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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