Date: Wed, 3 Jul 2013 17:47:49 +0000 (UTC) From: Attilio Rao <attilio@FreeBSD.org> To: src-committers@freebsd.org, svn-src-user@freebsd.org Subject: svn commit: r252579 - user/attilio/vmobj-readlock/sys/vm Message-ID: <201307031747.r63Hln3H054848@svn.freebsd.org>
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Author: attilio Date: Wed Jul 3 17:47:48 2013 New Revision: 252579 URL: http://svnweb.freebsd.org/changeset/base/252579 Log: Mark the busy_lock as volatile in order to avoid compiler optimizations which can result in problems with inlined functions, like vm_page_busy_wlocked(). Sponsored by: EMC / Isilon storage division Modified: user/attilio/vmobj-readlock/sys/vm/vm_page.h Modified: user/attilio/vmobj-readlock/sys/vm/vm_page.h ============================================================================== --- user/attilio/vmobj-readlock/sys/vm/vm_page.h Wed Jul 3 17:39:19 2013 (r252578) +++ user/attilio/vmobj-readlock/sys/vm/vm_page.h Wed Jul 3 17:47:48 2013 (r252579) @@ -159,7 +159,7 @@ struct vm_page { /* so, on normal X86 kernels, they must be at least 8 bits wide */ vm_page_bits_t valid; /* map of valid DEV_BSIZE chunks (O) */ vm_page_bits_t dirty; /* map of dirty DEV_BSIZE chunks (M) */ - u_int busy_lock; /* busy owners lock */ + volatile u_int busy_lock; /* busy owners lock */ }; /*
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