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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2016-02-22 20:46:03 +0300
committerCatalin Marinas <catalin.marinas@arm.com>2016-02-23 20:42:11 +0300
commita92405f082d43267575444a6927085e4c8a69e4e (patch)
treeba1521809b1a95c228956628863c8d454cd0dff7 /arch/arm64/include
parent70c8abc28762d04e36c92e07eee2ce6ab41049cb (diff)
downloadlinux-a92405f082d43267575444a6927085e4c8a69e4e.tar.xz
arm64: mm: only perform memstart_addr sanity check if DEBUG_VM
Checking whether memstart_addr has been assigned every time it is referenced adds a branch instruction that may hurt performance if the reference in question occurs on a hot path. So only perform the check if CONFIG_DEBUG_VM=y. Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> [catalin.marinas@arm.com: replaced #ifdef with VM_BUG_ON] Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'arch/arm64/include')
-rw-r--r--arch/arm64/include/asm/memory.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
index 3239e4d78e0d..460d09bf9442 100644
--- a/arch/arm64/include/asm/memory.h
+++ b/arch/arm64/include/asm/memory.h
@@ -132,9 +132,11 @@
#ifndef __ASSEMBLY__
+#include <linux/mmdebug.h>
+
extern phys_addr_t memstart_addr;
/* PHYS_OFFSET - the physical address of the start of memory. */
-#define PHYS_OFFSET ({ BUG_ON(memstart_addr & 1); memstart_addr; })
+#define PHYS_OFFSET ({ VM_BUG_ON(memstart_addr & 1); memstart_addr; })
/* the offset between the kernel virtual and physical mappings */
extern u64 kimage_voffset;