linux-kernel - Re: [patch v11 03/23] ARM64: allow late use of early

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Message-ID: <20150325164354.GB14585@localhost>
Date:	Wed, 25 Mar 2015 16:43:54 +0000
From:	Catalin Marinas <catalin.marinas@....com>
To:	Hanjun Guo <hanjun.guo@...aro.org>
Cc:	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Olof Johansson <olof@...om.net>,
	Grant Likely <grant.likely@...aro.org>,
	Mark Rutland <mark.rutland@....com>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Robert Richter <rric@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	linaro-acpi@...ts.linaro.org, Marc Zyngier <marc.zyngier@....com>,
	Jon Masters <jcm@...hat.com>,
	Timur Tabi <timur@...eaurora.org>,
	Mark Salter <msalter@...hat.com>, linux-kernel@...r.kernel.org,
	Leif Lindholm <leif.lindholm@...aro.org>,
	Ard Biesheuvel <ard.biesheuvel@...aro.org>,
	linux-acpi@...r.kernel.org, Mark Brown <broonie@...nel.org>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
	Sudeep Holla <Sudeep.Holla@....com>,
	linux-arm-kernel@...ts.infradead.org
Subject: Re: [patch v11 03/23] ARM64: allow late use of early_ioremap

On Tue, Mar 24, 2015 at 10:02:36PM +0800, 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().
> 
> CC: Leif Lindholm <leif.lindholm@...aro.org>
> CC: Ard Biesheuvel <ard.biesheuvel@...aro.org>
> Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Tested-by: Mark Langsdorf <mlangsdo@...hat.com>
> Tested-by: Jon Masters <jcm@...hat.com>
> Tested-by: Robert Richter <rrichter@...ium.com>
> Tested-by: Timur Tabi <timur@...eaurora.org>
> Acked-by: Robert Richter <rrichter@...ium.com>
> Reviewed-by: Grant Likely <grant.likely@...aro.org>
> Signed-off-by: Mark Salter <msalter@...hat.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>

Acked-by: Catalin Marinas <catalin.marinas@....com>

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