linux.git/arch/mn10300/kernel/time.c, branch master

mn10300: Remove the architecture

2018-03-09T22:19:56+00:00

Remove the MN10300 arch as the hardware is defunct.

Suggested-by: Arnd Bergmann 
Signed-off-by: David Howells 
cc: Masahiro Yamada 
cc: linux-am33-list@redhat.com
Signed-off-by: Arnd Bergmann

sched/headers: Prepare for new header dependencies before moving code to

2017-03-02T07:42:27+00:00

We are going to split  out of , which
will have to be picked up from other headers and .c files.

Create a trivial placeholder  file that just
maps to  to make this patch obviously correct and
bisectable.

Include the new header in the files that are going to need it.

Acked-by: Linus Torvalds 
Cc: Mike Galbraith 
Cc: Peter Zijlstra 
Cc: Thomas Gleixner 
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar

MN10300: Use clockevents_calc_mult_shift()

2011-03-18T16:52:50+00:00

Use clockevents_calc_mult_shift() instead of the homebrewn function in
mn10300/kernel/time.c.

Signed-off-by: Thomas Gleixner 
Acked-by: John Stultz 
Cc: Koichi Yasutake 
Cc: Mark Salter 
Signed-off-by: David Howells

MN10300: Use clocksource_register_hz()

2011-03-18T16:52:50+00:00

clocksource_register_hz() calculates the shift/mult pair for the
clocksource. Remove the mn10300 duplicate implementation.

Signed-off-by: Thomas Gleixner 
Acked-by: John Stultz 
Cc: Koichi Yasutake 
Cc: Mark Salter 
Signed-off-by: David Howells

MN10300: Remove stale code

2011-03-18T16:52:49+00:00

mn10300 implements clocksource and clockevents and selects them
unconditionally in Kconfig. Remove the stale code which seems to be a
leftover of the conversion. Cleanup the configuration switches as well.

Signed-off-by: Thomas Gleixner 
Acked-by: John Stultz 
Cc: Koichi Yasutake 
Cc: Mark Salter 
Signed-off-by: David Howells

mn10300: Switch do_timer() to xtimer_update()

2011-02-09T15:17:24+00:00

Only one CPU gets the timer interrupt so mn10300_last_tsc does not
need to be protected by xtime lock. Remove xtime lovking and use
xtime_update() which does the locking itself.

Signed-off-by: Torben Hohn 
Cc: David Howells 
Cc: Koichi Yasutake 
LKML-Reference: <20110127150011.23248.62040.stgit@localhost>
Signed-off-by: Thomas Gleixner

clarify a usage constraint for cnt32_to_63()

2010-12-20T17:07:35+00:00

The cnt32_to_63 algorithm relies on proper counter data evaluation
ordering to work properly. This was missing from the provided
documentation.

Let's augment the documentation with the missing usage constraint and
fix the only instance that got it wrong.

Signed-off-by: Nicolas Pitre 
Acked-by: David Howells 
Signed-off-by: Linus Torvalds

MN10300: Generic time support

2010-10-27T16:28:57+00:00

Implement generic time support for MN10300.

Signed-off-by: Mark Salter 
Signed-off-by: David Howells

MN10300: And Panasonic AM34 subarch and implement SMP

2010-10-27T16:28:55+00:00

Implement the Panasonic MN10300 AM34 CPU subarch and implement SMP support for
MN10300.  Also implement support for the MN2WS0060 processor and the ASB2364
evaluation board which are AM34 based.

Signed-off-by: Akira Takeuchi 
Signed-off-by: Kiyoshi Owada 
Signed-off-by: David Howells

MN10300: Prevent cnt32_to_63() from being preempted in sched_clock()

2010-10-27T16:28:35+00:00

Prevent cnt32_to_63() from being preempted in sched_clock() because it may
read its internal counter, get preempted, get delayed for more than the half
period of the 'TSC' and then write the internal counter, thus corrupting it.

Whilst some callers of sched_clock() have interrupts disabled or hold
spinlocks, not all do, and so preemption must be held here.

Note that sched_clock() is called from lockdep, but that shouldn't be a problem
because although preempt_disable() calls into lockdep, lockdep has a recursion
counter to deal with this.

Signed-off-by: David Howells