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Commit a92405f0 authored by Ard Biesheuvel's avatar Ard Biesheuvel Committed by Catalin Marinas
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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: default avatarArd Biesheuvel <ard.biesheuvel@linaro.org>
[catalin.marinas@arm.com: replaced #ifdef with VM_BUG_ON]
Signed-off-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
parent 70c8abc2

arch/arm64/include/asm/memory.h

+3 −1
Original line number Diff line number Diff line
@@ -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;