From: Mark Salter msalter@redhat.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@linaro.org CC: Ard Biesheuvel ard.biesheuvel@linaro.org Tested-by: Suravee Suthikulpanit Suravee.Suthikulpanit@amd.com Tested-by: Mark Langsdorf mlangsdo@redhat.com Tested-by: Jon Masters jcm@redhat.com Tested-by: Robert Richter rrichter@cavium.com Acked-by: Robert Richter rrichter@cavium.com Signed-off-by: Mark Salter msalter@redhat.com Signed-off-by: Hanjun Guo hanjun.guo@linaro.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 9ef6eca..e629c70 100644 --- a/arch/arm64/include/asm/fixmap.h +++ b/arch/arm64/include/asm/fixmap.h @@ -61,6 +61,9 @@ 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>