From b2cedba09dd7034c144c03eadc09ee1e4d791590 Mon Sep 17 00:00:00 2001 From: Mark Salter Date: Tue, 24 Mar 2015 14:02:36 +0000 Subject: [PATCH] ARM64: allow late use of early_ioremap 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 Tested-by: Timur Tabi Acked-by: Robert Richter Reviewed-by: Grant Likely Signed-off-by: Mark Salter Signed-off-by: Hanjun Guo Signed-off-by: Will Deacon --- 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 defa0ff98250..f196e408a35c 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