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| author | Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com> | 2019-04-17 15:59:17 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-04-21 16:12:40 +0300 |
| commit | 1c946c1b7f2ba40bc9b521219ad34e5da3fc3088 (patch) | |
| tree | 17e48a3b636c8479cd97c42cc33a5770f5e788ec /arch/powerpc/include/asm/book3s/64/hash-4k.h | |
| parent | 53ed7a5947de2e19c270a0bc0c29257c6d004b0f (diff) | |
| download | linux-1c946c1b7f2ba40bc9b521219ad34e5da3fc3088.tar.xz | |
powerpc/mm/hash: Simplify the region id calculation.
This reduces multiple comparisons in get_region_id to a bit shift operation.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include/asm/book3s/64/hash-4k.h')
| -rw-r--r-- | arch/powerpc/include/asm/book3s/64/hash-4k.h | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/book3s/64/hash-4k.h b/arch/powerpc/include/asm/book3s/64/hash-4k.h index 4c9dfd625461..8fd8599c9395 100644 --- a/arch/powerpc/include/asm/book3s/64/hash-4k.h +++ b/arch/powerpc/include/asm/book3s/64/hash-4k.h @@ -13,12 +13,14 @@ */ #define MAX_EA_BITS_PER_CONTEXT 46 +#define REGION_SHIFT (MAX_EA_BITS_PER_CONTEXT - 2) + /* * Our page table limit us to 64TB. Hence for the kernel mapping, * each MAP area is limited to 16 TB. * The four map areas are: linear mapping, vmap, IO and vmemmap */ -#define H_KERN_MAP_SIZE (ASM_CONST(1) << (MAX_EA_BITS_PER_CONTEXT - 2)) +#define H_KERN_MAP_SIZE (ASM_CONST(1) << REGION_SHIFT) /* * Define the address range of the kernel non-linear virtual area |