linux-kernel - [PATCH 3.2 004/102] percpu: free percpu allocation info for uniprocessor system

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Date:	Sat, 01 Nov 2014 22:28:03 +0000
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org, "Honggang Li" <enjoymindful@...il.com>,
	"Tejun Heo" <tj@...nel.org>
Subject: [PATCH 3.2 004/102] percpu: free percpu allocation info for
 uniprocessor system

3.2.64-rc1 review patch.  If anyone has any objections, please let me know.

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

From: Honggang Li <enjoymindful@...il.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@...il.com>
Signed-off-by: Tejun Heo <tj@...nel.org>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 mm/percpu.c | 2 ++
 1 file changed, 2 insertions(+)

--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1895,6 +1895,8 @@ 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 */

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