linux-kernel - Re: [PATCH v2 13/18] uaccess: generalize access

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Message-ID: <CAK8P3a17kdz0gKYz3cDSpvWa80TY6QNSom11HVAb8h91RZn0Jg@mail.gmail.com>
Date:   Fri, 18 Feb 2022 08:23:29 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Christoph Hellwig <hch@....de>
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        linux-arch <linux-arch@...r.kernel.org>,
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Subject: Re: [PATCH v2 13/18] uaccess: generalize access_ok()

On Fri, Feb 18, 2022 at 7:34 AM Christoph Hellwig <hch@....de> wrote:
>
> > +#include <asm-generic/access_ok.h>
>
> Instead of the asm-generic games, shouldn't we just define access_ok in
> <linux/uaccess.h> if not already defined by the architecture?

I tried, but couldn't actually make it work because asm/uaccess.h tends
to contain inline functions that rely on access_ok(). It could work once we
move all the high-level functions into linux/uaccess.h, but that would likely
require another long patch series.

One option that can work is to require architectures to have an
asm/access_ok.h header that gets included by linux/uaccess.h.
On most architectures, that would be redirected to
asm-generic/access_ok.h, as only ia64, x86, arm64 and um
need to override the definition.

      Arnd