linux-kernel - Re: [PATCH 4/7] ARM: oprofile: Move non-ARM code into separate init/exit

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Message-ID: <20101006145311.GA3754@linux-sh.org>
Date:	Wed, 6 Oct 2010 23:53:11 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	Will Deacon <will.deacon@....com>,
	Russell King <linux@....linux.org.uk>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-sh@...r.kernel.org" <linux-sh@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Deng-Cheng Zhu <dengcheng.zhu@...il.com>,
	Grant Likely <grant.likely@...retlab.ca>
Subject: Re: [PATCH 4/7] ARM: oprofile: Move non-ARM code into separate init/exit

On Wed, Oct 06, 2010 at 04:49:21PM +0200, Robert Richter wrote:
> On 06.10.10 15:33:09, Robert Richter wrote:
> > On 04.10.10 16:44:22, Matt Fleming wrote:
> > > -void __exit oprofile_arch_exit(void)
> > > +int __init oprofile_arch_init(struct oprofile_operations *ops)
> > > +{
> > 
> > We should do here a:
> > 
> > 	memset(ops, 0, sizeof(*ops));
> 
> Matt,
> 
> an alternative would be to move this to oprofile_perf_init() and
> modify ops->backtrace afterwards, but then we will lose the function's
> tail call. Not sure that is better. Paul, what do you think?
> 
I'm a bit confused as to why we just don't do:

---

diff --git a/drivers/oprofile/oprof.c b/drivers/oprofile/oprof.c
index b336cd9..76d97a5 100644
--- a/drivers/oprofile/oprof.c
+++ b/drivers/oprofile/oprof.c
@@ -252,6 +252,8 @@ static int __init oprofile_init(void)
 {
 	int err;
 
+	memset(&oprofile_ops, 0, sizeof(struct oprofile_operations));
+
 	err = oprofile_arch_init(&oprofile_ops);
 	if (err < 0 || timer) {
 		printk(KERN_INFO "oprofile: using timer interrupt.\n");
--
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