linux-kernel - Re: [PATCH V4 1/5] nvme: do atomically bit operations on nvme

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Date:   Thu, 8 Mar 2018 08:57:36 +0100
From:   Christoph Hellwig <hch@....de>
To:     Jianchao Wang <jianchao.w.wang@...cle.com>
Cc:     keith.busch@...el.com, axboe@...com, hch@....de, sagi@...mberg.me,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V4 1/5] nvme: do atomically bit operations on
        nvme_request.flags

On Thu, Mar 08, 2018 at 02:19:27PM +0800, Jianchao Wang wrote:
> Do atomically bit operations on nvme_request.flags instead of
> regular read/write, then we could add other flags and set/clear
> them safely.
> 
> Signed-off-by: Jianchao Wang <jianchao.w.wang@...cle.com>

Looks good, assuming an actual need for this shows up in the next
patches :)

Reviewed-by: Christoph Hellwig <hch@....de>

> diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
> index e80fd74..02097e8 100644
> --- a/drivers/nvme/host/nvme.h
> +++ b/drivers/nvme/host/nvme.h
> @@ -93,8 +93,8 @@ struct nvme_request {
>  	struct nvme_command	*cmd;
>  	union nvme_result	result;
>  	u8			retries;
> -	u8			flags;
>  	u16			status;
> +	unsigned long flags;

Please align the field name like the others, though.