Date: Tue, 7 Mar 2017 20:24:34 +0000 (UTC) From: Hans Petter Selasky <hselasky@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r314878 - head/sys/compat/linuxkpi/common/include/linux Message-ID: <201703072024.v27KOYWN042208@repo.freebsd.org>
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Author: hselasky Date: Tue Mar 7 20:24:34 2017 New Revision: 314878 URL: https://svnweb.freebsd.org/changeset/base/314878 Log: 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. MFC after: 1 week Sponsored by: Mellanox Technologies Modified: head/sys/compat/linuxkpi/common/include/linux/compiler.h Modified: head/sys/compat/linuxkpi/common/include/linux/compiler.h ============================================================================== --- head/sys/compat/linuxkpi/common/include/linux/compiler.h Tue Mar 7 19:30:22 2017 (r314877) +++ head/sys/compat/linuxkpi/common/include/linux/compiler.h Tue Mar 7 20:24:34 2017 (r314878) @@ -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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