[Crash-utility] [PATCH] Display "irqaction mask" only if available

[Bernhard Walle]

Display "irqaction mask" only if available

The member "mask" has been removed from "struct irqaction" in the kernel per

    commit ef79f8e191722dbc1fc33bdfc448f572266c37e9
    Author: Rusty Russell <rusty at rustcorp.com.au>
    Date:   Thu Sep 24 09:34:37 2009 -0600

    cpumask: remove unused mask field from struct irqaction.

    Up until 1.1.83, the primitive human tribes used struct sigaction for
    interrupts.  The sa_mask field was overloaded to hold a pointer to the
    name.

    When someone created the new "struct irqaction" they carried across
    the "mask" field as a kind of ancestor worship: the fact that it was
    unused makes clear its spiritual significance.

    Signed-off-by: Rusty Russell <rusty at rustcorp.com.au>

This patch only displays the "irqaction mask" in the "irq" command if the
member is present.  It fixes the following error (kernel was 2.6.33):

    crash> irq

    irq: invalid structure member offset: irqaction_mask
	 FILE: kernel.c  LINE: 5001  FUNCTION: generic_dump_irq()

    [./crash.orig] error trace: 8097e44 => 8109541 => 810c0ec => 8156299


Signed-off-by: Bernhard Walle <bernhard at bwalle.de>

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