From: ben-linux@fluff.org (Ben Dooks)
To: linux-arm-kernel@lists.infradead.org
Subject: [RFC PATCH 3/3] [ARM] Allow boards to specify the exact number of IRQs needed
Date: Fri, 5 Feb 2010 08:14:14 +0000 [thread overview]
Message-ID: <20100205081413.GF13267@trinity.fluff.org> (raw)
In-Reply-To: <f17812d71002041112x6f8308b5q6bc37f6608a3efc9@mail.gmail.com>
On Thu, Feb 04, 2010 at 11:12:37AM -0800, Eric Miao wrote:
> commit 988a6a2bd322d83eba42c05cb6cb77a74cba056b
> Author: Eric Miao <eric.y.miao@gmail.com>
> Date: Thu Feb 4 11:06:35 2010 -0800
>
> [ARM] Allow boards to specify the exact number of IRQs needed
>
> This will only take effect if SPARSE_IRQ is enabled, any board that
> depends on this _only_ has to explicitly select SPARSE_IRQ.
>
> Signed-off-by: Eric Miao <eric.y.miao@gmail.com>
Is this going to cause errors when the core support tries to register
irq chips over the number that the board itself supports?
> diff --git a/arch/arm/include/asm/irq.h b/arch/arm/include/asm/irq.h
> index a1ea728..825ee34 100644
> --- a/arch/arm/include/asm/irq.h
> +++ b/arch/arm/include/asm/irq.h
> @@ -19,6 +19,7 @@
>
> #ifndef __ASSEMBLY__
> struct irqaction;
> +extern int arch_nr_irqs;
> extern void migrate_irqs(void);
>
> extern void asm_do_IRQ(unsigned int, struct pt_regs *);
> diff --git a/arch/arm/include/asm/mach/arch.h b/arch/arm/include/asm/mach/arch.h
> index c59842d..a9128b4 100644
> --- a/arch/arm/include/asm/mach/arch.h
> +++ b/arch/arm/include/asm/mach/arch.h
> @@ -20,6 +20,7 @@ struct machine_desc {
> * by assembler code in head.S, head-common.S
> */
> unsigned int nr; /* architecture number */
> + unsigned int num_irqs; /* number of IRQs */
> unsigned int phys_io; /* start of physical io */
> unsigned int io_pg_offst; /* byte offset for io
> * page tabe entry */
> diff --git a/arch/arm/kernel/irq.c b/arch/arm/kernel/irq.c
> index e62f39b..e23d248 100644
> --- a/arch/arm/kernel/irq.c
> +++ b/arch/arm/kernel/irq.c
> @@ -168,7 +168,7 @@ void __init init_IRQ(void)
> #ifdef CONFIG_SPARSE_IRQ
> int __init arch_probe_nr_irqs(void)
> {
> - nr_irqs = NR_IRQS;
> + nr_irqs = arch_nr_irqs ? arch_nr_irqs : NR_IRQS;
> return 0;
> }
> #endif
> diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
> index c6c57b6..803ed95 100644
> --- a/arch/arm/kernel/setup.c
> +++ b/arch/arm/kernel/setup.c
> @@ -755,6 +755,7 @@ void __init setup_arch(char **cmdline_p)
> /*
> * Set up various architecture-specific pointers
> */
> + arch_nr_irqs = mdesc->num_irqs;
> init_arch_irq = mdesc->init_irq;
> system_timer = mdesc->timer;
> init_machine = mdesc->init_machine;
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
--
--
Ben
Q: What's a light-year?
A: One-third less calories than a regular year.
next prev parent reply other threads:[~2010-02-05 8:14 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-02-04 19:12 [RFC PATCH 3/3] [ARM] Allow boards to specify the exact number of IRQs needed Eric Miao
2010-02-05 8:14 ` Ben Dooks [this message]
2010-02-05 8:30 ` Ben Dooks
2010-02-05 9:50 ` Eric Miao
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