linux-kernel - Re: Fwd: Re: [2.6.24 patch] restore ARMv6 OProfile support

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Message-ID: <20080115195057.GA14152@Krystal>
Date:	Tue, 15 Jan 2008 14:50:57 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Russell King <rmk+lkml@....linux.org.uk>,
	Adrian Bunk <adrian.bunk@...ial.fi>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>, phil.el@...adoo.fr,
	oprofile-list@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: Re: Fwd: Re: [2.6.24 patch] restore ARMv6 OProfile support

* Sam Ravnborg (sam@...nborg.org) wrote:
> On Tue, Jan 15, 2008 at 02:07:20PM -0500, Mathieu Desnoyers wrote:
> > * Linus Torvalds (torvalds@...ux-foundation.org) wrote:
> > > 
> > > 
> > > On Tue, 15 Jan 2008, Mathieu Desnoyers wrote:
> > > > 
> > > > Well, it goes along the lines of the patch I suggested as a reply to
> > > > Adrian, with these differences :
> > > > 
> > > > - I still source the kernel/Kconfig.instrumentation file.
> > > > - I put back the missing OPROFILE options directly in arch/arm/Kconfig
> > > > 
> > > > Then end result is the same as your patch, but without the code
> > > > duplication.
> > > 
> > > No it's not.
> > > 
> > > Now the config variables may all be there, but the UI for the *menu* 
> > > system is broken (ie all the ARM profiling config options are now outside 
> > > the profiling menu).
> > > 
> > > Is that menu really needed? I dunno. But since it exists, it should be 
> > > correct.
> > > 
> > > 		Linus
> > 
> > There is an "instrumentation menu removal" patchset I've submitted to
> > Andrew for the next release cycle that moves the instrumentation menu
> > content into General setup (I did this following your advice).
> > 
> > Furthermore, on ARM, the OPROFILE_ARMV6, OPROFILE_MPCORE and
> > OPROFILE_ARM11_CORE are all "bool , default y" (equivalent to the
> > preferred def_bool y). Unless I am grossly mistaken, this is not
> > supposed to show up in the menus; it's just selected when the
> > dependencies are met.
> 
> This was the patch:
> +if OPROFILE
> +
> +config OPROFILE_ARMV6
> +	def_bool y
> +	depends on CPU_V6 && !SMP
> +	select OPROFILE_ARM11_CORE
> +
> +config OPROFILE_MPCORE
> +	def_bool y
> +	depends on CPU_V6 && SMP
> +	select OPROFILE_ARM11_CORE
> +
> +config OPROFILE_ARM11_CORE
> +	bool
> +
> +endif
> 
> And none of these has a prompt defined so they do not show up
> as a menu.
> It is very easy to test if you have the patch applied.
> No cross toolchin is needed - just do:
> make ARCH=arm menuconfig
> 
> 	Sam

Just tested with and without oprofile/MPCORE/CPU_V6 combinations and I
confirm that :

- no menu is showing up (as expected)
- the OPROFILE_* config options are selected (or not) as expected

Mathieu

-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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