Author: kib
Date: Thu Jun 3 10:11:45 2010
New Revision: 208772
URL: http://svn.freebsd.org/changeset/base/208772
Log:
Add assertion and comment in vm_page_flag_set() describing the expectations
when the PG_WRITEABLE flag is set.
Reviewed by: alc
Modified:
head/sys/vm/vm_page.c
Modified: head/sys/vm/vm_page.c
==============================================================================
--- head/sys/vm/vm_page.c Thu Jun 3 09:54:53 2010 (r208771)
+++ head/sys/vm/vm_page.c Thu Jun 3 10:11:45 2010 (r208772)
@@ -486,6 +486,14 @@ vm_page_flag_set(vm_page_t m, unsigned s
{
mtx_assert(&vm_page_queue_mtx, MA_OWNED);
+ /*
+ * For a managed page, the PG_WRITEABLE flag can be set only if
+ * the page is VPO_BUSY. Currently this flag is only set by
+ * pmap_enter().
+ */
+ KASSERT((bits & PG_WRITEABLE) == 0 ||
+ (m->flags & (PG_UNMANAGED | PG_FICTITIOUS)) != 0 ||
+ (m->oflags & VPO_BUSY) != 0, ("PG_WRITEABLE and !VPO_BUSY"));
m->flags |= bits;
}
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