On 29 Jun 2020, at 11:19, Matthew Wilcox (Oracle) wrote: > Introduce the new page policy of PF_SECOND which lets us use the > normal pageflags generation machinery to create the various DoubleMap > manipulation functions. > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > --- > include/linux/page-flags.h | 40 ++++++++++---------------------------- > 1 file changed, 10 insertions(+), 30 deletions(-) > > diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h > index b4e6051aa311..7182103583d2 100644 > --- a/include/linux/page-flags.h > +++ b/include/linux/page-flags.h > @@ -232,6 +232,9 @@ static inline void page_init_poison(struct page *page, size_t size) > * > * PF_NO_COMPOUND: > * the page flag is not relevant for compound pages. > + * > + * PF_SECOND: > + * the page flag is stored in the first tail page. Just wonder if PF_FIRST_TAIL_PAGE is more informative, although it has more characters to type. :) — Best Regards, Yan Zi
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