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Eliminate recomputation of the PDE by pmap_pde_attr().

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This commit is contained in:
Alan Cox 2008-07-31 04:42:42 +00:00
parent a0bac9cc1b
commit c1695335d1
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=181043
1 changed files with 2 additions and 5 deletions
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7
sys/amd64/amd64/pmap.c
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@ -4270,13 +4270,10 @@ pmap_pte_attr(vm_offset_t va, int mode)
/* Adjust the cache mode for a 2MB page mapped via a PDE. */
static __inline void
pmap_pde_attr(vm_offset_t va, int mode)
pmap_pde_attr(pd_entry_t *pde, int mode)
{
pd_entry_t *pde;
u_int opde, npde;
pde = pmap_pde(kernel_pmap, va);
/*
* The cache mode bits are all in the low 32-bits of the
* PDE, so we can just spin on updating the low 32-bits.
@ -4420,7 +4417,7 @@ pmap_change_attr(vm_offset_t va, vm_size_t size, int mode)
for (tmpva = base; size > 0; ) {
pde = pmap_pde(kernel_pmap, tmpva);
if (*pde & PG_PS) {
pmap_pde_attr(tmpva, mode);
pmap_pde_attr(pde, mode);
tmpva += NBPDR;
size -= NBPDR;
} else {