linux-toradex.git/include/linux/interrupt.h, branch v3.14.3

genirq: Add devm_request_any_context_irq()

2014-02-09T14:27:21+00:00

Some drivers use request_any_context_irq() but there isn't a
devm_* function for it. Add one so that these drivers don't need
to explicitly free the irq on driver detach.

Signed-off-by: Stephen Boyd 
Cc: linux-arm-kernel@lists.infradead.org
Cc: Dmitry Torokhov 
Link: http://lkml.kernel.org/r/1388709460-19222-3-git-send-email-sboyd@codeaurora.org
Signed-off-by: Thomas Gleixner

softirq: use const char * const for softirq_to_name, whitespace neatening

2014-01-28T05:02:40+00:00

Reduce data size a little.
Reduce checkpatch noise.

$ size kernel/softirq.o*
   text	   data	    bss	    dec	    hex	filename
  11554	   6013	   4008	  21575	   5447	kernel/softirq.o.new
  11474	   6093	   4008	  21575	   5447	kernel/softirq.o.old

Signed-off-by: Joe Perches 
Cc: Frederic Weisbecker 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

revert "softirq: Add support for triggering softirq work on softirqs"

2013-11-15T00:32:22+00:00

This commit was incomplete in that code to remove items from the per-cpu
lists was missing and never acquired a user in the 5 years it has been in
the tree.  We're going to implement what it seems to try to archive in a
simpler way, and this code is in the way of doing so.

Signed-off-by: Christoph Hellwig 
Cc: Jan Kara 
Cc: Jens Axboe 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

irq: Consolidate do_softirq() arch overriden implementations

2013-10-01T10:53:25+00:00

All arch overriden implementations of do_softirq() share the following
common code: disable irqs (to avoid races with the pending check),
check if there are softirqs pending, then execute __do_softirq() on
a specific stack.

Consolidate the common parts such that archs only worry about the
stack switch.

Acked-by: Linus Torvalds 
Signed-off-by: Frederic Weisbecker 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Ingo Molnar 
Cc: Thomas Gleixner 
Cc: Peter Zijlstra 
Cc: H. Peter Anvin 
Cc: Linus Torvalds 
Cc: Paul Mackerras 
Cc: James Hogan 
Cc: James E.J. Bottomley 
Cc: Helge Deller 
Cc: Martin Schwidefsky 
Cc: Heiko Carstens 
Cc: David S. Miller 
Cc: Andrew Morton

Remove GENERIC_HARDIRQ config option

2013-09-13T13:09:52+00:00

After the last architecture switched to generic hard irqs the config
options HAVE_GENERIC_HARDIRQS & GENERIC_HARDIRQS and the related code
for !CONFIG_GENERIC_HARDIRQS can be removed.

Signed-off-by: Martin Schwidefsky

lib: cpu_rmap: avoid flushing all workqueues

2013-01-11T22:54:54+00:00

In some cases, free_irq_cpu_rmap() is called while holding a lock (eg
rtnl).  This can lead to deadlocks, because it invokes
flush_scheduled_work() which ends up waiting for whole system workqueue
to flush, but some pending works might try to acquire the lock we are
already holding.

This commit uses reference-counting to replace
irq_run_affinity_notifiers().  It also removes
irq_run_affinity_notifiers() altogether.

[akpm@linux-foundation.org: eliminate free_cpu_rmap, rename cpu_rmap_reclaim() to cpu_rmap_release(), propagate kref_put() retval from cpu_rmap_put()]
Signed-off-by: David Decotigny 
Reviewed-by: Ben Hutchings 
Acked-by: Eric Dumazet 
Reviewed-by: Josh Triplett 
Cc: "David S. Miller" 
Cc: Or Gerlitz 
Acked-by: Amir Vadai 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

time: RCU permitted to stop idle entry via softirq

2012-09-23T14:42:52+00:00

The can_stop_idle_tick() function complains if a softirq vector is
raised too late in the idle-entry process, presumably in order to
prevent dangling softirq invocations from being delayed across the
full idle period, which might be indefinitely long -- and if softirq
was asserted any later than the call to this function, such a delay
might well happen.

However, RCU needs to be able to use softirq to stop idle entry in
order to be able to drain RCU callbacks from the current CPU, which in
turn enables faster entry into dyntick-idle mode, which in turn reduces
power consumption.  Because RCU takes this action at a well-defined
point in the idle-entry path, it is safe for RCU to take this approach.

This commit therefore silences the error message that is sometimes
produced when the going-idle CPU suddenly finds that it has an RCU_SOFTIRQ
to process.  The error message will continue to be issued for other
softirq vectors.

Reported-by: Sedat Dilek 
Signed-off-by: Paul E. McKenney 
Signed-off-by: Paul E. McKenney 
Tested-by: Sedat Dilek 
Reviewed-by: Josh Triplett

random: final removal of IRQF_SAMPLE_RANDOM

2012-07-19T14:40:42+00:00

The IRQF_SAMPLE_RANDOM flag is finally gone from the kernel tree, only
three years late.  :-)

Signed-off-by: "Theodore Ts'o"

genirq: reimplement exit_irq_thread() hook via task_work_add()

2012-05-24T02:11:12+00:00

exit_irq_thread() and task->irq_thread are needed to handle the unexpected
(and unlikely) exit of irq-thread.

We can use task_work instead and make this all private to
kernel/irq/manage.c, cleanup plus micro-optimization.

1. rename exit_irq_thread() to irq_thread_dtor(), make it
   static, and move it up before irq_thread().

2. change irq_thread() to do task_work_add(irq_thread_dtor)
   at the start and task_work_cancel() before return.

   tracehook_notify_resume() can never play with kthreads,
   only do_exit()->exit_task_work() can call the callback
   and this is what we want.

3. remove task_struct->irq_thread and the special hook
   in do_exit().

Signed-off-by: Oleg Nesterov 
Reviewed-by: Thomas Gleixner 
Cc: David Howells 
Cc: Richard Kuo 
Cc: Linus Torvalds 
Cc: Alexander Gordeev 
Cc: Chris Zankel 
Cc: David Smith 
Cc: "Frank Ch. Eigler" 
Cc: Geert Uytterhoeven 
Cc: Larry Woodman 
Cc: Peter Zijlstra 
Cc: Tejun Heo 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Al Viro

genirq: Streamline irq_action

2012-04-19T11:56:55+00:00

There is no need to have flags as unsigned long. Make it unsigned int
and put it together with irq so it does not waste space on 64 bit.
Make irq unsigned int while at it.

Signed-off-by: Thomas Gleixner