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Date:   Tue, 22 Jun 2021 11:07:56 -0700
From:   Linus Torvalds <>
To:     Matthew Wilcox <>
Cc:     David Howells <>,
        Al Viro <>, "Ted Ts'o" <>,
        Dave Hansen <>,
        Andrew Morton <>,
        Linux-MM <>,
        Ext4 Developers List <>,
        linux-fsdevel <>,
        Linux Kernel Mailing List <>
Subject: Re: Do we need to unrevert "fs: do not prefault sys_write() user
 buffer pages"?

On Tue, Jun 22, 2021 at 11:05 AM Matthew Wilcox <> wrote:
> Huh?  Last I checked, the fault_in_readable actually read a byte from
> the page.  It has to wait for the read to complete before that can
> happen.

Yeah, we don't have any kind of async fault-in model.

I'm not sure how that would even look. I don't think it would
necessarily be *impossible* (special marker in the exception table to
let the fault code know that this is a "prepare" fault), but it would
be pretty challenging.


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