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Date: Wed, 17 Jun 2015 11:17:04 +0200 From: Ingo Molnar <mingo@...nel.org> To: Riku Voipio <riku.voipio@....fi>, Rusty Russell <rusty@...tcorp.com.au>, Stephen Rothwell <sfr@...b.auug.org.au> Cc: Peter Zijlstra <peterz@...radead.org>, mingo@...hat.com, acme@...nel.org, linux-kernel@...r.kernel.org, "Paul E. McKenney" <paulmck@...ibm.com> Subject: [PATCH] tools/perf, rbtree: Add RCU wrappers to make rbtree.h usable in user-space * Riku Voipio <riku.voipio@....fi> wrote: > Hi, > > The commit: > > commit d72da4a4d973d8a0a0d3c97e7cdebf287fbe3a99 > Author: Peter Zijlstra <peterz@...radead.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@...nel.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@....fi> Signed-off-by: Ingo Molnar <mingo@...nel.org> --- tools/perf/util/include/linux/rcupdate.h | 9 +++++++++ 1 file changed, 9 insertions(+) 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 + -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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