Re: [PATCH] md/raid5-ppl: Use atomic64_inc_return() in ppl_new_iounit()

[Yu Kuai <yukuai3@huawei.com>]

在 2024/10/07 16:48, Uros Bizjak 写道:
> Use atomic64_inc_return(&ref) instead of atomic64_add_return(1, &ref)
> to use optimized implementation and ease register pressure around
> the primitive for targets that implement optimized variant.
> 
> Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
> Cc: Song Liu <song@kernel.org>
> Cc: Yu Kuai <yukuai3@huawei.com>

LGTM
Reviewed-by: Yu Kuai <yukuai3@huawei.com>
> ---
>   drivers/md/raid5-ppl.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/md/raid5-ppl.c b/drivers/md/raid5-ppl.c
> index a70cbec12ed0..37c4da5311ca 100644
> --- a/drivers/md/raid5-ppl.c
> +++ b/drivers/md/raid5-ppl.c
> @@ -258,7 +258,7 @@ static struct ppl_io_unit *ppl_new_iounit(struct ppl_log *log,
>   	memset(pplhdr->reserved, 0xff, PPL_HDR_RESERVED);
>   	pplhdr->signature = cpu_to_le32(ppl_conf->signature);
>   
> -	io->seq = atomic64_add_return(1, &ppl_conf->seq);
> +	io->seq = atomic64_inc_return(&ppl_conf->seq);
>   	pplhdr->generation = cpu_to_le64(io->seq);
>   
>   	return io;
>