[PATCH 3.13 004/163] percpu: free percpu allocation info for uniprocessor system

Kamal Mostafa kamal at canonical.com
Thu Oct 9 21:00:29 UTC 2014


3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Honggang Li <enjoymindful at gmail.com>

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 at gmail.com>
Signed-off-by: Tejun Heo <tj at kernel.org>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 mm/percpu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/mm/percpu.c b/mm/percpu.c
index 7d6ce15..02a89cb 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1911,6 +1911,8 @@ 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 */
-- 
1.9.1





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