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MFamd64 r313933: microoptimize pmap_protect_pte1().

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Noted by:	alc
Tested by:	mmel
Sponsored by:	The FreeBSD Foundation
MFC after:	1 week
This commit is contained in:
Konstantin Belousov 2017-02-19 20:40:07 +00:00
parent 5057f65606
commit 901b55218f
1 changed files with 2 additions and 3 deletions
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5
sys/arm/arm/pmap-v6.c
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@ -4799,12 +4799,11 @@ pmap_protect_pte1(pmap_t pmap, pt1_entry_t *pte1p, vm_offset_t sva,
("%s: sva is not 1mpage aligned", __func__));
opte1 = npte1 = pte1_load(pte1p);
if (pte1_is_managed(opte1)) {
if (pte1_is_managed(opte1) && pte1_is_dirty(opte1)) {
eva = sva + PTE1_SIZE;
for (va = sva, m = PHYS_TO_VM_PAGE(pte1_pa(opte1));
va < eva; va += PAGE_SIZE, m++)
if (pte1_is_dirty(opte1))
vm_page_dirty(m);
vm_page_dirty(m);
}
if ((prot & VM_PROT_WRITE) == 0)
npte1 |= PTE1_RO | PTE1_NM;