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Date: Thu, 15 Jan 2015 12:44:34 -0600
From: Mark Langsdorf <mlangsdo@redhat.com>
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To: Hanjun Guo <hanjun.guo@linaro.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        "Rafael J. Wysocki" <rjw@rjwysocki.net>,
        Olof Johansson <olof@lixom.net>, Arnd Bergmann <arnd@arndb.de>,
        Mark Rutland <mark.rutland@arm.com>,
        Grant Likely <grant.likely@linaro.org>,
        Will Deacon <will.deacon@arm.com>
CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>,
        Graeme Gregory <graeme.gregory@linaro.org>,
        Sudeep Holla <Sudeep.Holla@arm.com>, Jon Masters <jcm@redhat.com>,
        Jason Cooper <jason@lakedaemon.net>,
        Marc Zyngier <marc.zyngier@arm.com>,
        Bjorn Helgaas <bhelgaas@google.com>, Mark Brown <broonie@kernel.org>,
        Rob Herring <robh@kernel.org>, Robert Richter <rric@kernel.org>,
        Randy Dunlap <rdunlap@infradead.org>, Charles.Garcia-Tobin@arm.com,
        phoenix.liyi@huawei.com, Timur Tabi <timur@codeaurora.org>,
        suravee.suthikulpanit@amd.com, wangyijing@huawei.com,
        linux-acpi@vger.kernel.org, linux-arm-kernel@lists.infradead.org,
        linux-kernel@vger.kernel.org, linaro-acpi@lists.linaro.org,
        Mark Salter <msalter@redhat.com>,
        Leif Lindholm <leif.lindholm@linaro.org>,
        Ard Biesheuvel <ard.biesheuvel@linaro.org>
Subject: Re: [PATCH v7 01/17] arm64: allow late use of early_ioremap
References: <1421247905-3749-1-git-send-email-hanjun.guo@linaro.org> <1421247905-3749-2-git-send-email-hanjun.guo@linaro.org>
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On 01/14/2015 09:04 AM, Hanjun Guo wrote:
> From: Mark Salter <msalter@redhat.com>
>
> Commit 0e63ea48b4d8 (arm64/efi: add missing call to early_ioremap_reset())
> added a missing call to early_ioremap_reset(). This triggers a BUG if code
> tries using early_ioremap() after the early_ioremap_reset(). This is a
> problem for some ACPI code which needs short-lived temporary mappings
> after paging_init() but before acpi_early_init() in start_kernel(). This
> patch adds definitions for the __late_set_fixmap() and __late_clear_fixmap()
> which avoids the BUG by allowing later use of early_ioremap().
>
> Signed-off-by: Mark Salter <msalter@redhat.com>
> CC: Leif Lindholm <leif.lindholm@linaro.org>
> CC: Ard Biesheuvel <ard.biesheuvel@linaro.org>
> [hj: update the change log]
> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
> ---
Tested-by: Mark Langsdorf <mlangsdo@redhat.com>