linux-kernel - Re: [PATCH] irq: rename irq_desc() to to_irq_desc()

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Date:	Mon, 18 Aug 2008 17:48:56 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] irq: rename irq_desc() to to_irq_desc() - fix #3

On Mon, Aug 18, 2008 at 5:38 PM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Ingo Molnar <mingo@...e.hu> wrote:
>
>> * Yinghai Lu <yhlu.kernel@...il.com> wrote:
>>
>> > add create_irq_nr, and retore create_irq to old
>>
>> applied all 3 patches to tip/irq/sparseirq - thanks Yinghai!
>
> build fix for tip/master, from tip/x86/spinlocks. I merged that branch
> into tip/irq/sparseirq and applied this fix.
>
>        Ingo
>
> ------------>
> From 1f73df742c77472d2e14e47b8c568218952af1d7 Mon Sep 17 00:00:00 2001
> From: Ingo Molnar <mingo@...e.hu>
> Date: Tue, 19 Aug 2008 02:33:39 +0200
> Subject: [PATCH] irq: build fix
>
> fix:
>
>  arch/x86/xen/spinlock.c: In function 'xen_spin_lock_slow':
>  arch/x86/xen/spinlock.c:90: error: 'struct kernel_stat' has no member named 'irqs'
>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  arch/x86/xen/spinlock.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
>
> diff --git a/arch/x86/xen/spinlock.c b/arch/x86/xen/spinlock.c
> index 8dc4d31..dc21378 100644
> --- a/arch/x86/xen/spinlock.c
> +++ b/arch/x86/xen/spinlock.c
> @@ -87,7 +87,7 @@ static noinline int xen_spin_lock_slow(struct raw_spinlock *lock)
>
>        /* block until irq becomes pending */
>        xen_poll_irq(irq);
> -       kstat_this_cpu.irqs[irq]++;
> +       kstat_irqs_this_cpu(&irq_desc[irq])++;
>
>  out:
>        unspinning_lock(xl);
>

should be

kstat_irqs_this_cpu(to_irq_desc(irq))++;

otherwise when CONFIG_HAVE_SPARSE_IRQ is set, it will fail.

when sparse_irq is set, only have irq_descX list...

YH
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