linux-kernel - Re: [PATCH] clocksource/cadence_ttc: Reuse clocksource as sched

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4fab6223-45c5-453e-9972-1c12aa79a312@CO1EHSMHS008.ehs.local>
Date:	Fri, 5 Jul 2013 13:56:22 -0700
From:	Sören Brinkmann <soren.brinkmann@...inx.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	Baruch Siach <baruch@...s.co.il>,
	John Stultz <john.stultz@...aro.org>,
	LKML <linux-kernel@...r.kernel.org>,
	LAK <linux-arm-kernel@...ts.infradead.org>,
	Michal Simek <michal.simek@...inx.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH] clocksource/cadence_ttc: Reuse clocksource as sched_clock

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@...inx.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

	Sören


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/