linux-kernel - Re: Fix Blackfin HARDWARE

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Date:	Tue, 15 Jan 2008 15:22:38 -0500
From:	Robin Getz <rgetz@...ckfin.uclinux.org>
To:	"Mathieu Desnoyers" <mathieu.desnoyers@...ymtl.ca>
Cc:	"Linus Torvalds" <torvalds@...ux-foundation.org>,
	"Adrian Bunk" <adrian.bunk@...ial.fi>,
	"Randy Dunlap" <randy.dunlap@...cle.com>, bryan.wu@...log.com,
	linux-kernel@...r.kernel.org
Subject: Re: Fix Blackfin HARDWARE_PM support

On Tue 15 Jan 2008 12:42, Mathieu Desnoyers pondered:
> 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.
> 
> Thanks to Adrian Bunk for finding this bug and providing an initial
> patch.
> 
> Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
> CC: Linus Torvalds <torvalds@...ux-foundation.org>
> 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>

Acked-by: 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"
>  
> 
> 
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