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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