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    SubjectRe: [PATCH 01/15] mm: poison struct page for ptlock
    Ingo Molnar <mingo@elte.hu> wrote:
    >
    > yuck. What is the real problem btw?

    Well. One problem is that spinlocks now take two words...

    But apart from that, the problem at hand is that we want to embed a
    spinlock in struct page, and the size of the spinlock varies a lot according
    to config. The only >wordsize version we really care about is
    CONFIG_PREEMPT, NR_CPUS >= 4. (which distros don't ship...)

    > AFAICS there's enough space for a
    > 2-word spinlock in struct page for pagetables.

    spinlocks get a lot bigger than that with CONFIG_DEBUG_SPINLOCK.

    > We really dont want to
    > rewrite spinlocks (or remove features) just to keep gcc 2.95 supported
    > for some more time. In fact, is there any 2.6 based distro that uses gcc
    > 2.95?

    I think some of the debian derivates might. But who knows?
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