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Subject[PATCH 01/12] percpu: update free path with correct new free region
When updating the chunk's contig_hint on the free path of a hint that
does not touch the page boundaries, it was incorrectly using the
starting offset of the free region and the block's contig_hint. This
could lead to incorrect assumptions about fit given a size and better
alignment of the start. Fix this by using (end - start) as this is only
called when updating a hint within a block.

Signed-off-by: Dennis Zhou <>
mm/percpu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/percpu.c b/mm/percpu.c
index db86282fd024..53bd79a617b1 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -871,7 +871,7 @@ static void pcpu_block_update_hint_free(struct pcpu_chunk *chunk, int bit_off,
pcpu_chunk_update(chunk, pcpu_block_off_to_off(s_index, start),
- s_block->contig_hint);
+ end - start);

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