[PATCH AUTOSEL for 4.9 087/100] percpu: don't forget to free the temporary struct pcpu_alloc_info

[alexander . levin]

From: Nicolas Pitre <nicolas.pitre@xxxxxxxxxx>

[ Upstream commit 438a50618095061920d3a30d4c5ca1ef2e0ff860 ]

Unlike the SMP case, the !SMP case does not free the memory for struct
pcpu_alloc_info allocated in setup_per_cpu_areas(). And to give it a
chance of being reused by the page allocator later, align it to a page
boundary just like its size.

Signed-off-by: Nicolas Pitre <nico@xxxxxxxxxx>
Acked-by: Dennis Zhou <dennisszhou@xxxxxxxxx>
Signed-off-by: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
---
 mm/percpu.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index f014cebbf405..8cc924e0fd5c 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1400,7 +1400,7 @@ struct pcpu_alloc_info * __init pcpu_alloc_alloc_info(int nr_groups,
 			  __alignof__(ai->groups[0].cpu_map[0]));
 	ai_size = base_size + nr_units * sizeof(ai->groups[0].cpu_map[0]);
 
-	ptr = memblock_virt_alloc_nopanic(PFN_ALIGN(ai_size), 0);
+	ptr = memblock_virt_alloc_nopanic(PFN_ALIGN(ai_size), PAGE_SIZE);
 	if (!ptr)
 		return NULL;
 	ai = ptr;
@@ -2264,6 +2264,7 @@ 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 */
-- 
2.11.0