Re: [PATCH v11 11/33] mm/lru: Add folio LRU functions

[David Howells]

Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> wrote:

> Handle arbitrary-order folios being added to the LRU.  By definition,
> all pages being added to the LRU were already head or base pages,
> so define page wrappers around folio functions where the original
> page functions involved calling compound_head() to manipulate flags,
> but define folio wrappers around page functions where there's no need to
> call compound_head().  The one thing that does change for those functions
> is calling compound_nr() instead of thp_nr_pages(), in order to handle
> arbitrary-sized folios.
> 
> Saves 783 bytes of kernel text; no functions grow.
> 
> Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
> Reviewed-by: Yu Zhao <yuzhao@xxxxxxxxxx>

Reviewed-by: David Howells <dhowells@xxxxxxxxxx>