linux-kernel - Re: [RFC GIT PULL] hw-breakpoints: Rewrite on top of perf counters

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Date:	Thu, 10 Sep 2009 19:23:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Prasad <prasad@...ux.vnet.ibm.com>,
	Alan Stern <stern@...land.harvard.edu>,
	Peter Zijlstra <peterz@...radead.org>,
	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>,
	Mike Galbraith <efault@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>
Subject: Re: [RFC GIT PULL] hw-breakpoints: Rewrite on top of perf counters


* Paul Mackerras <paulus@...ba.org> wrote:

> Frederic Weisbecker writes:
> 
> > This is a rewrite of the hardware breakpoints on top of perf counters.
> 
> On powerpc, it doesn't build.  I get:
> 
>   CC      kernel/perf_counter.o
> kernel/perf_counter.c:31:31: error: asm/hw_breakpoint.h: No such file or directory
> kernel/perf_counter.c: In function 'bp_perf_counter_init':
> kernel/perf_counter.c:3964: error: implicit declaration of function 'register_perf_hw_breakpoint'
> kernel/perf_counter.c:3966: error: implicit declaration of function '__register_perf_hw_breakpoint'
> kernel/perf_counter.c:3968: error: 'perf_ops_bp' undeclared (first use in this function)
> kernel/perf_counter.c:3968: error: (Each undeclared identifier is reported only once
> kernel/perf_counter.c:3968: error: for each function it appears in.)
> make[2]: *** [kernel/perf_counter.o] Error 1
> make[1]: *** [kernel] Error 2
> make: *** [sub-make] Error 2
> 
> Seems like every architecture now needs an asm/hw_breakpoint.h.  
> What is the minimum required in that file?  Looks like we would 
> require a perf_ops_bp, at least.
> 
> Could you please either arrange things so that architectures that 
> don't have hardware breakpoints hooked up to perf_counters don't 
> need an asm/hw_breakpoint.h, or add minimal versions of that file 
> for every architecture, so as not to break bisection 
> unnecessarily?

I'd prefer the former - i.e. dont touch architectures that dont 
support it yet.

	Ingo
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