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arm64: memory: Simplify _VA_START and _PAGE_OFFSET definitions

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Rather than subtracting from -1 and then adding 1, we can simply
subtract from 0.

Tested-by: Steve Capper <steve.capper@arm.com>
Reviewed-by: Steve Capper <steve.capper@arm.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will@kernel.org>
This commit is contained in:
Will Deacon 2019-08-13 16:58:36 +01:00
parent 9ba33dcc6b
commit a5ac40f53b
1 changed files with 2 additions and 4 deletions
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6
arch/arm64/include/asm/memory.h
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@ -44,8 +44,7 @@
* VA_START - the first kernel virtual address.
*/
#define VA_BITS (CONFIG_ARM64_VA_BITS)
#define _PAGE_OFFSET(va) (UL(0xffffffffffffffff) - \
(UL(1) << (va)) + 1)
#define _PAGE_OFFSET(va) (-(UL(1) << (va)))
#define PAGE_OFFSET (_PAGE_OFFSET(VA_BITS))
#define KIMAGE_VADDR (MODULES_END)
#define BPF_JIT_REGION_START (KASAN_SHADOW_END)
@ -63,8 +62,7 @@
#else
#define VA_BITS_MIN (VA_BITS)
#endif
#define _VA_START(va) (UL(0xffffffffffffffff) - \
(UL(1) << ((va) - 1)) + 1)
#define _VA_START(va) (-(UL(1) << ((va) - 1)))
#define KERNEL_START _text
#define KERNEL_END _end