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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/percpu.c b/mm/percpu.c
index 25e2ea52db82c4cd93f4867636075991ca33d1e4..9bc1bf914cc8e2d476557d57a343e0fb28d3bc7f 100644 (file)
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1910,6 +1910,8 @@ void __init setup_per_cpu_areas(void)
 
        if (pcpu_setup_first_chunk(ai, fc) < 0)
                panic("Failed to initialize percpu areas.");
+
+       pcpu_free_alloc_info(ai);
 }
 
 #endif /* CONFIG_SMP */