[merged mm-stable] mm-compaction-remove-redundant-vm_bug_on-in-compact_zone.patch removed from -mm tree

[merged mm-stable] mm-compaction-remove-redundant-vm_bug_on-in-compact_zone.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: compaction: remove redundant VM_BUG_ON() in compact_zone()
has been removed from the -mm tree.  Its filename was
     mm-compaction-remove-redundant-vm_bug_on-in-compact_zone.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Baolin Wang <baolin.wang@linux.alibaba.com>
Subject: mm: compaction: remove redundant VM_BUG_ON() in compact_zone()
Date: Tue, 10 Jan 2023 21:36:18 +0800

Patch series "Some small improvements for compaction".

When I did some compaction testing, I found some small room for
improvement as well as some code cleanups.


This patch (of 5):

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().

Link: https://lkml.kernel.org/r/cover.1673342761.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/740a2396d9b98154dba76e326cba5e798b640ead.1673342761.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/compaction.c~mm-compaction-remove-redundant-vm_bug_on-in-compact_zone
+++ a/mm/compaction.c
@@ -2313,9 +2313,6 @@ compact_zone(struct compact_control *cc,
 	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.
_

Patches currently in -mm which might be from baolin.wang@linux.alibaba.com are