linux-kernel - Re: [PATCH 11/14] sparc64: remove CONFIG_SET

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Message-ID: <Ygr4Q2/KxfF86ETa@zeniv-ca.linux.org.uk>
Date:   Tue, 15 Feb 2022 00:48:03 +0000
From:   Al Viro <viro@...iv.linux.org.uk>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Christoph Hellwig <hch@....de>, linux-arch@...r.kernel.org,
        linux-mm@...ck.org, linux-api@...r.kernel.org, arnd@...db.de,
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Subject: Re: [PATCH 11/14] sparc64: remove CONFIG_SET_FS support

On Mon, Feb 14, 2022 at 05:34:49PM +0100, Arnd Bergmann wrote:

> -/*
> - * Sparc64 is segmented, though more like the M68K than the I386.
> - * We use the secondary ASI to address user memory, which references a
> - * completely different VM map, thus there is zero chance of the user
> - * doing something queer and tricking us into poking kernel memory.

Actually, this part of comment probably ought to stay - it is relevant
for understanding what's going on (e.g. why is access_ok() always true, etc.)