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MFamd64

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Make three simplifications to pmap_ts_referenced():
   Eliminate an initialized but otherwise unused variable.
   Eliminate an unnecessary test.
   Exit the loop in a shorter way.
This commit is contained in:
alc 2006-07-16 21:05:58 +00:00
parent 3a5f5a844f
commit ae11c9115b
1 changed files with 3 additions and 6 deletions
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9
sys/i386/i386/pmap.c
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@ -3150,7 +3150,6 @@ pmap_ts_referenced(vm_page_t m)
pv_entry_t pv, pvf, pvn;
pmap_t pmap;
pt_entry_t *pte;
pt_entry_t v;
int rtval = 0;
if (m->flags & PG_FICTITIOUS)
@ -3166,14 +3165,12 @@ pmap_ts_referenced(vm_page_t m)
pmap = PV_PMAP(pv);
PMAP_LOCK(pmap);
pte = pmap_pte_quick(pmap, pv->pv_va);
if (pte && ((v = pte_load(pte)) & PG_A) != 0) {
if ((*pte & PG_A) != 0) {
atomic_clear_int((u_int *)pte, PG_A);
pmap_invalidate_page(pmap, pv->pv_va);
rtval++;
if (rtval > 4) {
PMAP_UNLOCK(pmap);
break;
}
if (rtval > 4)
pvn = NULL;
}
PMAP_UNLOCK(pmap);
} while ((pv = pvn) != NULL && pv != pvf);