linux-kernel - Re: Fix Blackfin HARDWARE

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Date:	Wed, 16 Jan 2008 10:25:50 +0800
From:	"Bryan Wu" <cooloney.lkml@...il.com>
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,
	"Robin Getz" <rgetz@...ckfin.uclinux.org>,
	linux-kernel@...r.kernel.org
Subject: Re: Fix Blackfin HARDWARE_PM support

On Jan 16, 2008 1:42 AM, Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:
> 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>
> ---

Thanks, finally we got this.

Acked-by: Bryan Wu <bryan.wu@...log.com>

>  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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