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 <rmk+kernel@arm.linux.org.uk>
Reviewed-by: Pratyush Anand <panand@redhat.com>

diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
index ca20833..31c07a2 100644 (file)
--- 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)