lkml.org 
[lkml]   [2004]   [May]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH] ppc64: Fix possible race with set_pte on a present PTE


    On Tue, 25 May 2004, Andrea Arcangeli wrote:
    >
    > I expected the pal code to re-read the pte if the control bits asked for
    > page fault, like it must happen if the control bits are set to
    > non-present.

    That may or may not be true. I _think_ it wasn't true.

    > This latter this must be true or linux wouldn't run at all
    > on alpha.

    A "not-present" fault is a totally different fault from a "protection
    fault". Only the not-present fault ends up walking the page tables, if I
    remember correctly.

    The PAL-code sources are out there somewhere, so I guess this should be
    easy to check if I wasn't so lazy.

    Linus
    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2009-11-18 23:46    [W:4.895 / U:0.004 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site