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 2ddf9a990dbd057228782a3af5ac6901a0af632b..492f601df47300fb8d98be001ddb26f4521dddb7 100644 (file)
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1933,6 +1933,8 @@ 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 */