netdev - Re: how to determine if buffers are in user-space/kernel-space

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Message-ID: <20210118182044.26d59491@hermes.local>
Date:   Mon, 18 Jan 2021 18:20:44 -0800
From:   Stephen Hemminger <stephen@...workplumber.org>
To:     Raju Rangoju <rajur@...lsio.com>
Cc:     netdev@...r.kernel.org, hch@....de, rahul.lakkireddy@...lsio.com
Subject: Re: how to determine if buffers are in user-space/kernel-space

On Mon, 18 Jan 2021 23:56:37 +0530
Raju Rangoju <rajur@...lsio.com> wrote:

> Hi,
> 
> We have an out-of-tree kernel module which was using
> segment_eq(get_fs(), KERNEL_DS) to determine whether buffers are in
> Kernel space vs User space. However, with the get_fs() and its friends
> removed[1], we are out of ideas on how to determine if buffers are in
> user space or kernel space. Can someone shed some light on how to
> accomplish it?
> 

Sorry, you are asking in the wrong place. Supporting any out of
tree modules is completely your own problem to deal with.