When building the kernel there are lots of warnings like this:
drivers/net/wireless/ath/ath10k/ce.c:404:21: warning: unused variable ‘ar_pci’ [-Wunused-variable]
struct ath10k_pci *ar_pci = ath10k_pci_priv(ar);
They are caused by an empty lockdep_assert_held() which does nothing
with this variable in kernel version < 3.9. This patch replaces this
macro with the version from a recent kernel and silence this warning.
Signed-off-by: Hauke Mehrtens <hauke@xxxxxxxxxx>
---
backport/backport-include/linux/lockdep.h | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
create mode 100644 backport/backport-include/linux/lockdep.h
diff --git a/backport/backport-include/linux/lockdep.h b/backport/backport-include/linux/lockdep.h
new file mode 100644
index 0000000..3974b8d
--- /dev/null
+++ b/backport/backport-include/linux/lockdep.h
@@ -0,0 +1,17 @@
+#ifndef __BACKPORT_LINUX_LOCKDEP_H
+#define __BACKPORT_LINUX_LOCKDEP_H
+#include_next <linux/lockdep.h>
+#include <linux/version.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0)
+#undef lockdep_assert_held
+#ifdef CONFIG_LOCKDEP
+#define lockdep_assert_held(l) do { \
+ WARN_ON(debug_locks && !lockdep_is_held(l)); \
+ } while (0)
+#else
+#define lockdep_assert_held(l) do { (void)(l); } while (0)
+#endif /* CONFIG_LOCKDEP */
+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(3,9,0) */
+
+#endif /* __BACKPORT_LINUX_LOCKDEP_H */
--
2.1.4
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