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    SubjectRe: [PATCH 1/8] badpage: simplify page_alloc flag check+clear
    On Tue, 2 Dec 2008, Christoph Lameter wrote:
    > On Tue, 2 Dec 2008, Hugh Dickins wrote:
    > > > But they are always clear on free. The checking is irrelevant.
    > >
    > Strange name.

    Looks like I'm not going to be able to satisfy you then. I didn't
    introduce the names in the patch, so let's leave them as is for now,
    and everybody can muse on what they should get called in the end.

    > > > If (page->flags & (all the flags including dirty and SwapBacked))
    > > > zap-em.
    > >
    > > That's exactly what I did, isn't it?
    > Yes but you added another instance of this.

    Did I? Whereabouts? I wonder if you're thinking of the
    + page->flags &= ~PAGE_FLAGS_CHECK_AT_PREP;
    in prep_new_page(), which replaces the clearing of another
    collection of flags which somehow didn't get named before.

    That clearing is a temporary measure, to keep the handling
    of PageReserved unchanged in that patch; then it vanishes in the
    next patch, where we treat all bad_page candidates the same way.

    > Can you consolidate all the check and clears into one?

    You mean one test_and_clear_bits() that somehow covers the different
    cases of what we expect at free time and what we need at alloc time?
    I don't think so.


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