Date: Mon, 14 Aug 2017 12:45:55 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-11@freebsd.org Subject: svn commit: r322498 - stable/11/sys/compat/linuxkpi/common/include/linux Message-ID: <201708141245.v7ECjtbD056207@repo.freebsd.org>
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Author: hselasky Date: Mon Aug 14 12:45:55 2017 New Revision: 322498 URL: https://svnweb.freebsd.org/changeset/base/322498 Log: MFC r314878: Add support for constant pointer constructs to READ_ONCE() in the LinuxKPI. When the type of the argument is constant the temporary variable cannot be assigned after the barrier. Instead assign the temporary variable by initialization. Sponsored by: Mellanox Technologies Modified: stable/11/sys/compat/linuxkpi/common/include/linux/compiler.h Directory Properties: stable/11/ (props changed) Modified: stable/11/sys/compat/linuxkpi/common/include/linux/compiler.h ============================================================================== --- stable/11/sys/compat/linuxkpi/common/include/linux/compiler.h Mon Aug 14 12:36:58 2017 (r322497) +++ stable/11/sys/compat/linuxkpi/common/include/linux/compiler.h Mon Aug 14 12:45:55 2017 (r322498) @@ -86,9 +86,10 @@ } while (0) #define READ_ONCE(x) ({ \ - __typeof(x) __var; \ - barrier(); \ - __var = ACCESS_ONCE(x); \ + __typeof(x) __var = ({ \ + barrier(); \ + ACCESS_ONCE(x); \ + }); \ barrier(); \ __var; \ })
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