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vm_map: Add a macro to fetch a map entry's split boundary index

Browse source 
The resulting code is a bit more concise.  No functional change
intended.

Reviewed by:	alc, dougm, kib
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D41249
This commit is contained in:
Mark Johnston 2023-05-09 10:07:15 -04:00
parent 135c2b7156
commit d0e4e53ebd
3 changed files with 8 additions and 12 deletions
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3
sys/vm/vm_fault.c
View file

@ -539,8 +539,7 @@ vm_fault_populate(struct faultstate *fs)
MPASS(pager_last < fs->first_object->size);
vm_fault_restore_map_lock(fs);
bdry_idx = (fs->entry->eflags & MAP_ENTRY_SPLIT_BOUNDARY_MASK) >>
MAP_ENTRY_SPLIT_BOUNDARY_SHIFT;
bdry_idx = MAP_ENTRY_SPLIT_BOUNDARY_INDEX(fs->entry);
if (fs->map->timestamp != fs->map_generation) {
if (bdry_idx == 0) {
vm_fault_populate_cleanup(fs->first_object, pager_first,

13
sys/vm/vm_map.c
View file

@ -2449,8 +2449,7 @@ vm_map_clip_start(vm_map_t map, vm_map_entry_t entry, vm_offset_t startaddr)
KASSERT(entry->end > startaddr && entry->start < startaddr,
("%s: invalid clip of entry %p", __func__, entry));
bdry_idx = (entry->eflags & MAP_ENTRY_SPLIT_BOUNDARY_MASK) >>
MAP_ENTRY_SPLIT_BOUNDARY_SHIFT;
bdry_idx = MAP_ENTRY_SPLIT_BOUNDARY_INDEX(entry);
if (bdry_idx != 0) {
if ((startaddr & (pagesizes[bdry_idx] - 1)) != 0)
return (KERN_INVALID_ARGUMENT);
@ -2523,8 +2522,7 @@ vm_map_clip_end(vm_map_t map, vm_map_entry_t entry, vm_offset_t endaddr)
KASSERT(entry->start < endaddr && entry->end > endaddr,
("%s: invalid clip of entry %p", __func__, entry));
bdry_idx = (entry->eflags & MAP_ENTRY_SPLIT_BOUNDARY_MASK) >>
MAP_ENTRY_SPLIT_BOUNDARY_SHIFT;
bdry_idx = MAP_ENTRY_SPLIT_BOUNDARY_INDEX(entry);
if (bdry_idx != 0) {
if ((endaddr & (pagesizes[bdry_idx] - 1)) != 0)
return (KERN_INVALID_ARGUMENT);
@ -3516,8 +3514,7 @@ vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
saved_start = entry->start;
saved_end = entry->end;
last_timestamp = map->timestamp;
bidx = (entry->eflags & MAP_ENTRY_SPLIT_BOUNDARY_MASK)
>> MAP_ENTRY_SPLIT_BOUNDARY_SHIFT;
bidx = MAP_ENTRY_SPLIT_BOUNDARY_INDEX(entry);
incr = pagesizes[bidx];
vm_map_busy(map);
vm_map_unlock(map);
@ -3715,9 +3712,7 @@ vm_map_sync(
vm_map_unlock_read(map);
return (KERN_INVALID_ARGUMENT);
}
bdry_idx = (entry->eflags &
MAP_ENTRY_SPLIT_BOUNDARY_MASK) >>
MAP_ENTRY_SPLIT_BOUNDARY_SHIFT;
bdry_idx = MAP_ENTRY_SPLIT_BOUNDARY_INDEX(entry);
if (bdry_idx != 0 &&
((start & (pagesizes[bdry_idx] - 1)) != 0 ||
(end & (pagesizes[bdry_idx] - 1)) != 0)) {

4
sys/vm/vm_map.h
View file

@ -154,8 +154,10 @@ struct vm_map_entry {
#define MAP_ENTRY_HEADER 0x00080000
#define MAP_ENTRY_SPLIT_BOUNDARY_MASK 0x00300000
#define MAP_ENTRY_SPLIT_BOUNDARY_SHIFT 20
#define MAP_ENTRY_SPLIT_BOUNDARY_INDEX(entry) \
(((entry)->eflags & MAP_ENTRY_SPLIT_BOUNDARY_MASK) >> \
MAP_ENTRY_SPLIT_BOUNDARY_SHIFT)
#ifdef _KERNEL
static __inline u_char