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    SubjectRe: [PATCH] mm: get_nid_for_pfn() returns int
    > On Mon, Jan 26, 2009 at 10:33:50PM -0800, Andrew Morton wrote:
    > > On Mon, 19 Jan 2009 09:59:19 -0800 Gary Hade <garyhade@us.ibm.com> wrote:
    > >
    > > > On Sun, Jan 18, 2009 at 11:36:28PM +0100, Roel Kluin wrote:
    > > > > get_nid_for_pfn() returns int
    > > > >
    > > > > Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
    > > > > ---
    > > > > vi drivers/base/node.c +256
    > > > > static int get_nid_for_pfn(unsigned long pfn)
    > > > >
    > > > > diff --git a/drivers/base/node.c b/drivers/base/node.c
    > > > > index 43fa90b..f8f578a 100644
    > > > > --- a/drivers/base/node.c
    > > > > +++ b/drivers/base/node.c
    > > > > @@ -303,7 +303,7 @@ int unregister_mem_sect_under_nodes(struct memory_block *mem_blk)
    > > > > sect_start_pfn = section_nr_to_pfn(mem_blk->phys_index);
    > > > > sect_end_pfn = sect_start_pfn + PAGES_PER_SECTION - 1;
    > > > > for (pfn = sect_start_pfn; pfn <= sect_end_pfn; pfn++) {
    > > > > - unsigned int nid;
    > > > > + int nid;
    > > > >
    > > > > nid = get_nid_for_pfn(pfn);
    > > > > if (nid < 0)
    > > >
    > > > My mistake. Good catch.
    > > >
    > >
    > > Presumably the (nid < 0) case has never happened.
    >
    > We do know that it is happening on one system while creating
    > a symlink for a memory section so it should also happen on
    > the same system if unregister_mem_sect_under_nodes() were
    > called to remove the same symlink.
    >
    > The test was actually added in response to a problem with an
    > earlier version reported by Yasunori Goto where one or more
    > of the leading pages of a memory section on the 2nd node of
    > one of his systems was uninitialized because I believe they
    > coincided with a memory hole.

    Yes. There are some memory hole pages which are occupied by firmware in
    our box.

    --
    Yasunori Goto




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