Re: [PATCH] mm: remove offset check on page->compound_head and folio->lru

Matthew Wilcox
2022-01-07T22:11:44Z

On Fri, Jan 07, 2022 at 01:40:59PM +0000, Wei Yang wrote:
> On Fri, Jan 07, 2022 at 03:59:01AM +0000, Matthew Wilcox wrote:
> >On Thu, Jan 06, 2022 at 11:52:54PM +0000, Wei Yang wrote:
> >> FOLIO_MATCH() is used to make sure struct page and folio has identical
> >> layout for the first several words.
> >>
> >> The comparison of offset between page->compound_head and folio->lru is
> >> more like an internal check in struct page.
> >>
> >> This patch just removes it.
> >>
> >> Signed-off-by: Wei Yang <richard.weiyang@gmail.com>
> >
> >No.
>
> Hi, Matthew
>
> Would you mind sharing some insight on this check?

It's right there in the comments. If you can't be bothered to read,
why should I write?