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

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Date:	Tue, 15 Jan 2008 09:05:16 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Adrian Bunk <adrian.bunk@...ial.fi>
Cc:	Russell King <rmk+lkml@....linux.org.uk>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	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,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: Re: Fwd: Re: [2.6.24 patch] restore ARMv6 OProfile support

* Adrian Bunk (adrian.bunk@...ial.fi) wrote:
> On Tue, Jan 15, 2008 at 10:45:26AM +0000, Russell King wrote:
> > I never got a response on my message, but I have just receieved:
> > 
> > | Date: Tue, 15 Jan 2008 11:05:00 +0100
> > | From: Joerg Wagner <wagner@...neclab.eu>
> > | To: ARM Linux Mailing List <linux-arm-kernel@...ts.arm.linux.org.uk>
> > | Subject: 2.6.24-rc7 : oprofile on MPCore broken
> > | 
> > | Hello,
> > | 
> > | just tried to use oprofile on 2.6.24-rc7.
> > | It does not detect the right processor
> > |  (/dev/oprofile/cpu_type contains "timer").
> > | 
> > | As I don't know exactly, how the string
> > | "arm/mpcore" from arch/arm/oprofile/op_model_mpcore.c
> > | gets feeded into that file, maybe someone else can help ?
> > 
> > So people are hitting the resulting mess created by 09cadedbdc01f1a4bea1f427d4fb4642eaa19da9.
> > Can we please fix this regression one way or another please?
> > 
> > I don't particularly like stuffing the options into some random place
> > in the architectures Kconfig file when they should stay along side the
> > instrumentation configuration entries.
> 
> Below is the patch I already sent on 28 Dec 2007 that stuffs it into 
> Kconfig.instrumentation.
> 
> Technically it shouldn't make any difference whether this patch or
> Mathieu's patch that stuffs it into arch/arm/Kconfig gets applied, but 
> one of them should be applied for 2.6.24 (plus either mine or Mathieu's 
> fix for the blackfin HARDWARE_PM support broken by the same commit).
> 
> I found the bugs in Mathieu's commit 09cadedbdc01f1a4bea1f427d4fb4642eaa19da9,
> I wrote patches that restore the status quo, Cc'ed all people even
> remotely related to this issue, and I opened the Bugzilla bugs required
> for getting them on the regression lists. Mathieu wants the regressions
> he introduced fixed different from what my patches did and that's not a
> problem for me (his patches are also OK).
> 
> What went wrong that his regression fixes did not land in Linus' tree?
> 

Yes Adrian, and I thank you very much for all this work. I only
suggested the alternative patches so it would remove menu options nobody
really needs (historical special-cases) and make it easier to apply the
following set of patches already in -mm.

One way or another, either your or my arm and blackfin patches should
get into 2.6.24 final.

Mathieu

> cu
> Adrian
> 
> 
> <--  snip  -->
> 
> 
> This patch restores the ARMv6 OProfile support that was killed by
> commit 09cadedbdc01f1a4bea1f427d4fb4642eaa19da9.
> 
> Signed-off-by: Adrian Bunk <adrian.bunk@...ial.fi>
> 
> ---
> 
>  kernel/Kconfig.instrumentation |   19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
> 
> 7fc221ef169610b5eac98e2ddd641811c0d53e4a 
> diff --git a/kernel/Kconfig.instrumentation b/kernel/Kconfig.instrumentation
> index 468f47a..4453187 100644
> --- a/kernel/Kconfig.instrumentation
> +++ b/kernel/Kconfig.instrumentation
> @@ -29,2 +29,17 @@ config OPROFILE
> 
> +config OPROFILE_ARMV6
> +	bool
> +	depends on OPROFILE && ARM && CPU_V6 && !SMP
> +	default y
> +	select OPROFILE_ARM11_CORE
> +
> +config OPROFILE_MPCORE
> +	bool
> +	depends on OPROFILE && ARM && CPU_V6 && SMP
> +	default y
> +	select OPROFILE_ARM11_CORE
> +
> +config OPROFILE_ARM11_CORE
> +	bool
> +
>  config KPROBES

-- 
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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