From: Jason Gunthorpe <jgg@ziepe.ca>
To: Yanjun Zhu <yanjun.zhu@linux.dev>
Cc: Zhu Yanjun <yanjun.zhu@intel.com>,
zyjzyj2000@gmail.com, leon@kernel.org,
linux-rdma@vger.kernel.org
Subject: Re: [for-next PATCH 1/1] RDMA/rxe: sgt_append from ib_umem_get is not highmem
Date: Tue, 22 Nov 2022 10:06:00 -0400 [thread overview]
Message-ID: <Y3zXSK1Wb1/T7vx1@ziepe.ca> (raw)
In-Reply-To: <6cb433cb-c463-7cd8-ee5e-7e922733744a@linux.dev>
On Tue, Nov 22, 2022 at 12:07:06PM +0800, Yanjun Zhu wrote:
> But can user space access these high memory? From "Understanding the Linux
> Kernel", third edition, it seems that it is in kernel space.
Yes, "highmem" is effecitvely the ability to have a struct page * that
is not mapped into the kernel address space, but is mapped into a
userspace process address sspace.
Jason
next prev parent reply other threads:[~2022-11-22 14:07 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-30 3:04 [PATCH for-next v2] RDMA/rxe: Fix mr->map double free Li Zhijian
2022-11-12 3:29 ` lizhijian
2022-11-13 12:40 ` Yanjun Zhu
2022-11-16 0:10 ` Yanjun Zhu
2022-11-16 2:39 ` lizhijian
2022-11-19 0:15 ` Jason Gunthorpe
2022-11-19 8:25 ` Yanjun Zhu
2022-11-20 1:29 ` [for-next PATCH 1/1] RDMA/rxe: sgt_append from ib_umem_get is not highmem Zhu Yanjun
2022-11-19 10:30 ` lizhijian
2022-11-19 13:20 ` Yanjun Zhu
2022-11-21 15:28 ` Jason Gunthorpe
2022-11-22 4:07 ` Yanjun Zhu
2022-11-22 14:06 ` Jason Gunthorpe [this message]
2022-11-23 1:53 ` Yanjun Zhu
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