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Use switch statements in pmap_remove_pages. While only one level of

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pagetable is supported more will be added soon to support removing
superpages.

Obtained from:	ABT Systems Ltd
MFC after:	1 month
Sponsored by:	The FreeBSD Foundation
This commit is contained in:
Andrew Turner 2016-08-22 14:53:39 +00:00
parent c114e74120
commit c7d40f1843
1 changed files with 30 additions and 14 deletions
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44
sys/arm64/arm64/pmap.c
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@ -3115,14 +3115,21 @@ pmap_remove_pages(pmap_t pmap)
pde = pmap_pde(pmap, pv->pv_va, &lvl);
KASSERT(pde != NULL,
("Attempting to remove an unmapped page"));
KASSERT(lvl == 2,
("Invalid page directory level: %d", lvl));
pte = pmap_l2_to_l3(pde, pv->pv_va);
KASSERT(pte != NULL,
("Attempting to remove an unmapped page"));
tpte = pmap_load(pte);
switch(lvl) {
case 2:
pte = pmap_l2_to_l3(pde, pv->pv_va);
tpte = pmap_load(pte);
KASSERT((tpte & ATTR_DESCR_MASK) ==
L3_PAGE,
("Attempting to remove an invalid "
"page: %lx", tpte));
break;
default:
panic(
"Invalid page directory level: %d",
lvl);
}
/*
* We cannot remove wired pages from a process' mapping at this time
@ -3156,18 +3163,27 @@ pmap_remove_pages(pmap_t pmap)
/*
* Update the vm_page_t clean/reference bits.
*/
if ((tpte & ATTR_AP_RW_BIT) == ATTR_AP(ATTR_AP_RW))
vm_page_dirty(m);
if ((tpte & ATTR_AP_RW_BIT) ==
ATTR_AP(ATTR_AP_RW)) {
switch (lvl) {
case 2:
vm_page_dirty(m);
break;
}
}
CHANGE_PV_LIST_LOCK_TO_VM_PAGE(&lock, m);
/* Mark free */
pc->pc_map[field] |= bitmask;
pmap_resident_count_dec(pmap, 1);
TAILQ_REMOVE(&m->md.pv_list, pv, pv_next);
m->md.pv_gen++;
switch (lvl) {
case 2:
pmap_resident_count_dec(pmap, 1);
TAILQ_REMOVE(&m->md.pv_list, pv,
pv_next);
m->md.pv_gen++;
break;
}
pmap_unuse_l3(pmap, pv->pv_va, pmap_load(pde),
&free);
freed++;