linux-kernel - Re: [PATCH] Add PM_TRACE x86

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Message-ID: <20070213213547.GA5821@ucw.cz>
Date:	Tue, 13 Feb 2007 21:35:48 +0000
From:	Pavel Machek <pavel@....cz>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	Nigel Cunningham <nigel@...el.suspend2.net>,
	Otavio Salvador <otavio@...ian.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add PM_TRACE x86_64 support.

On Sat 2007-02-10 09:42:17, Jens Axboe wrote:
> On Fri, Feb 09 2007, Pavel Machek wrote:
> > Hi!
> > 
> > > > > Nigel Cunningham <nigel@...el.suspend2.net> writes:
> > > > > 
> > > > > > -	for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ; tracedata += 6) {
> > > > > > +	for (tracedata = &__tracedata_start ; tracedata < &__tracedata_end ; tracedata += 2 + sizeof(unsigned long)) {
> > > > > 
> > > > > Could you split this line?
> > > > 
> > > > Sure.
> > > > 
> > > > -- New version -- (What's the right way to do this?)
> > > > 
> > > > This patch add x86_64 support for PM_TRACE, and shifts per-arch code to
> > > > the appropriate subdirectories.
> > > > 
> > > > Symbol exports are added so tracing can be used from drivers built as
> > > > modules too.
> > > 
> > > Don't include exports in a patch that doesn't use them. Introduce the
> > > exports in a later patch series, for when you actually need it.
> > 
> > It is debugging infrastructure, so export actually makes sense... It
> > will not ever be used in mainline kernel; you need to modify code
> > manually to use this code..
> 
> Then add the exports while you are modifying the other code, it's no
> reason to put it in mainline.

Same could be said for the rest of the code, too... but Linus added it
to the mainline.

(Actually it has one example user somewhere, iirc)

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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