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    SubjectRe: start_kernel(): bug: interrupts were enabled early
    On Wed, 31 Mar 2010 23:26:52 -0700 "H. Peter Anvin" <hpa@zytor.com> wrote:

    > On 03/31/2010 03:26 PM, Andrew Morton wrote:
    > >
    > > Not by adding overhead to every single down_read()/down_write() just to
    > > fix a once-off startup problem - that's taking laziness way too far.
    > >
    >
    > How much overhead is this on non-x86 architectures (keep in mind x86
    > doesn't use this?)
    >

    Just a few instructions, I guess. But we can do it with zero.

    And from a design POV, pretending that down_read()/down_write() can be
    called with interrupts disabled is daft - they cannot! Why muck up the
    usual code paths with this startup-specific hack?



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