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

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Message-ID: <20150702132103.GB30677@mtj.duckdns.org>
Date:	Thu, 2 Jul 2015 09:21:03 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Rusty Russell <rusty@...tcorp.com.au>
Cc:	Jens Axboe <axboe@...nel.dk>, Jon Christopherson <jon@...s.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] tools/perf, rbtree: Add RCU wrappers to make rbtree.h
 usable in user-space

(cc'ing Rusty and lkml)

Hello,

On Wed, Jul 01, 2015 at 10:18:48PM -0500, Jon Christopherson wrote:
> Hello guys,
> 
>     One last thing .. the recent commit : 02201e3f1 ("Merge tag
> 'modules-next-for-linus' of
> git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux") broke perf tools
> compilation. I know this isnt your area, but its a simple accidental
> omission of a file. Here is the needed change to correct retrieved from the
> list:
> 
> diff --git a/tools/perf/util/include/linux/rcupdate.h
> b/tools/perf/util/include/linux/rcupdate.h
> new file mode 100644
> index 0000000..51c0f45
> --- /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
> +

Rusty?

Thanks.

-- 
tejun
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