linux-kernel - Re: [PATCH] tools/perf, rbtree: Add RCU wrappers to make rbtree.h usable in user-space

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Message-ID: <0c263691-711a-4951-a87d-4d3ec52be2e8@iki.fi>
Date:	Wed, 17 Jun 2015 12:33:51 +0300
From:	Riku Voipio <riku.voipio@....fi>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Rusty Russell <rusty@...tcorp.com.au>,
	Stephen Rothwell <sfr@...b.auug.org.au>,
	Peter Zijlstra <peterz@...radead.org>, <mingo@...hat.com>,
	<acme@...nel.org>, <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ibm.com>
Subject: Re: [PATCH] tools/perf, rbtree: Add RCU wrappers to make rbtree.h usable in user-space

On Wednesday, June 17, 2015 12:17:04 PM EEST, Ingo Molnar wrote:
> * 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 ...
>
> Does the patch below make things work?

It does,

Tested-by: Riku Voipio <riku.voipio@....fi>

> 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
> +
>
>

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