[PATCH] mm/oom_kill, proc: replace magic number 1000 with OOM_SCORE_ADJ_MAX

[Ye Liu <ye.liu@linux.dev>]

From: Ye Liu <liuye@kylinos.cn>

In oom_badness() and proc_oom_score(), the oom_score_adj normalization
uses a hardcoded 1000, which is the value of OOM_SCORE_ADJ_MAX defined
in include/uapi/linux/oom.h.  Other code in the kernel (e.g.
fs/proc/base.c oom_adj handling) already uses OOM_SCORE_ADJ_MAX for
the same purpose.

Replace the magic number with the macro for consistency and
readability.  No functional change.

Signed-off-by: Ye Liu <liuye@kylinos.cn>
---
 fs/proc/base.c | 3 ++-
 mm/oom_kill.c  | 2 +-
 2 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 6a39de424f62..58be38942460 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -594,7 +594,8 @@ static int proc_oom_score(struct seq_file *m, struct pid_namespace *ns,
 	 * exporting for a long time so userspace might depend on it.
 	 */
 	if (badness != LONG_MIN)
-		points = (1000 + badness * 1000 / (long)totalpages) * 2 / 3;
+		points = (OOM_SCORE_ADJ_MAX +
+			  badness * OOM_SCORE_ADJ_MAX / (long)totalpages) * 2 / 3;
 
 	seq_printf(m, "%lu\n", points);
 
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 5f372f6e26fa..08bff7a55db8 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -230,7 +230,7 @@ long oom_badness(struct task_struct *p, unsigned long totalpages)
 	task_unlock(p);
 
 	/* Normalize to oom_score_adj units */
-	adj *= totalpages / 1000;
+	adj *= totalpages / OOM_SCORE_ADJ_MAX;
 	points += adj;
 
 	return points;
-- 
2.25.1