In pcpu_setup_first_chunk() pcpu_reserved_chunk is assigned to point to
static chunk. While pcpu_first_chunk is got from below code:
pcpu_first_chunk = dchunk ?: schunk;
Then it could point to static chunk too if dynamic chunk doesn't exist. So
in this patch adding a check in percpu_init_late() to see if pcpu_first_chunk
is equal to pcpu_reserved_chunk. Only if they are not equal we add
pcpu_reserved_chunk to the target array.
Signed-off-by: Baoquan He <bhe@xxxxxxxxxx>
---
mm/percpu.c | 9 ++++++++-
1 file changed, 8 insertions(+), 1 deletion(-)
diff --git a/mm/percpu.c b/mm/percpu.c
index a63b4d8..f7e02c0 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -2260,11 +2260,18 @@ void __init setup_per_cpu_areas(void)
void __init percpu_init_late(void)
{
struct pcpu_chunk *target_chunks[] =
- { pcpu_first_chunk, pcpu_reserved_chunk, NULL };
+ { pcpu_first_chunk, NULL, NULL };
struct pcpu_chunk *chunk;
unsigned long flags;
int i;
+ /*
+ * pcpu_first_chunk could be the same as pcpu_reserved_chunk, add it to the
+ * target array only if pcpu_first_chunk is not equal to pcpu_reserved_chunk.
+ */
+ if (pcpu_first_chunk != pcpu_reserved_chunk)
+ target_chunks[1] = pcpu_reserved_chunk;
+
for (i = 0; (chunk = target_chunks[i]); i++) {
int *map;
const size_t size = PERCPU_DYNAMIC_EARLY_SLOTS * sizeof(map[0]);
--
1.9.3
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