Re: [PATCH] sched: move CONFIG_IRQ_TIME_ACCOUNTING to common code

From: Ingo Molnar
Date: Tue Feb 07 2012 - 03:29:13 EST

* Dmitry Antipov <dmitry.antipov@xxxxxxxxxx> wrote:

> Since CONFIG_IRQ_TIME_ACCOUNTING is architecture-agnostic,
> move it from x86 area to common code.
> Signed-off-by: Dmitry Antipov <dmitry.antipov@xxxxxxxxxx>
> ---
> arch/x86/Kconfig | 11 -----------
> lib/Kconfig.debug | 11 +++++++++++
> 2 files changed, 11 insertions(+), 11 deletions(-)

That's not enough, right now on x86 this code needs special
architecture glue, see how the noirqtime flag is used to call
into enable_sched_clock_irqtime() after TSC init.

So if you apply your patch and boot CONFIG_IRQ_TIME_ACCOUNTING=y
on say an ARM system, nothing will be done, because
sched_clock_irqtime is always zero.


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