linux-kernel - Re: [PATCH] MIPS: Octeon: Mark octeon_wdt interrupt as IRQF_NO

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Message-ID: <4E8A51AC.8060905@cavium.com>
Date:	Mon, 03 Oct 2011 17:22:04 -0700
From:	Venkat Subbiah <venkat.subbiah@...ium.com>
To:	linux-mips@...ux-mips.org, ralf@...ux-mips.org,
	linux-watchdog@...r.kernel.org, linux-kernel@...r.kernel.org,
	Wim Van Sebroeck <wim@...ana.be>
CC:	linux-rt-users@...r.kernel.org, david.daney@...ium.com
Subject: Re: [PATCH] MIPS: Octeon: Mark octeon_wdt interrupt as IRQF_NO_THREAD

On 10/03/2011 04:30 PM, Venkat Subbiah wrote:
> This is to exclude it from force threading to allow RT patch set to work.
>
> The watchdog timers are per-CPU and the addresses of register that reset
> the timer are calculated based on the current CPU.  Therefore we cannot
> allow it to run on a thread on a different CPU.  Also we only do a
> single register write, which is much faster than scheduling a handler
> thread.
>
> And while on this line remove IRQF_DISABLED as this flag is a NOP.
>
>
> Signed-off-by: Venkat Subbiah<venkat.subbiah@...ium.com>
> Acked-by: David Daney<david.daney@...ium.com>
> ---
>   drivers/watchdog/octeon-wdt-main.c |    2 +-
>   1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/drivers/watchdog/octeon-wdt-main.c b/drivers/watchdog/octeon-wdt-main.c
> index 945ee83..7c0d863 100644
> --- a/drivers/watchdog/octeon-wdt-main.c
> +++ b/drivers/watchdog/octeon-wdt-main.c
> @@ -402,7 +402,7 @@ static void octeon_wdt_setup_interrupt(int cpu)
>   	irq = OCTEON_IRQ_WDOG0 + core;
>
>   	if (request_irq(irq, octeon_wdt_poke_irq,
> -			IRQF_DISABLED, "octeon_wdt", octeon_wdt_poke_irq))
> +			IRQF_NO_THREAD, "octeon_wdt", octeon_wdt_poke_irq))
>   		panic("octeon_wdt: Couldn't obtain irq %d", irq);
>
>   	cpumask_set_cpu(cpu,&irq_enabled_cpus);
Sending it to kernel watchdog maintainers. Forgot to include them in the prior email.

Thanks,
Venkat

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