linux-kernel - Re: [2.6.24 patch] Fix blackfin HARDWARE

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Date:	Wed, 2 Jan 2008 12:46:58 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Robin Getz <rgetz@...ckfin.uclinux.org>
Cc:	Adrian Bunk <bunk@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Randy Dunlap <randy.dunlap@...cle.com>, bryan.wu@...log.com,
	linux-kernel@...r.kernel.org
Subject: Re: [2.6.24 patch] Fix blackfin HARDWARE_PM support

* Mathieu Desnoyers (mathieu.desnoyers@...ymtl.ca) wrote:
> (Robin, can you check if this patch does what is currently intended with
> HARDWARE_PM please ? This involves testing with CONFIG_OPROFILE y/m/n.)
> 
> This patch restores the blackfin Hardware Performance Monitor Profiling
> support that was killed by
> commit 09cadedbdc01f1a4bea1f427d4fb4642eaa19da9.
> 
> Since there seems to be no good reason to behave differently from other
> architectures, it now automatically selects the hardware performance counters
> whenever the profiling is activated.
> 
> mach-common/irqpanic.c: pm_overflow
> calls pm_overflow_handler which is in oprofile/op_model_bf533.c. I doubt that
> setting HARDWARE_PM as "m" will work at all, since the pm_overflow_handler
> should be in the core kernel image because it is called by irqpanic.c.
> 
> Therefore, I change HARDWARE_PM from a tristate to a bool.
> 
> The whole arch/$(ARCH)/oprofile/ is built depending on CONFIG_OPROFILE. Since
> part of the HARDWARE_PM support files sits in this directory, it makes sense to
> also depend on OPROFILE, not only PROFILING. Since OPROFILE already depends on
> PROFILING, it is correct to only depend on OPROFILE only.
> 


This patch header should also include :

Problem identified by Adrian Bunk. Patch inspired by the original fix
proposed by him.

Thanks,

Mathieu


> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> CC: Adrian Bunk <adrian.bunk@...ial.fi>
> CC: Randy Dunlap <randy.dunlap@...cle.com>
> CC: bryan.wu@...log.com
> CC: Robin Getz <rgetz@...ckfin.uclinux.org>
> ---
>  arch/blackfin/Kconfig |    4 ++++
>  1 file changed, 4 insertions(+)
> 
> Index: linux-2.6-lttng/arch/blackfin/Kconfig
> ===================================================================
> --- linux-2.6-lttng.orig/arch/blackfin/Kconfig	2007-12-29 11:00:05.000000000 -0500
> +++ linux-2.6-lttng/arch/blackfin/Kconfig	2007-12-29 11:25:39.000000000 -0500
> @@ -65,6 +65,10 @@ config GENERIC_CALIBRATE_DELAY
>  	bool
>  	default y
>  
> +config HARDWARE_PM
> +	def_bool y
> +	depends on OPROFILE
> +
>  source "init/Kconfig"
>  source "kernel/Kconfig.preempt"
>  
> 
> -- 
> 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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-- 
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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