linux-kernel - Re: [PATCH 4/5] hw-breakpoints: Arbitrate access to pmu following registers constraints

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Message-Id: <1252594635.7205.39.camel@laptop>
Date:	Thu, 10 Sep 2009 16:57:15 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Daniel Walker <dwalker@...o99.com>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	Jiri Slaby <jirislaby@...il.com>,
	Li Zefan <lizf@...fujitsu.com>, Avi Kivity <avi@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Mike Galbraith <efault@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [PATCH 4/5] hw-breakpoints: Arbitrate access to pmu following
 registers constraints

On Thu, 2009-09-10 at 07:41 -0700, Daniel Walker wrote:
> On Thu, 2009-09-10 at 10:29 +0200, Frederic Weisbecker wrote:
> 
> > +static unsigned int max_task_bp_pinned(int cpu)
> >  {
> > -	if (atomic_inc_return(&bp_slot) == HBP_NUM) {
> > -		atomic_dec(&bp_slot);
> > +	int i;
> > +	unsigned int *tsk_pinned = per_cpu(task_bp_pinned, cpu);
> >  
> > -		return -ENOSPC;
> > +	for (i = HBP_NUM -1; i >= 0; i--) {
> > +		if (tsk_pinned[i] > 0)
> > +			return i + 1;
> >  	}
> 
> One checkpatch error in the code above..
> 
> ERROR: need consistent spacing around '-' (ctx:WxV)
> #206: FILE: kernel/hw_breakpoint.c:81:
> +       for (i = HBP_NUM -1; i >= 0; i--) {
>                          ^

Don't you have anything useful to do?

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