linux-kernel - Re: [PATCH v5 33/36] Hexagon: Add configuration and makefiles for the Hexagon architecture.

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Date:	Tue, 01 Nov 2011 19:59:52 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Richard Kuo <rkuo@...eaurora.org>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	linux-hexagon@...r.kernel.org
Subject: Re: [PATCH v5 33/36] Hexagon: Add configuration and makefiles for
 the Hexagon architecture.

On Tue, 2011-11-01 at 12:27 -0500, Richard Kuo wrote:
> On Tue, Nov 01, 2011 at 10:30:46AM +0100, Paul Bolle wrote:
> > Is GENERIC_PENDING_IRQ also a pending project?
> 
> Yes.

So, you'll move it up a line?

> > > +#config ZONE_DMA
> > > +#	bool
> > > +#	default y
> > 
> > Why is this added commented out?
> 
> We were using it before, but not anymore.

So, please drop it.

> > > +config STACKTRACE_SUPPORT
> > > +	def_bool y
> > > +	select STACKTRACE
> > 
> > Some grepping suggests that the tracing infrastructure will "select
> > STACKTRACE" if the architecture sets STACKTRACE_SUPPORT (tile apparently
> > also gets this wrong). Have I grepped this correctly?
> 
> Only if DEBUG_KMEMLEAK is selected apparently (?)

But "config TRACING" (in kernel/trace/Kconfig) also selects it if
STACKTRACE_SUPPORT is set. It seems GENERIC_TRACER is the hidden magic
here. GENERIC_TRACER is selected by the various tracer options - see
kernel/trace/Kconfig again, I'm unfamiliar with this stuff - and will
itself select TRACING. So if an arch has STACKTRACE_SUPPORT set it
doesn't have to select STACKTRACE itself. (Note that - except for tile -
no other arch selects STACKTRACE.) 

But hopefully someone who doesn't have to grep the Kconfig files to
understand this, can tell us for sure.

> We felt it was better to remove the platform code for this submission
> as it was not exactly clean and did not use the devtree code.  That's
> why it's commented out of the Makefiles.

If you really feel you need to add it, but commented out, perhaps a
comment can be added to keep people like me from submitting patches to
remove it.

Paul Bolle

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