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two changes to pmap_enter():

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- allow entry of the same mapping that's already there.
   this can happen with UBC.
 - if PMAP_CANFAIL, return failure rather than sleeping
   when we fail to allocate a ptp.
This commit is contained in:
chs 2000-11-21 06:14:40 +00:00
parent 2116915a30
commit 197f7aae9c
1 changed files with 9 additions and 6 deletions
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15
sys/arch/vax/vax/pmap.c
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@ -1,4 +1,4 @@
/* $NetBSD: pmap.c,v 1.90 2000/11/21 05:49:08 chs Exp $ */
/* $NetBSD: pmap.c,v 1.91 2000/11/21 06:14:40 chs Exp $ */
/*
* Copyright (c) 1994, 1998, 1999 Ludd, University of Lule}, Sweden.
* All rights reserved.
@ -720,6 +720,8 @@ if (startpmapdebug)
pg = uvm_pagealloc(NULL, 0, NULL, 0);
if (pg != NULL)
break;
if (flags & PMAP_CANFAIL)
return (KERN_RESOURCE_SHORTAGE);
if (pmap == pmap_kernel())
panic("pmap_enter: no free pages");
@ -745,11 +747,12 @@ if (startpmapdebug)
RECURSEEND;
return (KERN_SUCCESS);
}
#ifdef DIAGNOSTIC
/* No mapping change. Not allowed to happen. */
if (newpte == oldpte)
panic("pmap_enter onto myself");
#endif
/* mapping unchanged? just return. */
if (newpte == oldpte) {
RECURSEEND;
return (KERN_SUCCESS);
}
/* Changing mapping? */
oldpte &= PG_FRAME;