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    SubjectRe: [PATCH] ata: Don't use NO_IRQ in pata_of_platform driver
    On Tue, Dec 6, 2011 at 11:46, Russell King - ARM Linux
    <> wrote:
    > But.. let's make one thing clear: Alan Cox and Linus have been going on
    > about how IRQ0 should not be used.  Let's be crystal clear: even x86
    > uses IRQ0.  It happens to be the PIC timer, and that gets claimed early
    > on during the x86 boot.  So please don't tell me that x86 avoids IRQ0.
    > It doesn't.  It just happens that x86 never shows IRQ0 to anything but
    > the i8253 PIC driver.

    It's shown in /proc/interrupts due to a "bug" in show_interrupts().
    The (gmail damaged) patch below fixes this bug.

    From 46f51a2d42548358868a34df00c2a4e47bbdf691 Mon Sep 17 00:00:00 2001
    From: Geert Uytterhoeven <>
    Date: Tue, 6 Dec 2011 11:55:05 +0100
    Subject: [PATCH] /proc/interrupts: irq zero is invalid

    As zero is an invalid irq number, show_interrupts() should not try to
    print it. Just return after printing the header for i == 0.

    Signed-off-by: Geert Uytterhoeven <>
    kernel/irq/proc.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/kernel/irq/proc.c b/kernel/irq/proc.c
    index 4bd4faa..5b8bbf0 100644
    --- a/kernel/irq/proc.c
    +++ b/kernel/irq/proc.c
    @@ -439,6 +439,7 @@ int show_interrupts(struct seq_file *p, void *v)
    seq_printf(p, "CPU%-8d", j);
    seq_putc(p, '\n');
    + return 0;

    desc = irq_to_desc(i);

    Geert Uytterhoeven -- There's lots of Linux beyond ia32 --

    In personal conversations with technical people, I call myself a hacker. But
    when I'm talking to journalists I just say "programmer" or something like that.
                                    -- Linus Torvalds
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