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Change boolean_t variables in vm_map_unwire and vm_map_wire_locked to

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bool. Drop result variable. Add holes_ok bool to replace repeated
masking of flags parameter.

Approved by: markj (mentor)
Differential Revision: https://reviews.freebsd.org/D20846
This commit is contained in:
Doug Moore 2019-07-04 19:12:13 +00:00
parent 723413be0c
commit 9a0cdf9440
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=349743
1 changed files with 35 additions and 36 deletions
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71
sys/vm/vm_map.c
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@ -2849,15 +2849,16 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
vm_offset_t saved_start;
unsigned int last_timestamp;
int rv;
boolean_t need_wakeup, result, user_unwire;
bool holes_ok, need_wakeup, user_unwire;
if (start == end)
return (KERN_SUCCESS);
user_unwire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
holes_ok = (flags & VM_MAP_WIRE_HOLESOK) != 0;
user_unwire = (flags & VM_MAP_WIRE_USER) != 0;
vm_map_lock(map);
VM_MAP_RANGE_CHECK(map, start, end);
if (!vm_map_lookup_entry(map, start, &first_entry)) {
if (flags & VM_MAP_WIRE_HOLESOK)
if (holes_ok)
first_entry = first_entry->next;
else {
vm_map_unlock(map);
@ -2889,7 +2890,7 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
*/
if (!vm_map_lookup_entry(map, saved_start,
&tmp_entry)) {
if (flags & VM_MAP_WIRE_HOLESOK)
if (holes_ok)
tmp_entry = tmp_entry->next;
else {
if (saved_start == start) {
@ -2926,9 +2927,9 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
entry->wiring_thread = curthread;
/*
* Check the map for holes in the specified region.
* If VM_MAP_WIRE_HOLESOK was specified, skip this check.
* If holes_ok, skip this check.
*/
if (((flags & VM_MAP_WIRE_HOLESOK) == 0) &&
if (!holes_ok &&
(entry->end < end && entry->next->start > entry->end)) {
end = entry->end;
rv = KERN_INVALID_ADDRESS;
@ -2947,17 +2948,15 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
}
rv = KERN_SUCCESS;
done:
need_wakeup = FALSE;
if (first_entry == NULL) {
result = vm_map_lookup_entry(map, start, &first_entry);
if (!result && (flags & VM_MAP_WIRE_HOLESOK))
first_entry = first_entry->next;
else
KASSERT(result, ("vm_map_unwire: lookup failed"));
need_wakeup = false;
if (first_entry == NULL &&
!vm_map_lookup_entry(map, start, &first_entry)) {
KASSERT(holes_ok, ("vm_map_unwire: lookup failed"));
first_entry = first_entry->next;
}
for (entry = first_entry; entry->start < end; entry = entry->next) {
/*
* If VM_MAP_WIRE_HOLESOK was specified, an empty
* If holes_ok was specified, an empty
* space in the unwired region could have been mapped
* while the map lock was dropped for draining
* MAP_ENTRY_IN_TRANSITION. Moreover, another thread
@ -2967,7 +2966,7 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
*/
if ((entry->eflags & MAP_ENTRY_IN_TRANSITION) == 0 ||
entry->wiring_thread != curthread) {
KASSERT((flags & VM_MAP_WIRE_HOLESOK) != 0,
KASSERT(holes_ok,
("vm_map_unwire: !HOLESOK and new/changed entry"));
continue;
}
@ -2989,7 +2988,7 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
entry->wiring_thread = NULL;
if (entry->eflags & MAP_ENTRY_NEEDS_WAKEUP) {
entry->eflags &= ~MAP_ENTRY_NEEDS_WAKEUP;
need_wakeup = TRUE;
need_wakeup = true;
}
vm_map_simplify_entry(map, entry);
}
@ -3083,7 +3082,7 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
u_long npages;
u_int last_timestamp;
int rv;
boolean_t need_wakeup, result, user_wire;
bool holes_ok, need_wakeup, user_wire;
vm_prot_t prot;
VM_MAP_ASSERT_LOCKED(map);
@ -3093,10 +3092,11 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
prot = 0;
if (flags & VM_MAP_WIRE_WRITE)
prot |= VM_PROT_WRITE;
user_wire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
holes_ok = (flags & VM_MAP_WIRE_HOLESOK) != 0;
user_wire = (flags & VM_MAP_WIRE_USER) != 0;
VM_MAP_RANGE_CHECK(map, start, end);
if (!vm_map_lookup_entry(map, start, &first_entry)) {
if (flags & VM_MAP_WIRE_HOLESOK)
if (holes_ok)
first_entry = first_entry->next;
else
return (KERN_INVALID_ADDRESS);
@ -3126,7 +3126,7 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
*/
if (!vm_map_lookup_entry(map, saved_start,
&tmp_entry)) {
if (flags & VM_MAP_WIRE_HOLESOK)
if (holes_ok)
tmp_entry = tmp_entry->next;
else {
if (saved_start == start) {
@ -3163,7 +3163,7 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
if ((entry->protection & (VM_PROT_READ | VM_PROT_EXECUTE)) == 0
|| (entry->protection & prot) != prot) {
entry->eflags |= MAP_ENTRY_WIRE_SKIPPED;
if ((flags & VM_MAP_WIRE_HOLESOK) == 0) {
if (!holes_ok) {
end = entry->end;
rv = KERN_INVALID_ADDRESS;
goto done;
@ -3208,9 +3208,10 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
* may have been clipped, but NOT merged or
* deleted.
*/
result = vm_map_lookup_entry(map, saved_start,
&tmp_entry);
KASSERT(result, ("vm_map_wire: lookup failed"));
if (!vm_map_lookup_entry(map, saved_start,
&tmp_entry))
KASSERT(false,
("vm_map_wire: lookup failed"));
if (entry == first_entry)
first_entry = tmp_entry;
else
@ -3244,9 +3245,9 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
}
/*
* Check the map for holes in the specified region.
* If VM_MAP_WIRE_HOLESOK was specified, skip this check.
* If holes_ok was specified, skip this check.
*/
if ((flags & VM_MAP_WIRE_HOLESOK) == 0 &&
if (!holes_ok &&
entry->end < end && entry->next->start > entry->end) {
end = entry->end;
rv = KERN_INVALID_ADDRESS;
@ -3256,17 +3257,15 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
}
rv = KERN_SUCCESS;
done:
need_wakeup = FALSE;
if (first_entry == NULL) {
result = vm_map_lookup_entry(map, start, &first_entry);
if (!result && (flags & VM_MAP_WIRE_HOLESOK))
first_entry = first_entry->next;
else
KASSERT(result, ("vm_map_wire: lookup failed"));
need_wakeup = false;
if (first_entry == NULL &&
!vm_map_lookup_entry(map, start, &first_entry)) {
KASSERT(holes_ok, ("vm_map_wire: lookup failed"));
first_entry = first_entry->next;
}
for (entry = first_entry; entry->start < end; entry = entry->next) {
/*
* If VM_MAP_WIRE_HOLESOK was specified, an empty
* If holes_ok was specified, an empty
* space in the unwired region could have been mapped
* while the map lock was dropped for faulting in the
* pages or draining MAP_ENTRY_IN_TRANSITION.
@ -3276,7 +3275,7 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
*/
if ((entry->eflags & MAP_ENTRY_IN_TRANSITION) == 0 ||
entry->wiring_thread != curthread) {
KASSERT((flags & VM_MAP_WIRE_HOLESOK) != 0,
KASSERT(holes_ok,
("vm_map_wire: !HOLESOK and new/changed entry"));
continue;
}
@ -3317,7 +3316,7 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
entry->wiring_thread = NULL;
if (entry->eflags & MAP_ENTRY_NEEDS_WAKEUP) {
entry->eflags &= ~MAP_ENTRY_NEEDS_WAKEUP;
need_wakeup = TRUE;
need_wakeup = true;
}
vm_map_simplify_entry(map, entry);
}