Re: [PATCH]: Handling spurious page fault for hugetlb region for 2.6.14-rc4-git5

[Tony Luck]

On 10/19/05, Linus Torvalds <torvalds@xxxxxxxx> wrote:
> (Of course, you can and maybe do handle it differently: you can also
> decide to just take the TLB fault, and flush the TLB at fault time in your
> handler. I don't see that either on ia64, though. Although I didn't look
> into any of the asm code, so maybe it's hidden somewhere there).

Yes.  In arch/ia64/kernel/ivt.S:

ENTRY(page_not_present)
        DBG_FAULT(20)
        mov r16=cr.ifa
        rsm psr.dt
        /*
         * The Linux page fault handler doesn't expect non-present
pages to be in
         * the TLB.  Flush the existing entry now, so we meet that expectation.
         */
        mov r17=PAGE_SHIFT<<2
        ;;
        ptc.l r16,r17

-Tony
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