[lkml]   [2015]   [Feb]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[PATCH v9 04/21] ARM64: allow late use of early_ioremap
From: Mark Salter <>

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 <>
CC: Ard Biesheuvel <>
Tested-by: Suravee Suthikulpanit <>
Tested-by: Mark Langsdorf <>
Tested-by: Jon Masters <>
Tested-by: Robert Richter <>
Acked-by: Robert Richter <>
Signed-off-by: Mark Salter <>
Signed-off-by: Hanjun Guo <>
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>

 \ /
  Last update: 2015-02-25 10:21    [W:1.365 / U:0.080 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site