Date: Mon, 12 Oct 2009 16:11:25 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/amd64/include atomic.h src/sys/i386/include atomic.h Message-ID: <200910121611.n9CGBgQP043055@repoman.freebsd.org>
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attilio 2009-10-12 16:11:25 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
sys/amd64/include atomic.h
sys/i386/include atomic.h
Log:
SVN rev 197986 on 2009-10-12 16:11:25Z by attilio
MFC r197803, r197824, r197910:
Per their definition, atomic instructions used in conjuction with
memory barriers should also ensure that the compiler doesn't reorder paths
where they are used. GCC, however, does that aggressively, even in
presence of volatile operands. The most reliable way GCC offers for avoid
instructions reordering is clobbering "memory".
Not all our memory barriers, right now, clobber memory for GCC-like
compilers.
Fix these cases.
Revision Changes Path
1.44.2.2 +57 -41 src/sys/amd64/include/atomic.h
1.47.2.2 +57 -41 src/sys/i386/include/atomic.h
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