IRQ_NOPROBE);
>  }
>  
>  static inline int intc_handle_int_cmp(const void *a, const void *b)
> -- 
> 2.1.0
> 
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