From 07a7056ccce3ffdb65908bf502aeb2503714da46 Mon Sep 17 00:00:00 2001 From: Russell King Date: Tue, 15 Mar 2016 15:00:30 +0000 Subject: [PATCH] ARM: provide arm_has_idmap_alias() helper Provide a helper to indicate whether we need to perform special handling for boot identity mapping aliases or not. Signed-off-by: Russell King Reviewed-by: Pratyush Anand --- arch/arm/include/asm/memory.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index ca208335fde6..31c07a2cc100 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -295,6 +295,11 @@ extern long long arch_phys_to_idmap_offset; * of physical memory for idmap purposes. Most cases should leave these * untouched. Note: this can only return addresses less than 4GiB. */ +static inline bool arm_has_idmap_alias(void) +{ + return IS_ENABLED(CONFIG_MMU) && arch_phys_to_idmap_offset != 0; +} + #define IDMAP_INVALID_ADDR ((u32)~0) static inline unsigned long phys_to_idmap(phys_addr_t addr) -- 2.20.1