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SubjectRE: [PATCH 01/12] percpu: update free path with correct new free region
Date


> -----Original Message-----
> From: owner-linux-mm@kvack.org [mailto:owner-linux-mm@kvack.org] On
> Behalf Of Dennis Zhou
> Sent: 2019年2月28日 10:18
> To: Dennis Zhou <dennis@kernel.org>; Tejun Heo <tj@kernel.org>; Christoph
> Lameter <cl@linux.com>
> Cc: Vlad Buslov <vladbu@mellanox.com>; kernel-team@fb.com;
> linux-mm@kvack.org; linux-kernel@vger.kernel.org
> 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 <dennis@kernel.org>
> ---
> 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_refresh_hint(chunk);
> else
> pcpu_chunk_update(chunk, pcpu_block_off_to_off(s_index, start),
> - s_block->contig_hint);
> + end - start);
> }

Reviewed-by: Peng Fan <peng.fan@nxp.com>

>
> /**
> --
> 2.17.1

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