Re: [PATCH] mm: don't be stuck to rmap lock on reclaim path

[Minchan Kim]

On Wed, May 04, 2022 at 04:32:13AM +0100, Matthew Wilcox wrote:
> On Tue, May 03, 2022 at 10:03:41AM -0700, Minchan Kim wrote:
> > -void rmap_walk(struct folio *folio, const struct rmap_walk_control *rwc);
> > -void rmap_walk_locked(struct folio *folio, const struct rmap_walk_control *rwc);
> > +void rmap_walk(struct folio *folio, struct rmap_walk_control *rwc);
> > +void rmap_walk_locked(struct folio *folio, struct rmap_walk_control *rwc);
> 
> I see the build bot already beat me to pointing out why this is wrong,
> but do you not look at git log to figure out why code was changed to be
> the way it is now, before you change it back?

This patch added a new field as out param like compact_control so
the rmap_walk_control is not immutable.