linux-kernel - [PATCH v2] mm/damon/vaddr: add a comment for 'default' case in damon_va_apply

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Message-Id: <1662606797-23534-1-git-send-email-kaixuxia@tencent.com>
Date:   Thu,  8 Sep 2022 11:13:17 +0800
From:   xiakaixu1987@...il.com
To:     sj@...nel.org, akpm@...ux-foundation.org
Cc:     damon@...ts.linux.dev, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Kaixu Xia <kaixuxia@...cent.com>
Subject: [PATCH v2] mm/damon/vaddr: add a comment for 'default' case in damon_va_apply_scheme()

From: Kaixu Xia <kaixuxia@...cent.com>

The switch case 'DAMOS_STAT' and switch case 'default' have same
return value in damon_va_apply_scheme(), and the 'default' case
is for DAMOS actions that not supported by 'vaddr'. It might
make sense to add a comment here.

Signed-off-by: Kaixu Xia <kaixuxia@...cent.com>
---
 mm/damon/vaddr.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c
index 3c7b9d6dca95..3814200e61e4 100644
--- a/mm/damon/vaddr.c
+++ b/mm/damon/vaddr.c
@@ -646,6 +646,9 @@ static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx,
 	case DAMOS_STAT:
 		return 0;
 	default:
+		/*
+		 * DAMOS actions that not yet supported by 'vaddr'.
+		 */
 		return 0;
 	}
 
-- 
2.27.0