linux-kernel - Re: [PATCH 1/2] io_uring: Pass whole sqe to commands

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Date:   Fri, 21 Apr 2023 08:11:31 -0700
From:   Breno Leitao <leitao@...ian.org>
To:     Christoph Hellwig <hch@....de>
Cc:     io-uring@...r.kernel.org, linux-nvme@...ts.infradead.org,
        asml.silence@...il.com, axboe@...nel.dk, leit@...com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        sagi@...mberg.me, kbusch@...nel.org, ming.lei@...hat.com
Subject: Re: [PATCH 1/2] io_uring: Pass whole sqe to commands

On Thu, Apr 20, 2023 at 06:57:12AM +0200, Christoph Hellwig wrote:
> On Wed, Apr 19, 2023 at 03:29:29AM -0700, Breno Leitao wrote:
> >  	struct nvme_uring_cmd_pdu *pdu = nvme_uring_cmd_pdu(ioucmd);
> > -	const struct nvme_uring_cmd *cmd = ioucmd->cmd;
> > +	const struct nvme_uring_cmd *cmd = (struct nvme_uring_cmd *)ioucmd->sqe->cmd;
> 
> Please don't add the pointless cast.  And in general avoid the overly
> long lines.

If I don't add this cast, the compiler complains with the follow error:

	drivers/nvme/host/ioctl.c: In function ‘nvme_uring_cmd_io’:
	drivers/nvme/host/ioctl.c:555:37: error: initialization of ‘const struct nvme_uring_cmd *’ from incompatible pointer type ‘const __u8 *’ {aka ‘const unsigned char *’} [-Werror=incompatible-pointer-types]
	  const struct nvme_uring_cmd *cmd = ioucmd->sqe->cmd;