Re: Fix Blackfin HARDWARE_PM support

From: Robin Getz
Date: Tue Jan 15 2008 - 15:21:42 EST


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@xxxxxxxxxx>
> CC: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
> CC: Adrian Bunk <adrian.bunk@xxxxxxxxx>
> CC: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
> CC: bryan.wu@xxxxxxxxxx
> CC: Robin Getz <rgetz@xxxxxxxxxxxxxxxxxxxx>

Acked-by: Robin Getz <rgetz@xxxxxxxxxxxxxxxxxxxx>

> ---
> 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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