Date: Mon, 29 Nov 2010 06:50:30 +0000 (UTC) From: Colin Percival <cperciva@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/i386/i386 machdep.c Message-ID: <201011290650.oAT6ohSN085776@repoman.freebsd.org>
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cperciva 2010-11-29 06:50:30 UTC
FreeBSD src repository
Modified files:
sys/i386/i386 machdep.c
Log:
SVN rev 216041 on 2010-11-29 06:50:30Z by cperciva
Fix bug introduced by r194784: Under XEN, the page(s) allocated to dpcpu
for CPU #0 weren't being properly reserved. Under VM pressure this would
cause problems when the dpcpu structures were overwritten by arbitrary
data; the most common symptom was a panic when netisr attempted to lock a
mutex.
For some reason the XEN code keeps track of the start of available memory
in the variables 'first', 'physfree', and 'init_first'; as far as I can
tell, we always have first == physfree == init_first * PAGE_SIZE. The
earlier commit adjusted 'first' (which, on !XEN, is the only variable
which tracks this value) but not the other two variables.
Exercise for reader: Eliminate two of these three variables.
Revision Changes Path
1.715 +2 -0 src/sys/i386/i386/machdep.c
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