K 10
svn:author
V 3
jhb
K 8
svn:date
V 27
2010-01-22T21:23:09.128268Z
K 7
svn:log
V 767
MFC 189698,192035:
Optimize the inner loop of pmap_copy().

Correct a rare use-after-free error in pmap_copy().  This error was
introduced in amd64 revision 1.540 and i386 revision 1.547.  However, it
had no harmful effects until after a recent change, r189698, on amd64.
(In other words, the error is harmless in RELENG_7.)

The error is triggered by the failure to allocate a pv entry for the one
and only mapping in a page table page.  I am addressing the error by
changing pmap_copy() to abort if either pv entry allocation or page
table page allocation fails.  This is appropriate because the creation of
mappings by pmap_copy() is optional.  They are a (possible) optimization,
and not a requirement.

Correct a nearby whitespace error in the i386 pmap_copy().

END