[PATCH 04/12] ARM: provide arm_has_idmap_alias() helper
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- To: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
- Subject: [PATCH 04/12] ARM: provide arm_has_idmap_alias() helper
- From: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
- Date: Thu, 28 Apr 2016 10:28:04 +0100
- Cc: devicetree@xxxxxxxxxxxxxxx, Eric Biederman <ebiederm@xxxxxxxxxxxx>, Fenghua Yu <fenghua.yu@xxxxxxxxx>, Haren Myneni <hbabu@xxxxxxxxxx>, Ian Campbell <ijc+devicetree@xxxxxxxxxxxxxx>, Jonathan Corbet <corbet@xxxxxxx>, kexec@xxxxxxxxxxxxxxxxxxx, Kumar Gala <galak@xxxxxxxxxxxxxx>, linux-doc@xxxxxxxxxxxxxxx, linux-ia64@xxxxxxxxxxxxxxx, Mark Rutland <mark.rutland@xxxxxxx>, Pawel Moll <pawel.moll@xxxxxxx>, Rob Herring <robh+dt@xxxxxxxxxx>, Santosh Shilimkar <ssantosh@xxxxxxxxxx>, Tony Luck <tony.luck@xxxxxxxxx>, Vivek Goyal <vgoyal@xxxxxxxxxx>
- In-reply-to: <20160428092644.GX19428@n2100.arm.linux.org.uk>
- List-id: <linux-ia64.vger.kernel.org>
- References: <20160428092644.GX19428@n2100.arm.linux.org.uk>
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@xxxxxxxxxxxxxxxx>
---
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)
--
2.1.0
--
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