[PATCH] mm/oom_kill: fix stale comment in constrained_alloc()

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

From: Ye Liu <liuye@kylinos.cn>

The comment above the __GFP_THISNODE check in constrained_alloc()
is stale and inaccurate: it references __GFP_NOFAIL (which is not
checked here), claims the OOM killer does "random task kill" (it
uses badness scores), and mentions CONSTRAINT_THISNODE (which was
never added to the enum).  Replace it with a description that
matches the actual code behavior.

Signed-off-by: Ye Liu <liuye@kylinos.cn>
---
 mm/oom_kill.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 5f372f6e26fa..4b5c70aaece4 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -268,9 +268,9 @@ static enum oom_constraint constrained_alloc(struct oom_control *oc)
 	if (!oc->zonelist)
 		return CONSTRAINT_NONE;
 	/*
-	 * Reach here only when __GFP_NOFAIL is used. So, we should avoid
-	 * to kill current.We have to random task kill in this case.
-	 * Hopefully, CONSTRAINT_THISNODE...but no way to handle it, now.
+	 * __GFP_THISNODE means the allocation is restricted to a single node.
+	 * There is no dedicated constraint type for this case, so return
+	 * CONSTRAINT_NONE and let the normal OOM handling proceed.
 	 */
 	if (oc->gfp_mask & __GFP_THISNODE)
 		return CONSTRAINT_NONE;
-- 
2.25.1