[maint] batman-adv: Only provide (READ|WRITE)_ONCE when undefined
Commit Message
The Debian Jessie 3.16.x kernels (3.16.36-1 and later) modified the the
kernel sources to already provide the READ_ONCE and WRITE_ONCE kernel
macros. The batman-adv compat helper defines will conflict on such kernels
and thus prevent the compilation against these downstream kernels.
Reported-by: Ralf Jung <post@ralfj.de>
Signed-off-by: Sven Eckelmann <sven@narfation.org>
---
Cc: Ralf Jung <post+openmesh@ralfj.de>
See https://www.open-mesh.org/issues/350
---
compat-include/linux/compiler.h | 4 ++++
1 file changed, 4 insertions(+)
@@ -26,11 +26,15 @@
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 19, 0)
+#ifndef READ_ONCE
#define READ_ONCE(x) ACCESS_ONCE(x)
+#endif
+#ifndef WRITE_ONCE
#define WRITE_ONCE(x, val) ({ \
ACCESS_ONCE(x) = (val); \
})
+#endif
#endif /* < KERNEL_VERSION(3, 19, 0) */