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

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Date:	Thu, 10 Sep 2009 20:09:56 +1000
From:	Paul Mackerras <paulus@...ba.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Ingo Molnar <mingo@...e.hu>, 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

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?

Paul.
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