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mincore doesn't modify the vm_map. Therefore, it doesn't require

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an exclusive lock.  A read lock will suffice.
This commit is contained in:
Alan Cox 1999-03-01 20:42:16 +00:00
parent d560f7208b
commit eff50fcd4c
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=44379
1 changed files with 6 additions and 6 deletions
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12
sys/vm/vm_mmap.c
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@ -38,7 +38,7 @@
* from: Utah $Hdr: vm_mmap.c 1.6 91/10/21$
*
* @(#)vm_mmap.c 8.4 (Berkeley) 1/12/94
* $Id: vm_mmap.c,v 1.89 1999/02/07 21:48:22 dillon Exp $
* $Id: vm_mmap.c,v 1.90 1999/02/19 14:25:36 luoqi Exp $
*/
/*
@ -695,7 +695,7 @@ mincore(p, uap)
map = &p->p_vmspace->vm_map;
pmap = vmspace_pmap(p->p_vmspace);
vm_map_lock(map);
vm_map_lock_read(map);
if (!vm_map_lookup_entry(map, addr, &entry))
entry = entry->next;
@ -777,7 +777,7 @@ mincore(p, uap)
while((lastvecindex + 1) < vecindex) {
error = subyte( vec + lastvecindex, 0);
if (error) {
vm_map_unlock(map);
vm_map_unlock_read(map);
return (EFAULT);
}
++lastvecindex;
@ -788,7 +788,7 @@ mincore(p, uap)
*/
error = subyte( vec + vecindex, mincoreinfo);
if (error) {
vm_map_unlock(map);
vm_map_unlock_read(map);
return (EFAULT);
}
lastvecindex = vecindex;
@ -803,13 +803,13 @@ mincore(p, uap)
while((lastvecindex + 1) < vecindex) {
error = subyte( vec + lastvecindex, 0);
if (error) {
vm_map_unlock(map);
vm_map_unlock_read(map);
return (EFAULT);
}
++lastvecindex;
}
vm_map_unlock(map);
vm_map_unlock_read(map);
return (0);
}