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

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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);