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A few assertions & comments.

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This commit is contained in:
uebayasi 2010-02-03 14:02:49 +00:00
parent 37e984601c
commit d0c590668f
1 changed files with 11 additions and 6 deletions
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17
sys/uvm/uvm_loan.c
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_loan.c,v 1.76 2010/02/02 17:40:43 uebayasi Exp $ */
/* $NetBSD: uvm_loan.c,v 1.77 2010/02/03 14:02:49 uebayasi Exp $ */
/*
*
@ -39,7 +39,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_loan.c,v 1.76 2010/02/02 17:40:43 uebayasi Exp $");
__KERNEL_RCSID(0, "$NetBSD: uvm_loan.c,v 1.77 2010/02/03 14:02:49 uebayasi Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -638,7 +638,10 @@ uvm_loanuobj(struct uvm_faultinfo *ufi, void ***output, int flags, vaddr_t va)
* XXXCDC: duplicate code with uvm_fault().
*/
/* locked: maps(read), amap(if there) */
mutex_enter(&uobj->vmobjlock);
/* locked: maps(read), amap(if there), uobj */
if (uobj->pgops->pgo_get) { /* try locked pgo_get */
npages = 1;
pg = NULL;
@ -1188,6 +1191,9 @@ uvm_loanbreak_anon(struct vm_anon *anon, struct uvm_object *uobj)
{
struct vm_page *pg;
KASSERT(mutex_owned(&anon->an_lock));
KASSERT(uobj == NULL || mutex_owned(&uobj->vmobjlock));
/* get new un-owned replacement page */
pg = uvm_pagealloc(NULL, 0, NULL, 0);
if (pg == NULL) {
@ -1195,8 +1201,7 @@ uvm_loanbreak_anon(struct vm_anon *anon, struct uvm_object *uobj)
}
/*
* copy data, kill loan, and drop uobj lock
* (if any)
* copy data, kill loan, and drop uobj lock (if any)
*/
/* copy old -> new */
uvm_pagecopy(anon->an_page, pg);
@ -1214,8 +1219,8 @@ uvm_loanbreak_anon(struct vm_anon *anon, struct uvm_object *uobj)
anon->an_page->loan_count--;
} else {
/*
* we were the lender (A->K); need
* to remove the page from pageq's.
* we were the lender (A->K); need to remove the page from
* pageq's.
*/
uvm_pagedequeue(anon->an_page);
}