On 10 Jun 2020, at 16:12, Matthew Wilcox wrote: > From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> > > 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 de6e0696f55c..979460df4768 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. > */ Would PF_FIRST_TAIL or PF_SECOND_IN_COMPOUND be more informative? — Best Regards, Yan Zi
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