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Subject: Re: [PATCH v5 3.1.0-rc4-tip 18/26]   uprobes: slot allocation.
From: Peter Zijlstra <peterz@infradead.org>
Date: Tue, 27 Sep 2011 14:36:08 +0200
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	 <20110920120335.25326.50673.sendpatchset@srdronam.in.ibm.com>
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To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Jonathan Corbet <corbet@lwn.net>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Thomas Gleixner <tglx@linutronix.de>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, Oleg Nesterov <oleg@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Andi Kleen <andi@firstfloor.org>, LKML <linux-kernel@vger.kernel.org>

On Tue, 2011-09-20 at 17:33 +0530, Srikar Dronamraju wrote:
> +static void xol_wait_event(struct uprobes_xol_area *area)
> +{
> +       if (atomic_read(&area->slot_count) >=3D UINSNS_PER_PAGE)
> +               wait_event(area->wq,
> +                       (atomic_read(&area->slot_count) < UINSNS_PER_PAGE=
));
> +}=20

That's mighty redundant, look up wait_event() and try again.

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