commit c33fb8a5029e86a633b3946d0be4497549f2692d
author Honggang Li <enjoymindful@gmail.com> Tue Aug 12 21:36:15 2014 +0800
committer chrmhoffmann <chrmhoffmann@gmail.com> Sun Apr 05 10:20:41 2020 +0200
tree 9e404f2a3871f20c93e123d4440ac7af1082946f
parent 304649168584401cd9aa5499533d371d9d19ab8f

percpu: free percpu allocation info for uniprocessor system

commit 3189eddbcafcc4d827f7f19facbeddec4424eba8 upstream.

Currently, only SMP system free the percpu allocation info.
Uniprocessor system should free it too. For example, one x86 UML
virtual machine with 256MB memory, UML kernel wastes one page memory.

Signed-off-by: Honggang Li <enjoymindful@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Signed-off-by: Zefan Li <lizefan@huawei.com>

mm/percpu.c

diff --git a/mm/percpu.c b/mm/percpu.c
index 13b2eef..5f6042b 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1907,6 +1907,8 @@
 
 	if (pcpu_setup_first_chunk(ai, fc) < 0)
 		panic("Failed to initialize percpu areas.");
+
+	pcpu_free_alloc_info(ai);
 }
 
 #endif	/* CONFIG_SMP */