From: Ard Biesheuvel Date: Mon, 22 Feb 2016 17:46:03 +0000 (+0100) Subject: arm64: mm: only perform memstart_addr sanity check if DEBUG_VM X-Git-Tag: v4.14-rc1~3543^2~56 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=a92405f082d43267575444a6927085e4c8a69e4e;p=platform%2Fkernel%2Flinux-rpi.git 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 [catalin.marinas@arm.com: replaced #ifdef with VM_BUG_ON] Signed-off-by: Catalin Marinas --- diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h index 3239e4d..460d09b 100644 --- a/arch/arm64/include/asm/memory.h +++ b/arch/arm64/include/asm/memory.h @@ -132,9 +132,11 @@ #ifndef __ASSEMBLY__ +#include + 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;