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| author | Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> | 2018-06-29 14:06:29 +0530 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-07-24 22:03:17 +1000 |
| commit | 1531cff44b5bb30c899404c044805ec60b2f3620 (patch) | |
| tree | e8a6080121f8265944405aa446677af64c7b54c1 /arch/powerpc/mm/hash_utils_64.c | |
| parent | 7d4340bb92a9df78e6e28152f3dd89d9bd82146b (diff) | |
| download | linux-stable-1531cff44b5bb30c899404c044805ec60b2f3620.tar.gz linux-stable-1531cff44b5bb30c899404c044805ec60b2f3620.tar.bz2 linux-stable-1531cff44b5bb30c899404c044805ec60b2f3620.zip | |
powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group
When computing the starting slot number for a hash page table group we used
to do this
hpte_group = ((hash & htab_hash_mask) * HPTES_PER_GROUP) & ~0x7UL;
Multiplying with 8 (HPTES_PER_GROUP) imply the last three bits are 0. Hence we
really don't need to clear then separately.
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/hash_utils_64.c')
| -rw-r--r-- | arch/powerpc/mm/hash_utils_64.c | 10 |
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c index 5a72e980e25a..743c8dbe1941 100644 --- a/arch/powerpc/mm/hash_utils_64.c +++ b/arch/powerpc/mm/hash_utils_64.c @@ -1753,8 +1753,7 @@ long hpte_insert_repeating(unsigned long hash, unsigned long vpn, long slot; repeat: - hpte_group = ((hash & htab_hash_mask) * - HPTES_PER_GROUP) & ~0x7UL; + hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP; /* Insert into the hash table, primary slot */ slot = mmu_hash_ops.hpte_insert(hpte_group, vpn, pa, rflags, vflags, @@ -1762,15 +1761,14 @@ repeat: /* Primary is full, try the secondary */ if (unlikely(slot == -1)) { - hpte_group = ((~hash & htab_hash_mask) * - HPTES_PER_GROUP) & ~0x7UL; + hpte_group = (~hash & htab_hash_mask) * HPTES_PER_GROUP; slot = mmu_hash_ops.hpte_insert(hpte_group, vpn, pa, rflags, vflags | HPTE_V_SECONDARY, psize, psize, ssize); if (slot == -1) { if (mftb() & 0x1) - hpte_group = ((hash & htab_hash_mask) * - HPTES_PER_GROUP)&~0x7UL; + hpte_group = (hash & htab_hash_mask) * + HPTES_PER_GROUP; mmu_hash_ops.hpte_remove(hpte_group); goto repeat; |