[Bug 36222] kvm: 100% CPU usage after 3.0.0-rc1 guest shutdown

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https://bugzilla.kernel.org/show_bug.cgi?id=36222





--- Comment #12 from Török Edwin <edwintorok@gmail.com>  2011-05-30 12:26:19 ---
Bisection tells me this is the offending commit (see below), but I see you
found it too.

commit 349c004e3d31fda23ad225b61861be38047fff16
Author: Christoph Lameter <cl@linux.com>
Date:   Sat Mar 12 12:50:10 2011 +0100

    x86: A fast way to check capabilities of the current cpu

    Add this_cpu_has() which determines if the current cpu has a certain
    ability using a segment prefix and a bit test operation.

    For that we need to add bit operations to x86s percpu.h.

    Many uses of cpu_has use a pointer passed to a function to determine
    the current flags. That is no longer necessary after this patch.

    However, this patch only converts the straightforward cases where
    cpu_has is used with this_cpu_ptr. The rest is work for later.

    -tj: Rolled up patch to add x86_ prefix and use percpu_read() instead
         of percpu_read_stable().

    Signed-off-by: Christoph Lameter <cl@linux.com>
    Acked-by: Tejun Heo <tj@kernel.org>
    Signed-off-by: Tejun Heo <tj@kernel.org>

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