barrier_data() was added in Linux commit 7829fb09 "lib: make
memzero_explicit more robust against dead store elimination".
This is needed by memzero_explicit added in the next patch.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/compiler.h | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/backport/backport-include/linux/compiler.h b/backport/backport-include/linux/compiler.h
index 613b857..0b2358c 100644
--- a/backport/backport-include/linux/compiler.h
+++ b/backport/backport-include/linux/compiler.h
@@ -25,4 +25,12 @@
# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
#endif
+#ifndef barrier_data
+#ifdef __GNUC__
+#define barrier_data(ptr) __asm__ __volatile__("": :"r"(ptr) :"memory")
+#else /* __GNUC__ */
+# define barrier_data(ptr) barrier()
+#endif /* __GNUC__ */
+#endif
+
#endif /* __BACKPORT_LINUX_COMPILER_H */
--
2.8.1
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