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    SubjectRe: new IRQ scalability changes in 2.3.48
    On Sun, Mar 19, 2000 at 10:28:14AM -0800, Linus Torvalds wrote:
    > On Sun, 19 Mar 2000, Rogier Wolff wrote:
    > >
    > > How about making "preemptive kernel" a "default-on" option on 2.4pre
    > > and a "default-off" option on the real 2.4 kernel?
    > No, it's definitely too experimental - there are places that play games
    > with the irq state etc, so there can be things that need quite a lot of
    > debugging to get the threaded-UP case working fine.
    > Maybe during 2.5.x we can back-port the changes to a 2.4.x release, and
    > give people a three-way choice: UP, threaded-UP or SMP. But it's not a
    > 2.4.x development thing.
    > Linus

    Does this mean that we are going to have yet another permutation of
    the binary interface? (Not that I personally really mind, although I
    can see that it would be convenient to export certain inlined functions
    that are different between UP and SMP (and RTLinux).)


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