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    SubjectRe: [PATCH 0/5] i387: stable kernel backport
    On Thu, Feb 23, 2012 at 02:38:42PM -0800, Linus Torvalds wrote:
    > On Thu, Feb 23, 2012 at 2:27 PM, Willy Tarreau <> wrote:
    > >
    > > OK so indeed I will only be able to check that it boots :-/
    > Well, we could do some trivial test-harness that just forces the issue
    > with regular timer interrupts (and even without AES-NI). I think Peter
    > talked about that when we were trying to hunt it down - but I think he
    > was then able to reproduce the problem without anything special and we
    > dropped it.
    > Essentially, just doing something like
    > if (irq_fpu_usable()) {
    > kernel_fpu_begin();
    > kernel_fpu_end();
    > }
    > in do_irq() and do_softirq() would stress-test things even without
    > wireless, and even without AES-NI.


    > You'd still need an x86-32 machine to test on, because x86-64 was
    > immune to this issue.
    > But yeah, the impact of this seems to be small enough that for older
    > kernels (which are likely used on older systems for maintenance
    > anyway) disabling AES-NI on x86-32 really might be the way to go.

    I agree. I don't know anybody using AES-NI on purpose on older x86-32


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