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From: Ingo Molnar <mingo@kernel.org>
Date: Wed, 17 Jun 2015 11:17:04 +0200
Subject: [PATCH] tools/perf, rbtree: Add RCU wrappers to make rbtree.h usable
in user-space
* Riku Voipio <riku.voipio@iki.fi> wrote:
> Hi,
>
> The commit:
>
> commit d72da4a4d973d8a0a0d3c97e7cdebf287fbe3a99
> Author: Peter Zijlstra <peterz@infradead.org>
> Date: Wed May 27 11:09:36 2015 +0930
>
> rbtree: Make lockless searches non-fatal
>
> Adds <linux/rcupdate.h> to rbtree.h, which in turn is included from perf userspace
> headers. Now building tools/perf will fail with hundreds of lines of gcc complaining
> about kernel defines not available. Reverting the patch makes perf build again.
> This is with gcc-4.9 from debian but I don't think it's compiler specific.
Does the patch below make things work?
This fix could go into the modules tree, as this commit came via Rusty.
Stephen, feel free to add:
make -C tools/perf
to the linux-next build tests. It's always supposed to build without failure, in
pretty much whatever x86 distro you run your build tests on.
Thanks,
Ingo
===================>
From 62c251255f07ede8efa356d4ea9ab51827ffa0d0 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Wed, 17 Jun 2015 11:07:11 +0200
Subject: [PATCH] tools/perf, rbtree: Add RCU wrappers to make rbtree.h usable in user-space
Reported-by: Riku Voipio <riku.voipio@iki.fi>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
tools/perf/util/include/linux/rcupdate.h | 9 +++++++++
1 file changed, 9 insertions(+)
create mode 100644 tools/perf/util/include/linux/rcupdate.h
diff --git a/tools/perf/util/include/linux/rcupdate.h b/tools/perf/util/include/linux/rcupdate.h
new file mode 100644
index 000000000000..3e022dd9a69b
--- /dev/null
+++ b/tools/perf/util/include/linux/rcupdate.h
@@ -0,0 +1,9 @@
+#ifndef PERF_LINUX_RCUPDATE_H_
+#define PERF_LINUX_RCUPDATE_H_
+
+/* Simple trivial wrappers for now, we don't use RCU in perf user-space (yet): */
+#define WRITE_ONCE(var, val) ((var) = (val))
+#define rcu_assign_pointer(ptr, val) WRITE_ONCE(ptr, val)
+
+#endif
+
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