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Date:   Sat, 13 May 2017 18:12:50 +0100
From:   Al Viro <>
To:     Linus Torvalds <>
Cc:     Linux Kernel Mailing List <>,
        "" <>
Subject: Re: [git pull] uaccess-related bits of vfs.git

On Sat, May 13, 2017 at 06:00:56PM +0100, Al Viro wrote:

> > But I don't see the excuse for not just doing it. If nobody notices,
> > it's an obvious improvement. And if somebody *does* notice, we know
> > how to do it properly with unsafe_xyz_user(), because "__xyz_user()"
> > most definitely isn't it.
> I think we ought to actually look through those places - there are few
> enough of them (outside of arch/, that is) and stac/clac overhead is
> not the only problem they tend to have.

PS: just to make it clear - I do _not_ propose to keep that shit around
indefinitely; I want __get_user()/__put_user() gone by the end of that

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