[PATCH 2/7] mm/damon/paddr: implement damon_folio_mkold()

[SeongJae Park]

damon_pa_mkold() receives physical address, get the folio covering the
address, and makes the folio as old.  A following commit will reuse the
internal logic for marking a given folio as old.  To avoid duplication
of the code, split the internal logic.  Also, change the rmap walker
function's name from __damon_pa_mkold() to damon_folio_mkold_one(),
following the change of the caller's name and the naming rule that more
commonly used by other rmap walkers.

Signed-off-by: SeongJae Park <sj@xxxxxxxxxx>
Tested-by: Honggyu Kim <honggyu.kim@xxxxxx>
---
 mm/damon/paddr.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c
index 25c3ba2a9eaf4..310b803c62779 100644
--- a/mm/damon/paddr.c
+++ b/mm/damon/paddr.c
@@ -16,8 +16,8 @@
 #include "../internal.h"
 #include "ops-common.h"
 
-static bool __damon_pa_mkold(struct folio *folio, struct vm_area_struct *vma,
-		unsigned long addr, void *arg)
+static bool damon_folio_mkold_one(struct folio *folio,
+		struct vm_area_struct *vma, unsigned long addr, void *arg)
 {
 	DEFINE_FOLIO_VMA_WALK(pvmw, folio, vma, addr, 0);
 
@@ -31,33 +31,38 @@ static bool __damon_pa_mkold(struct folio *folio, struct vm_area_struct *vma,
 	return true;
 }
 
-static void damon_pa_mkold(unsigned long paddr)
+static void damon_folio_mkold(struct folio *folio)
 {
-	struct folio *folio = damon_get_folio(PHYS_PFN(paddr));
 	struct rmap_walk_control rwc = {
-		.rmap_one = __damon_pa_mkold,
+		.rmap_one = damon_folio_mkold_one,
 		.anon_lock = folio_lock_anon_vma_read,
 	};
 	bool need_lock;
 
-	if (!folio)
-		return;
-
 	if (!folio_mapped(folio) || !folio_raw_mapping(folio)) {
 		folio_set_idle(folio);
-		goto out;
+		return;
 	}
 
 	need_lock = !folio_test_anon(folio) || folio_test_ksm(folio);
 	if (need_lock && !folio_trylock(folio))
-		goto out;
+		return;
 
 	rmap_walk(folio, &rwc);
 
 	if (need_lock)
 		folio_unlock(folio);
 
-out:
+}
+
+static void damon_pa_mkold(unsigned long paddr)
+{
+	struct folio *folio = damon_get_folio(PHYS_PFN(paddr));
+
+	if (!folio)
+		return;
+
+	damon_folio_mkold(folio);
 	folio_put(folio);
 }
 
-- 
2.39.2