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- Add vm object locking to vm_pgmoveco().

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- Add a comment to vm_pgmoveco() describing what remains to be done
   for vm locking.
This commit is contained in:
Alan Cox 2003-06-09 19:23:03 +00:00
parent 3adb4d32aa
commit 4412dc5468
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=116110
1 changed files with 5 additions and 2 deletions
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7
sys/kern/kern_subr.c
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@ -85,12 +85,15 @@ vm_pgmoveco(vm_map_t mapa, vm_object_t srcobj, vm_offset_t kaddr,
* First lookup the kernel page.
*/
kern_pg = PHYS_TO_VM_PAGE(vtophys(kaddr));
/*
* XXX The vm object containing kern_pg needs locking.
*/
if ((vm_map_lookup(&map, uaddr,
VM_PROT_WRITE, &entry, &uobject,
&upindex, &prot, &wired)) != KERN_SUCCESS) {
return(EFAULT);
}
VM_OBJECT_LOCK(uobject);
if ((user_pg = vm_page_lookup(uobject, upindex)) != NULL) {
do
vm_page_lock_queues();
@ -117,7 +120,7 @@ vm_pgmoveco(vm_map_t mapa, vm_object_t srcobj, vm_offset_t kaddr,
vm_page_flag_clear(kern_pg, PG_BUSY);
kern_pg->valid = VM_PAGE_BITS_ALL;
vm_page_unlock_queues();
VM_OBJECT_UNLOCK(uobject);
vm_map_lookup_done(map, entry);
return(KERN_SUCCESS);
}