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From: Jason Gunthorpe <jgg@nvidia.com>
To: "Yang, Xiao/杨 晓" <yangx.jy@fujitsu.com>
Cc: "linux-rdma@vger.kernel.org" <linux-rdma@vger.kernel.org>,
	"leon@kernel.org" <leon@kernel.org>,
	"rpearsonhpe@gmail.com" <rpearsonhpe@gmail.com>,
	"zyjzyj2000@gmail.com" <zyjzyj2000@gmail.com>,
	"lizhijian@fujitsu.com" <lizhijian@fujitsu.com>
Subject: Re: [RESEND PATCH v5 1/2] RDMA/rxe: Support RDMA Atomic Write operation
Date: Mon, 24 Oct 2022 14:02:19 -0300	[thread overview]
Message-ID: <Y1bFG/OM5zSOoWcr@nvidia.com> (raw)
In-Reply-To: <ae0ec888-a509-5e79-2449-69a379d6dc16@fujitsu.com>

On Thu, Oct 20, 2022 at 09:25:46PM +0800, Yang, Xiao/杨 晓 wrote:
> On 2022/10/15 0:00, Jason Gunthorpe wrote:
> > People have been thinking of new uses for kmap, rxe still should be
> > calling it.
> 
> Hi Jason,
> 
> Thanks a lot for your reply.
> Could you tell me what is the new usage about kmap()?

New in-kernel memory protection schemes
 
> > The above just explains why it doesn't fail today, it doesn't excuse
> > the wrong usage.
> 
> I wonder why we need to use kmap() in this case?
> I'm sorry to ask the stupid question.

It is the defined API to convert a struct page into an address the CPU
can access.

Jason

  reply	other threads:[~2022-10-24 18:50 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-07-08  4:02 [RESEND PATCH v5 0/2] RDMA/rxe: Add RDMA Atomic Write operation yangx.jy
2022-07-08  4:02 ` [RESEND PATCH v5 1/2] RDMA/rxe: Support " yangx.jy
2022-09-23 22:22   ` Jason Gunthorpe
2022-09-26  6:55     ` Yang, Xiao/杨 晓
2022-10-06  7:53     ` Yang, Xiao/杨 晓
2022-10-14 16:00       ` Jason Gunthorpe
2022-10-20 13:25         ` Yang, Xiao/杨 晓
2022-10-24 17:02           ` Jason Gunthorpe [this message]
2022-09-27  8:18   ` Li Zhijian
2022-09-27 13:17     ` Jason Gunthorpe
2022-09-29  3:58       ` Yang, Xiao/杨 晓
2022-09-29  5:36         ` Yang, Xiao/杨 晓
2022-07-08  4:02 ` [RESEND PATCH v5 2/2] RDMA/rxe: Add RDMA Atomic Write attribute for rxe device yangx.jy
2022-08-04  7:30 ` [RESEND PATCH v5 0/2] RDMA/rxe: Add RDMA Atomic Write operation yangx.jy

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