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Message-Id: <1427205776-5060-4-git-send-email-hanjun.guo@linaro.org>
Date: Tue, 24 Mar 2015 22:02:36 +0800
From: Hanjun Guo <hanjun.guo@...aro.org>
To: Catalin Marinas <catalin.marinas@....com>,
"Rafael J. Wysocki" <rjw@...ysocki.net>,
Will Deacon <will.deacon@....com>,
Olof Johansson <olof@...om.net>,
Grant Likely <grant.likely@...aro.org>
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 <suravee.suthikulpanit@....com>,
Mark Salter <msalter@...hat.com>, linux-acpi@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
linaro-acpi@...ts.linaro.org,
Leif Lindholm <leif.lindholm@...aro.org>,
Ard Biesheuvel <ard.biesheuvel@...aro.org>,
Hanjun Guo <hanjun.guo@...aro.org>
Subject: [patch v11 03/23] ARM64: allow late use of early_ioremap
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>
---
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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