linux-kernel - Re: [PATCH] microblaze: remove CONFIG_SET

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Message-ID: <CAK8P3a3WC3dWdXNQPaU4J0EyhUZ6hmvCzO14HdUAQyq5j3s4ww@mail.gmail.com>
Date:   Mon, 14 Feb 2022 17:20:10 +0100
From:   Arnd Bergmann <arnd@...nel.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     Stafford Horne <shorne@...il.com>,
        Michal Simek <michal.simek@...inx.com>,
        Linux-Arch <linux-arch@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        "Eric W . Biederman" <ebiederm@...ssion.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Mark Rutland <mark.rutland@....com>,
        Nick Hu <nickhu@...estech.com>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>
Subject: Re: [PATCH] microblaze: remove CONFIG_SET_FS

On Mon, Feb 14, 2022 at 8:50 AM Christoph Hellwig <hch@...radead.org> wrote:
>
> I like the series a lot.
>
> Superficial comments:
>
> for nds32 is there any good reason why __get_user / __set_user check
> the address limit directly?  Maybe we should unify this and make it work
> like the other architectures.

I've done that now, and am glad I did, because I uncovered that
put_user() was actually missing the check that got added to __get_user()
by accident.

> With "uaccess: add generic __{get,put}_kernel_nofault" we should be able
> to remove HAVE_GET_KERNEL_NOFAULT entirely and just check if the helpers
> are already defined in linux/uaccess.h.

Good idea, changed now as well.

> The new generic __access_ok, and the 3 fixed up version early on
> have a whole lot of superflous braces.

I'd prefer to leave those in, the logic is complex enough that I'd
rather make sure this is completely obvious to readers.

I got a few built bot reports about missing __user annotations that were
uncovered by the added type checking in access_ok, fixed those
as well.

I'm doing another test build after the last changes, will send it out in a bit
if there are no further regressions.

        Arnd