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Date:   Wed, 13 Nov 2019 08:27:08 +0100
From:   Christoph Hellwig <hch@lst.de>
To:     Luis Chamberlain <mcgrof@kernel.org>
Cc:     Daniel Vetter <daniel.vetter@ffwll.ch>,
        Juergen Gross <jgross@suse.com>,
        Christoph Hellwig <hch@lst.de>,
        Tuowen Zhao <ztuowen@gmail.com>,
        AceLan Kao <acelan.kao@canonical.com>,
        Mika Westerberg <mika.westerberg@linux.intel.com>,
        Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
        Roman Gilg <subdiff@gmail.com>,
        Lee Jones <lee.jones@linaro.org>,
        "Luis R. Rodriguez" <mcgrof@suse.com>,
        Arnd Bergmann <arnd@arndb.de>,
        Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>,
        X86 ML <x86@kernel.org>, Thomas Gleixner <tglx@linutronix.de>,
        Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
        "H. Peter Anvin" <hpa@zytor.com>, linux-ia64@vger.kernel.org,
        Tony Luck <tony.luck@intel.com>,
        Fenghua Yu <fenghua.yu@intel.com>,
        Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
        Souptick Joarder <jrdr.linux@gmail.com>,
        dri-devel <dri-devel@lists.freedesktop.org>,
        Linux Fbdev development list <linux-fbdev@vger.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] video: fbdev: atyfb: only use ioremap_uc() on i386 and
 ia64
Message-ID: <20191113072708.GA3213@lst.de>
References: <20191111192258.2234502-1-arnd@arndb.de> <20191112105507.GA7122@lst.de> <CAKMK7uEEz1n+zuTs29rbPHU74Dspaib=prpMge63L_-rUk_o4A@mail.gmail.com> <20191112140631.GA10922@lst.de> <CAKMK7uFaA607rOS6x_FWjXQ2+Qdm8dQ1dQ+Oi-9if_Qh_wHWPg@mail.gmail.com> <20191112222423.GO11244@42.do-not-panic.com>
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On Tue, Nov 12, 2019 at 10:24:23PM +0000, Luis Chamberlain wrote:
> I think this would be possible if we could flop ioremap_nocache() to UC
> instead of UC- on x86. Otherwise, I can't see how we can remove this by
> still not allowing direct MTRR calls.

If everything goes well ioremap_nocache will be gone as of 5.5.