linux-toradex.git/arch/m32r/kernel/time.c, branch v3.11

time: convert arch_gettimeoffset to a pointer

2012-12-24T16:36:07+00:00

Currently, whenever CONFIG_ARCH_USES_GETTIMEOFFSET is enabled, each
arch core provides a single implementation of arch_gettimeoffset(). In
many cases, different sub-architectures, different machines, or
different timer providers exist, and so the arch ends up implementing
arch_gettimeoffset() as a call-through-pointer anyway. Examples are
ARM, Cris, M68K, and it's arguable that the remaining architectures,
M32R and Blackfin, should be doing this anyway.

Modify arch_gettimeoffset so that it itself is a function pointer, which
the arch initializes. This will allow later changes to move the
initialization of this function into individual machine support or timer
drivers. This is particularly useful for code in drivers/clocksource
which should rely on an arch-independant mechanism to register their
implementation of arch_gettimeoffset().

This patch also converts the Cris architecture to set arch_gettimeoffset
directly to the final implementation in time_init(), because Cris already
had separate time_init() functions per sub-architecture. M68K and ARM
are converted to set arch_gettimeoffset to the final implementation in
later patches, because they already have function pointers in place for
this purpose.

Cc: Russell King 
Cc: Mike Frysinger 
Cc: Mikael Starvik 
Cc: Hirokazu Takata 
Cc: Thomas Gleixner 
Acked-by: Geert Uytterhoeven 
Acked-by: Jesper Nilsson 
Acked-by: John Stultz 
Signed-off-by: Stephen Warren

m32r: Switch from do_timer() to xtime_update()

2011-01-31T13:55:45+00:00

xtime_update() does proper locking.

Signed-off-by: Torben Hohn 
Cc: Peter Zijlstra 
Cc: johnstul@us.ibm.com
Cc: Hirokazu Takata 
Cc: hch@infradead.org
Cc: yong.zhang0@gmail.com
LKML-Reference: <20110127150001.23248.68620.stgit@localhost>
Signed-off-by: Thomas Gleixner

m32r: Convert m32r to use read/update_peristent_clock

2010-03-13T00:14:12+00:00

This patch converts the m32r architecture to use the generic
read_persistent_clock and update_persistent_clock interfaces, reducing
the amount of arch specific code we have to maintain, and allowing for
further cleanups in the future.

I have not built or tested this patch, so help from arch maintainers
would be appreciated.

Signed-off-by: John Stultz 
Cc: Hirokazu Takata 
Cc: Andrew Morton 
LKML-Reference: <1267675049-12337-11-git-send-email-johnstul@us.ibm.com>
Signed-off-by: Thomas Gleixner

arch/m32r: Use DIV_ROUND_CLOSEST

2009-11-03T23:31:50+00:00

The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d
but is perhaps more readable.

The semantic patch that makes this change is as follows:
(http://www.emn.fr/x-info/coccinelle/)

// 
@haskernel@
@@

@depends on haskernel@
expression x,__divisor;
@@

- (((x) + ((__divisor) / 2)) / (__divisor))
+ DIV_ROUND_CLOSEST(x,__divisor)
// 

Signed-off-by: Julia Lawall 
Signed-off-by: Hirokazu Takata

m32r: add rtc_lock variable

2009-10-04T03:02:36+00:00

Add a spinlock variable "rtc_lock".
This is taken from arch/arm/kernel/time.c.

Signed-off-by: Hirokazu Takata

m32r: convert to use arch_gettimeoffset()

2009-09-22T14:17:43+00:00

Convert m32r to use GENERIC_TIME via the arch_getoffset() infrastructure,
reducing the amount of arch specific code we need to maintain.

I also noted that m32r doesn't seem to be taking the xtime write lock
before calling do_timer()!  That looks like a pretty bad bug to me.  If
folks agree, let me know and I can move the lock grab to the correct spot.

Signed-off-by: John Stultz 
Cc: Hirokazu Takata 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

cpumask: remove references to struct irqaction's mask field.

2009-03-30T11:35:14+00:00

Impact: cleanup

It's unused, since about 1995.  So remove all initialization of it in
preparation for actually removing the field.

Signed-off-by: Rusty Russell 
Acked-by: Thomas Gleixner

m32r/kernel/: cleanups

2008-09-27T09:27:21+00:00

This patch contains the following cleanups:
- make the following needlessly global code static:
  - entry.S: resume_userspace
  - process.c: pm_idle
  - process.c: default_idle()
  - smp.c: send_IPI_allbutself()
  - time.c: timer_interrupt()
  - time.c: struct irq0
  - traps.c: set_eit_vector_entries()
  - traps.c: kstack_depth_to_print
  - traps.c: show_trace()
  - traps.c: die_lock
- remove the following unused code:
  - head.S: startup_32
  - process.c: hlt_counter
  - process.c: disable_hlt()
  - process.c: enable_hlt()
  - process.c: dump_task_regs()
- remove the following variables and their usages since they were
  always 0:
  - irq.c: irq_err_count
  - irq.c: irq_mis_count

Signed-off-by: Adrian Bunk 
Signed-off-by: Andrew Morton 
Signed-off-by: Hirokazu Takata

M32R: cleanup struct irqaction initializers

2007-10-16T16:43:04+00:00

Signed-off-by: Thomas Gleixner 
Cc: Hirokazu Takata 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] Consolidate default sched_clock()

2007-02-11T18:51:28+00:00

Use attribute(weak).

Signed-off-by: Alexey Dobriyan 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds