task #29077503
commit e3df4c6e4836ce93cd5cf92d9cbdeaf4439a0241 upstream
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: NMichal Hocko <mhocko@suse.com>
Reported-by: NJan Kara <jack@suse.cz>
Reviewed-by: NJan Kara <jack@suse.cz>
Tested-by: NJan Kara <jack@suse.cz>
Reviewed-by: NOscar Salvador <osalvador@suse.de>
Reviewed-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
(cherry picked from ccommit e3df4c6e4836ce93cd5cf92d9cbdeaf4439a0241)
Signed-off-by: NAlex Shi <alex.shi@linux.alibaba.com>
Reviewed-by: NYang Shi <yang.shi@linux.alibaba.com>