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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>
This commit is contained in:
Aneesh Kumar K.V 2018-06-29 14:06:29 +05:30 committed by Michael Ellerman
parent 7d4340bb92
commit 1531cff44b
5 changed files with 20 additions and 24 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/powerpc/mm/dump_hashpagetable.c
View File

@ -260,7 +260,7 @@ static int pseries_find(unsigned long ea, int psize, bool primary, u64 *v, u64 *
/* to check in the secondary hash table, we invert the hash */
if (!primary)
hash = ~hash;
hpte_group = ((hash & htab_hash_mask) * HPTES_PER_GROUP) & ~0x7UL;
hpte_group = (hash & htab_hash_mask) * HPTES_PER_GROUP;
/* see if we can find an entry in the hpte with this hash */
for (i = 0; i < HPTES_PER_GROUP; i += 4, hpte_group += 4) {
lpar_rc = plpar_pte_read_4(0, hpte_group, (void *)ptes);

8
arch/powerpc/mm/hash64_4k.c
View File

@ -80,7 +80,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
hash = hpt_hash(vpn, shift, ssize);
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, 0,
@ -89,7 +89,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
* 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,
HPTE_V_SECONDARY,
@ -97,8 +97,8 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
MMU_PAGE_4K, 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);
/*
* FIXME!! Should be try the group from which we removed ?

15
arch/powerpc/mm/hash64_64k.c
View File

@ -154,7 +154,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
}
hash = hpt_hash(vpn, shift, ssize);
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, 0,
@ -165,7 +165,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
if (unlikely(slot == -1)) {
bool soft_invalid;
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, HPTE_V_SECONDARY,
MMU_PAGE_4K, MMU_PAGE_4K,
@ -193,8 +193,7 @@ int __hash_page_4K(unsigned long ea, unsigned long access, unsigned long vsid,
* that we do not get the same soft-invalid slot.
*/
if (soft_invalid || (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);
/*
@ -288,7 +287,7 @@ int __hash_page_64K(unsigned long ea, unsigned long access,
hash = hpt_hash(vpn, shift, ssize);
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, 0,
@ -298,7 +297,7 @@ int __hash_page_64K(unsigned long ea, unsigned long access,
* 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,
HPTE_V_SECONDARY,
@ -306,8 +305,8 @@ int __hash_page_64K(unsigned long ea, unsigned long access,
MMU_PAGE_64K, 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);
/*
* FIXME!! Should be try the group from which we removed ?

10
arch/powerpc/mm/hash_utils_64.c
View File

@ -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 @@ long hpte_insert_repeating(unsigned long hash, unsigned long vpn,
/* 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;

9
arch/powerpc/mm/hugepage-hash64.c
View File

@ -128,7 +128,7 @@ int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid,
new_pmd |= H_PAGE_HASHPTE;
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, 0,
@ -137,16 +137,15 @@ int __hash_page_thp(unsigned long ea, unsigned long access, unsigned long vsid,
* 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,
HPTE_V_SECONDARY,
psize, lpsize, 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;