linux-kernel - Re: [RFC patch 08/18] cnt32_to_63 should use smp

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Date:	Fri, 7 Nov 2008 13:42:51 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Harvey Harrison <harvey.harrison@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>, dhowells@...hat.com,
	nico@....org, torvalds@...ux-foundation.org, mingo@...e.hu,
	a.p.zijlstra@...llo.nl, linux-kernel@...r.kernel.org,
	ralf@...ux-mips.org, benh@...nel.crashing.org, paulus@...ba.org,
	davem@...emloft.net, mingo@...hat.com, tglx@...utronix.de,
	rostedt@...dmis.org, linux-arch@...r.kernel.org
Subject: Re: [RFC patch 08/18] cnt32_to_63 should use smp_rmb()

* Harvey Harrison (harvey.harrison@...il.com) wrote:
> On Fri, 2008-11-07 at 10:21 -0800, Andrew Morton wrote:
> > On Fri, 7 Nov 2008 13:00:41 -0500
> > Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> > > > It's one of those things I hope I never need to know about, but perhaps
> > > > we do somewhere have static storage in an inline.  Wouldn't surprise
> > > > me, and I bet that if we do, it's a bug.
> > > 
> > > Tracepoints actually use that.
> > 
> > Referring to include/linux/tracepoint.h:DEFINE_TRACE()?
> > 
> > It does look a bit fragile.  Does every .c file which included
> > include/trace/block.h get a copy of __tracepoint_block_rq_issue,
> > whether or not it used that tracepoint? Hopefully not.
> > 
> > > It could be changed so they use :
> > > 
> > > DECLARE_TRACE() (in include/trace/group.h)
> > > DEFINE_TRACE()  (in the appropriate kernel c file)
> > > trace_somename(); (in the code)
> > > 
> > > instead. That would actually make more sense and remove the need for
> > > multiple declarations when the same tracepoint name is used in many
> > > spots (this is a problem kmemtrace has, it generates a lot of tracepoint
> > > declarations).
> 
> Could this scheme also help with the thousands of sparse warnings that
> kmemtrace produces because of the current arrangement, all of the form:
> 
> include/linux/kmemtrace.h:33:2: warning: Initializer entry defined twice
> include/linux/kmemtrace.h:33:2:   also defined here
> 
> As you could have unique names for the tracepoints now, rather than the
> 'unique' static storage?  Or am I off-base here?
> 

Exactly.

Mathieu

> Harvey
> 
> 
> 

-- 
Mathieu Desnoyers
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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