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    [PATCH] genirq: msi: simplify the msi irq limit policy · 92db6d10
    Eric W. Biederman 提交于
    Currently we attempt to predict how many irqs we will be able to allocate with
    msi using pci_vector_resources and some complicated accounting, and then we
    only allow each device as many irqs as we think are available on average.
    
    Only the s2io driver even takes advantage of this feature all other drivers
    have a fixed number of irqs they need and bail if they can't get them.
    
    pci_vector_resources is inaccurate if anyone ever frees an irq.  The whole
    implmentation is racy.  The current irq limit policy does not appear to make
    sense with current drivers.  So I have simplified things.  We can revisit this
    we we need a more sophisticated policy.
    Signed-off-by: NEric W. Biederman <ebiederm@xmission.com>
    Cc: Ingo Molnar <mingo@elte.hu>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
    Cc: Rajesh Shah <rajesh.shah@intel.com>
    Cc: Andi Kleen <ak@muc.de>
    Cc: "Protasevich, Natalie" <Natalie.Protasevich@UNISYS.com>
    Cc: "Luck, Tony" <tony.luck@intel.com>
    Signed-off-by: NAndrew Morton <akpm@osdl.org>
    Signed-off-by: NLinus Torvalds <torvalds@osdl.org>
    92db6d10
irq.c 31.2 KB