[PATCH] clocksource/cadence_ttc: Reuse clocksource as sched_clock

[Sören Brinkmann]

On Fri, Jul 05, 2013 at 10:42:03PM +0200, Thomas Gleixner wrote:
> On Fri, 5 Jul 2013, Sören Brinkmann wrote:
> > On Thu, Jul 04, 2013 at 06:30:26AM +0300, Baruch Siach wrote:
> > > Hi Soren,
> > > 
> > > On Wed, Jul 03, 2013 at 02:50:16PM -0700, Soren Brinkmann wrote:
> > > > Reuse the TTC clocksource timer as sched clock, too. Since only a single
> > > > sched clock is supported in Linux, this feature optional and can be
> > > > selected through Kconfig.
> > > > 
> > > > Signed-off-by: Soren Brinkmann <soren.brinkmann at xilinx.com>
> > > > ---
> > > 
> > > [...]
> > > 
> > > > diff --git a/drivers/clocksource/cadence_ttc_timer.c 
> > > > b/drivers/clocksource/cadence_ttc_timer.c
> > > > index 4cbe28c..ef0f52b 100644
> > > > --- a/drivers/clocksource/cadence_ttc_timer.c
> > > > +++ b/drivers/clocksource/cadence_ttc_timer.c
> > > > @@ -22,6 +22,7 @@
> > > >  #include <linux/of_irq.h>
> > > >  #include <linux/slab.h>
> > > >  #include <linux/clk-provider.h>
> > > > +#include <asm/sched_clock.h>
> > > 
> > > This has changed to linux/sched_clock.h in the tip tree. See 
> > > https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?h=timers/core&id=38ff87f77af0b5a93fc8581cff1d6e5692ab8970.
> > Is that change going into Linus' tree during the 3.11 merge window? The
> > tip tree is missing some changes to the TTC which went in through the
> > armsoc tree.
> 
> Yes, this is about to be sent Linuswards. Can we please coordinate
> that stuff. drivers/clocksource depend on tip timers/* branches and
> any modification in some other tree is going to be doomed.
> 
> We have a mechanism for that in place, if stuff goes cross trees. One
> of the trees provides a set of commit for the other tree to pull, so
> we do not end up with merge dependencies and conflicts.
> 
> Why is clocksource stuff going through armsoc unless it contains
> related modifications in arch/arm/
We overhauled Zynq's common clock code and migrated all Zynq drivers to
it - the TTC being one. I'm pretty sure you were on the CC list for that
change.
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=30e1e28598c2674c133148d8aec6d431d7acd314

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