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    SubjectRe: [patch 0/2] x86: NMI-safe trap handlers
    On Wed, Jul 14, 2010 at 01:08:05PM -0400, Mathieu Desnoyers wrote:
    > * Andi Kleen (andi@firstfloor.org) wrote:
    > > > x86_32 cannot use vmalloc_sync_all() to sychronize the TLBs from every
    > > > processes because the vmalloc area is mapped in a different address space for
    > >
    > > That doesn't make sense. vmalloc_all_sync() should work on 32bit too.
    > > It just needs to walk all processes and fix up every page table.
    >
    > Yeah, I've been taken aback when Tejun told me that a few moments ago. I
    > initially thought that vmalloc_sync_all() synchronized all page mappings of all
    > processes on x86_32. But apparently that does not seem to be the case. I'm
    > adding him in CC.

    Well it worked when it was originally written. That was for the case
    of a NMI handler in a module. If it doesn't work fix it. I don't
    think the NMI-safe fault is really needed with it.

    -Andi


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