linux-kernel - Re: [PATCH] iov_iter: separate direction from flavour

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Message-ID: <CAHk-=whD38FwDPc=gemuS6wNMDxO-PyVbtvcta3qXyO1ROc4EQ@mail.gmail.com>
Date:   Sun, 4 Jul 2021 15:44:17 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Christoph Hellwig <hch@....de>, Al Viro <viro@...iv.linux.org.uk>,
        linux-fsdevel <linux-fsdevel@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        David Sterba <dsterba@...e.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Anton Altaparmakov <anton@...era.com>,
        David Howells <dhowells@...hat.com>,
        Matthew Wilcox <willy@...radead.org>,
        Pavel Begunkov <asml.silence@...il.com>
Subject: Re: [PATCH] iov_iter: separate direction from flavour

On Sun, Jul 4, 2021 at 2:47 PM Guenter Roeck <linux@...ck-us.net> wrote:
>
> How about the following ?
>
>         WARN_ON_ONCE(IS_ENABLED(CONFIG_MMU) && uaccess_kernel());

Nope, that doesn't work either, because there are no-MMU setups that
don't make the same mistake no-mmu arm and m68k do.

Example: xtensa. But afaik also generic-asm/uaccess.h unless the
architecture overrides something.

So this literally seems like just an arm/m68k bug.

         Linus