K 10
svn:author
V 2
ps
K 8
svn:date
V 27
2004-11-16T19:48:09.000000Z
K 7
svn:log
V 918
MFC:
>alc         2004/05/21 21:53:52 PDT
>
>  FreeBSD src repository
>
>  Modified files:
>    sys/vm               vm_extern.h vm_fault.c vm_map.c vm_page.c
>  Log:
>    To date, unwiring a fictitious page has produced a panic.  The reason
>    being that PHYS_TO_VM_PAGE() returns the wrong vm_page for fictitious
>    pages but unwiring uses PHYS_TO_VM_PAGE().  The resulting panic
>    reported an unexpected wired count.  Rather than attempting to fix
>    PHYS_TO_VM_PAGE(), this fix takes advantage of the properties of
>    fictitious pages.  Specifically, fictitious pages will never be
>    completely unwired.  Therefore, we can keep a fictitious page's wired
>    count forever set to one and thereby avoid the use of
>    PHYS_TO_VM_PAGE() when we know that we're working with a fictitious
>    page, just not which one.
>
>    In collaboration with: green@, tegge@
>    PR: kern/29915

Reviewed by:	alc

END