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authorRussell King <rmk+kernel@arm.linux.org.uk>2016-03-15 15:00:30 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2016-05-03 11:17:28 +0100
commit07a7056ccce3ffdb65908bf502aeb2503714da46 (patch)
treeb279010101294be5e39e682771dd118c6276b23f /arch/arm/include
parentARM: kexec: remove 512MB restriction on kexec crashdump (diff)
downloadlinux-dev-07a7056ccce3ffdb65908bf502aeb2503714da46.tar.xz
linux-dev-07a7056ccce3ffdb65908bf502aeb2503714da46.zip
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>
Diffstat (limited to 'arch/arm/include')
-rw-r--r--arch/arm/include/asm/memory.h5
1 files changed, 5 insertions, 0 deletions
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)