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SubjectRe: [PATCH -next 2/3] md/raid10: convert resync_lock to use seqlock
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Hi,

On 8/29/22 9:15 PM, Yu Kuai wrote:
> +static bool wait_barrier_nolock(struct r10conf *conf)
> +{
> + unsigned int seq = raw_read_seqcount(&conf->resync_lock.seqcount);
> +
> + if (seq & 1)
> + return false;
> +
> + if (READ_ONCE(conf->barrier))
> + return false;
> +
> + atomic_inc(&conf->nr_pending);
> + if (!read_seqcount_retry(&conf->resync_lock.seqcount, seq))

I think 'seq' is usually get from read_seqcount_begin.

> + return true;
> +
> + atomic_dec(&conf->nr_pending);
> + return false;
> +

Thanks,
Guoqing

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