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Optimize pmap_pml4e() and pmap_pdpe() based upon two observations: The

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given pmap is never NULL, and therefore pmap_pml4e() can never return
NULL.  The pervasive use of these inline functions throughout the pmap
makes these simple changes worthwhile.
This commit is contained in:
Alan Cox 2008-04-02 04:39:47 +00:00
parent 8bf1a48cb3
commit bc8a0d87bd
1 changed files with 1 additions and 3 deletions
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4
sys/amd64/amd64/pmap.c
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@ -318,8 +318,6 @@ static __inline pml4_entry_t *
pmap_pml4e(pmap_t pmap, vm_offset_t va)
{
if (!pmap)
return NULL;
return (&pmap->pm_pml4[pmap_pml4e_index(va)]);
}
@ -340,7 +338,7 @@ pmap_pdpe(pmap_t pmap, vm_offset_t va)
pml4_entry_t *pml4e;
pml4e = pmap_pml4e(pmap, va);
if (pml4e == NULL || (*pml4e & PG_V) == 0)
if ((*pml4e & PG_V) == 0)
return NULL;
return (pmap_pml4e_to_pdpe(pml4e, va));
}