linux-kernel - Re: [PATCH v7 01/17] arm64: allow late use of early

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Message-ID: <54B80A92.6050209@redhat.com>
Date:	Thu, 15 Jan 2015 12:44:34 -0600
From:	Mark Langsdorf <mlangsdo@...hat.com>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Olof Johansson <olof@...om.net>, Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Grant Likely <grant.likely@...aro.org>,
	Will Deacon <will.deacon@....com>
CC:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Jason Cooper <jason@...edaemon.net>,
	Marc Zyngier <marc.zyngier@....com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Mark Brown <broonie@...nel.org>, Rob Herring <robh@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Randy Dunlap <rdunlap@...radead.org>,
	Charles.Garcia-Tobin@....com, phoenix.liyi@...wei.com,
	Timur Tabi <timur@...eaurora.org>,
	suravee.suthikulpanit@....com, wangyijing@...wei.com,
	linux-acpi@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linaro-acpi@...ts.linaro.org,
	Mark Salter <msalter@...hat.com>,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v7 01/17] arm64: allow late use of early_ioremap

On 01/14/2015 09:04 AM, Hanjun Guo wrote:
> From: Mark Salter <msalter@...hat.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@...hat.com>
> CC: Leif Lindholm <leif.lindholm@...aro.org>
> CC: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> [hj: update the change log]
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
> ---
Tested-by: Mark Langsdorf <mlangsdo@...hat.com>

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