linux-kernel - Re: [PATCH 01/16] uaccess: add untagged

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Date:   Tue, 4 Jun 2019 09:27:06 +0200
From:   Christoph Hellwig <hch@....de>
To:     Khalid Aziz <khalid.aziz@...cle.com>
Cc:     Christoph Hellwig <hch@....de>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Paul Burton <paul.burton@...s.com>,
        James Hogan <jhogan@...nel.org>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>,
        "David S. Miller" <davem@...emloft.net>,
        Andrey Konovalov <andreyknvl@...gle.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-mips@...r.kernel.org, linux-sh@...r.kernel.org,
        sparclinux@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-mm@...ck.org, x86@...nel.org, linux-kernel@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 01/16] uaccess: add untagged_addr definition for other
 arches

On Mon, Jun 03, 2019 at 09:16:08AM -0600, Khalid Aziz wrote:
> Could you reword above sentence? We are already starting off with
> untagged_addr() not being no-op for arm64 and sparc64. It will expand
> further potentially. So something more along the lines of "Define it as
> noop for architectures that do not support memory tagging". The first
> paragraph in the log can also be rewritten to be not specific to arm64.

Well, as of this patch this actually is a no-op for everyone.

Linus, what do you think of applying this patch (maybe with a slightly
fixed up commit log) to 5.2-rc so that we remove a cross dependency
between the series?