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    SubjectRe: [PATCH] hugetlb: document the new location of page subpool pointer
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    On 24.02.21 05:04, Mike Kravetz wrote:
    > Expand comments, no functional change.
    >
    > Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
    > ---
    > include/linux/hugetlb.h | 3 +++
    > 1 file changed, 3 insertions(+)
    >
    > diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
    > index cccd1aab69dd..c0467a7a1fe0 100644
    > --- a/include/linux/hugetlb.h
    > +++ b/include/linux/hugetlb.h
    > @@ -476,6 +476,9 @@ unsigned long hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
    > * huegtlb page specific state flags. These flags are located in page.private
    > * of the hugetlb head page. Functions created via the below macros should be
    > * used to manipulate these flags.
    > + * Note: The hugetlb page subpool pointer previously located at page.private
    > + * was moved to page[1].private to make room for flags in the head page. See
    > + * hugetlb_page_subpool().
    > *
    > * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at
    > * allocation time. Cleared when page is fully instantiated. Free
    >

    Reviewed-by: David Hildenbrand <david@redhat.com>

    --
    Thanks,

    David / dhildenb

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