Date: Wed, 27 Jul 2005 20:01:45 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, cvs-src@FreeBSD.org, cvs-all@FreeBSD.org Subject: cvs commit: src/sys/arm/include atomic.h src/sys/sparc64/include cpufunc.h Message-ID: <200507272001.j6RK1jjA072124@repoman.freebsd.org>
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jhb 2005-07-27 20:01:45 UTC
FreeBSD src repository
Modified files:
sys/arm/include atomic.h
sys/sparc64/include cpufunc.h
Log:
Add extra constraints to tell the compiler that the memory be modified
in the arm __swp() and sparc64 casa() and casax() functions is actually
being used as an input and output and not just the value of the register
that points to the memory location. This was the underlying source of
the mbuf refcount problems on sparc64 a while back. For arm this should be
a nop because __swp() has a constraint to clobber all memory which can
probably be removed now.
Reviewed by: alc, cognet
MFC after: 1 week
Revision Changes Path
1.10 +4 -2 src/sys/arm/include/atomic.h
1.21 +6 -4 src/sys/sparc64/include/cpufunc.h
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