linux-kernel - [PATCH 1/5] mm: compaction: Remove redundant VM_BUG_ON() in compact

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Message-Id: <740a2396d9b98154dba76e326cba5e798b640ead.1673342761.git.baolin.wang@linux.alibaba.com>
Date:   Tue, 10 Jan 2023 21:36:18 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     akpm@...ux-foundation.org
Cc:     baolin.wang@...ux.alibaba.com, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/5] mm: compaction: Remove redundant VM_BUG_ON() in compact_zone()

The compaction_suitable() will never return values other than COMPACT_SUCCESS,
COMPACT_SKIPPED and COMPACT_CONTINUE, so after validation of COMPACT_SUCCESS
and COMPACT_SKIPPED, we will never hit other unexpected case. Thus remove
the redundant VM_BUG_ON() validation for the return values of compaction_suitable().

Signed-off-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
---
 mm/compaction.c | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 62a61de44658..5e6f5e35748d 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -2313,9 +2313,6 @@ compact_zone(struct compact_control *cc, struct capture_control *capc)
 	if (ret == COMPACT_SUCCESS || ret == COMPACT_SKIPPED)
 		return ret;
 
-	/* huh, compaction_suitable is returning something unexpected */
-	VM_BUG_ON(ret != COMPACT_CONTINUE);
-
 	/*
 	 * Clear pageblock skip if there were failures recently and compaction
 	 * is about to be retried after being deferred.
-- 
2.27.0