[PATCH v2 2/2] mm/damon: use damon_sz_region() in appropriate place

[Xin Hao <xhao@linux.alibaba.com>]

In many place, we can use damon_sz_region() to instead of "r->ar.end -
r->ar.start".

Suggested-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
---

Changes from v1
( https://lore.kernel.org/linux-mm/20220926071100.76379-1-xhao@linux.alibaba.com/)
- Move sz_damon_region() to static inline in include/linux/damon.h
- Rename sz_damon_region() to damon_sz_region()

 mm/damon/core.c  | 17 ++++++++---------
 mm/damon/vaddr.c |  4 ++--
 2 files changed, 10 insertions(+), 11 deletions(-)

diff --git a/mm/damon/core.c b/mm/damon/core.c
index 5b9e0d585aef..515ac4e52a11 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -490,7 +490,7 @@ static unsigned long damon_region_sz_limit(struct damon_ctx *ctx)

 	damon_for_each_target(t, ctx) {
 		damon_for_each_region(r, t)
-			sz += r->ar.end - r->ar.start;
+			sz += damon_sz_region(r);
 	}

 	if (ctx->attrs.min_nr_regions)
@@ -673,7 +673,7 @@ static bool __damos_valid_target(struct damon_region *r, struct damos *s)
 {
 	unsigned long sz;

-	sz = r->ar.end - r->ar.start;
+	sz = damon_sz_region(r);
 	return s->pattern.min_sz_region <= sz &&
 		sz <= s->pattern.max_sz_region &&
 		s->pattern.min_nr_accesses <= r->nr_accesses &&
@@ -701,7 +701,7 @@ static void damon_do_apply_schemes(struct damon_ctx *c,

 	damon_for_each_scheme(s, c) {
 		struct damos_quota *quota = &s->quota;
-		unsigned long sz = r->ar.end - r->ar.start;
+		unsigned long sz = damon_sz_region(r);
 		struct timespec64 begin, end;
 		unsigned long sz_applied = 0;

@@ -730,14 +730,14 @@ static void damon_do_apply_schemes(struct damon_ctx *c,
 				sz = ALIGN_DOWN(quota->charge_addr_from -
 						r->ar.start, DAMON_MIN_REGION);
 				if (!sz) {
-					if (r->ar.end - r->ar.start <=
-							DAMON_MIN_REGION)
+					if (damon_sz_region(r) <=
+					    DAMON_MIN_REGION)
 						continue;
 					sz = DAMON_MIN_REGION;
 				}
 				damon_split_region_at(t, r, sz);
 				r = damon_next_region(r);
-				sz = r->ar.end - r->ar.start;
+				sz = damon_sz_region(r);
 			}
 			quota->charge_target_from = NULL;
 			quota->charge_addr_from = 0;
@@ -842,8 +842,7 @@ static void kdamond_apply_schemes(struct damon_ctx *c)
 					continue;
 				score = c->ops.get_scheme_score(
 						c, t, r, s);
-				quota->histogram[score] +=
-					r->ar.end - r->ar.start;
+				quota->histogram[score] += damon_sz_region(r);
 				if (score > max_score)
 					max_score = score;
 			}
@@ -957,7 +956,7 @@ static void damon_split_regions_of(struct damon_target *t, int nr_subs)
 	int i;

 	damon_for_each_region_safe(r, next, t) {
-		sz_region = r->ar.end - r->ar.start;
+		sz_region = damon_sz_region(r);

 		for (i = 0; i < nr_subs - 1 &&
 				sz_region > 2 * DAMON_MIN_REGION; i++) {
diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index ea94e0b2c311..15f03df66db6 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -72,7 +72,7 @@ static int damon_va_evenly_split_region(struct damon_target *t,
 		return -EINVAL;

 	orig_end = r->ar.end;
-	sz_orig = r->ar.end - r->ar.start;
+	sz_orig = damon_sz_region(r);
 	sz_piece = ALIGN_DOWN(sz_orig / nr_pieces, DAMON_MIN_REGION);

 	if (!sz_piece)
@@ -618,7 +618,7 @@ static unsigned long damos_madvise(struct damon_target *target,
 {
 	struct mm_struct *mm;
 	unsigned long start = PAGE_ALIGN(r->ar.start);
-	unsigned long len = PAGE_ALIGN(r->ar.end - r->ar.start);
+	unsigned long len = PAGE_ALIGN(damon_sz_region(r));
 	unsigned long applied;

 	mm = damon_get_mm(target);
--
2.31.0