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In amap_ref, only increment the amap's refcnt after we have established 

the ppref array.  Otherwise, the newly ref'ed pages will be doubly
counted and thus never freed because the pprefcnt can't fall to 0.
This commit is contained in:
matt 2002-08-22 23:39:37 +00:00
parent e85eb3093d
commit 78581fe411
1 changed files with 4 additions and 2 deletions
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6
sys/uvm/uvm_amap_i.h
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@ -1,4 +1,4 @@
/* $NetBSD: uvm_amap_i.h,v 1.17 2001/05/25 04:06:11 chs Exp $ */
/* $NetBSD: uvm_amap_i.h,v 1.18 2002/08/22 23:39:37 matt Exp $ */
/*
*
@ -206,13 +206,15 @@ amap_ref(amap, offset, len, flags)
UVMHIST_FUNC("amap_ref"); UVMHIST_CALLED(maphist);
amap_lock(amap);
amap->am_ref++;
if (flags & AMAP_SHARED)
amap->am_flags |= AMAP_SHARED;
#ifdef UVM_AMAP_PPREF
if (amap->am_ppref == NULL && (flags & AMAP_REFALL) == 0 &&
len != amap->am_nslot)
amap_pp_establish(amap);
#endif
amap->am_ref++;
#ifdef UVM_AMAP_PPREF
if (amap->am_ppref && amap->am_ppref != PPREF_NONE) {
if (flags & AMAP_REFALL)
amap_pp_adjref(amap, 0, amap->am_nslot, 1);