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    SubjectRe: 2.3.43-pre[25] do not work with HIGHMEM=64GB
    Ingo Molnar wrote:
    > On Wed, 9 Feb 2000, Manfred Spraul wrote:
    > > > Unable to handle kernel NULL pointer dereference at virtual addres
    > > > s 00000088
    > > > *pde = 00104001
    > > Strange. Ingo reported the same problem. [...]
    > this one is definitely fixed in pre5. (with directed APIC broadcasts it's
    > not possible to hit an uninitialized CPU)

    I would prefer if we explicitly initialize cpu_tlbstate during cpu_init:
    it's cleaner, and it prevents any ordering problems within switch_mm()
    [there is a tiny race, around 30 instructions]

    Do you have any further crashes due to the tlb changes? I was running
    with my debug patches without any special messages.

    Oh. Are you using gcc-2.95? I forgot to mark the cpu_tlbstate array as
    volatile [arch/i386/kernel/smp.c and include/asm/pgalloc.h], could you
    change that?


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