Date: Sat, 31 Oct 2009 17:59:24 +0000 (UTC) From: Nathan Whitehorn <nwhitehorn@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/powerpc/aim copyinout.c Message-ID: <200910311759.n9VHxco2004160@repoman.freebsd.org>
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nwhitehorn 2009-10-31 17:59:24 UTC
FreeBSD src repository
Modified files:
sys/powerpc/aim copyinout.c
Log:
SVN rev 198724 on 2009-10-31 17:59:24Z by nwhitehorn
Fix a race in casuword() exposed by csup. casuword() non-atomically read
the current value of its argument before atomically replacing it, which
could occasionally return the wrong value on an SMP system. This resulted
in user mutex operations hanging when using threaded applications.
Revision Changes Path
1.17 +13 -2 src/sys/powerpc/aim/copyinout.c
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