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authorMichal Hocko <mhocko@suse.com>2019-02-01 14:21:12 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2019-02-01 15:46:23 -0800
commite3df4c6e4836ce93cd5cf92d9cbdeaf4439a0241 (patch)
tree2f6cc7bb49b820e82c6aae5c2e70429caeeb4b8c
parent6376360ecbe525a9c17b3d081dfd88ba3e4ed65b (diff)
mm, memory_hotplug: __offline_pages fix wrong locking
Jan has noticed that we do double unlock on some failure paths when offlining a page range. This is indeed the case when test_pages_in_a_zone respp. start_isolate_page_range fail. This was an omission when forward porting the debugging patch from an older kernel. Fix the issue by dropping mem_hotplug_done from the failure condition and keeping the single unlock in the catch all failure path. Link: http://lkml.kernel.org/r/20190115120307.22768-1-mhocko@kernel.org Fixes: 7960509329c2 ("mm, memory_hotplug: print reason for the offlining failure") Signed-off-by: Michal Hocko <mhocko@suse.com> Reported-by: Jan Kara <jack@suse.cz> Reviewed-by: Jan Kara <jack@suse.cz> Tested-by: Jan Kara <jack@suse.cz> Reviewed-by: Oscar Salvador <osalvador@suse.de> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/memory_hotplug.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
index a0130633a6e1..124e794867c5 100644
--- a/mm/memory_hotplug.c
+++ b/mm/memory_hotplug.c
@@ -1570,7 +1570,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
we assume this for now. .*/
if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start,
&valid_end)) {
- mem_hotplug_done();
ret = -EINVAL;
reason = "multizone range";
goto failed_removal;
@@ -1585,7 +1584,6 @@ static int __ref __offline_pages(unsigned long start_pfn,
MIGRATE_MOVABLE,
SKIP_HWPOISON | REPORT_FAILURE);
if (ret) {
- mem_hotplug_done();
reason = "failure to isolate range";
goto failed_removal;
}