linux-kernel - Re: [PATCH v9 04/21] ARM64: allow late use of early

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Message-Id: <20150306202400.7EF9BC40AA9@trevor.secretlab.ca>
Date:	Fri, 06 Mar 2015 20:24:00 +0000
From:	Grant Likely <grant.likely@...aro.org>
To:	Hanjun Guo <hanjun.guo@...aro.org>,
	Catalin Marinas <catalin.marinas@....com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Will Deacon <will.deacon@....com>,
	Olof Johansson <olof@...om.net>
Cc:	Lorenzo Pieralisi <Lorenzo.Pieralisi@....com>,
	Arnd Bergmann <arnd@...db.de>,
	Mark Rutland <mark.rutland@....com>,
	Graeme Gregory <graeme.gregory@...aro.org>,
	Sudeep Holla <Sudeep.Holla@....com>,
	Jon Masters <jcm@...hat.com>,
	Marc Zyngier <marc.zyngier@....com>,
	Mark Brown <broonie@...nel.org>,
	Robert Richter <rric@...nel.org>,
	Timur Tabi <timur@...eaurora.org>,
	Ashwin Chaugule <ashwinc@...eaurora.org>,
	suravee.suthikulpanit@....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>,
	Hanjun Guo <hanjun.guo@...aro.org>
Subject: Re: [PATCH v9 04/21] ARM64: allow late use of early_ioremap

On Wed, 25 Feb 2015 16:39:44 +0800
, Hanjun Guo <hanjun.guo@...aro.org>
 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>
> Acked-by: Robert Richter <rrichter@...ium.com>
> Signed-off-by: Mark Salter <msalter@...hat.com>
> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>

Reviewed-by: Grant Likely <grant.likely@...aro.org>

> ---
>  arch/arm64/include/asm/fixmap.h | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h
> index defa0ff9..f196e40 100644
> --- a/arch/arm64/include/asm/fixmap.h
> +++ b/arch/arm64/include/asm/fixmap.h
> @@ -62,6 +62,9 @@ void __init early_fixmap_init(void);
>  
>  #define __early_set_fixmap __set_fixmap
>  
> +#define __late_set_fixmap __set_fixmap
> +#define __late_clear_fixmap(idx) __set_fixmap((idx), 0, FIXMAP_PAGE_CLEAR)
> +
>  extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot);
>  
>  #include <asm-generic/fixmap.h>
> -- 
> 1.9.1
> 

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