linux-toradex.git/kernel/irq/proc.c, branch v2.6.28.9

genirq: keep affinities set from userspace across free/request_irq()

2008-11-09T21:23:49+00:00

Impact: preserve user-modified affinities on interrupts

Kumar Galak noticed that commit
18404756765c713a0be4eb1082920c04822ce588 (genirq: Expose default irq
affinity mask (take 3))

overrides an already set affinity setting across a free /
request_irq(). Happens e.g. with ifdown/ifup of a network device.

Change the logic to mark the affinities as set and keep them
intact. This also fixes the unlocked access to irq_desc in
irq_select_affinity() when called from irq_affinity_proc_write()

Signed-off-by: Thomas Gleixner 
Signed-off-by: Ingo Molnar

irq: make variable static

2008-10-22T05:37:17+00:00

This variable is only used in the source file, so make it static.

Signed-off-by: Roel Kluin 
Signed-off-by: Ingo Molnar

genirq: cleanup the sparseirq modifications

2008-10-16T14:53:29+00:00

Signed-off-by: Thomas Gleixner

irq: replace loop with nr_irqs with for_each_irq_desc

2008-10-16T14:52:33+00:00

There are a handful of loops that go from 0 to nr_irqs and use
get_irq_desc() on them. These would allocate all the irq_desc
entries, regardless of the need for them.

Use the smarter for_each_irq_desc() iterator that will only iterate
over the present ones.

v2: make sure arch without GENERIC_HARDIRQS work too

Signed-off-by: Yinghai Lu 
Signed-off-by: Ingo Molnar

generic: sparse irqs: use irq_desc() together with dyn_array, instead of irq_desc[]

2008-10-16T14:52:29+00:00

add CONFIG_HAVE_SPARSE_IRQ to for use condensed array.
Get rid of irq_desc[] array assumptions.

Preallocate 32 irq_desc, and irq_desc() will try to get more.

( No change in functionality is expected anywhere, except the odd build
  failure where we missed a code site or where a crossing commit itroduces
  new irq_desc[] usage. )

v2: according to Eric, change get_irq_desc() to irq_desc()

Signed-off-by: Yinghai Lu 
Signed-off-by: Ingo Molnar

irq: introduce nr_irqs

2008-10-16T14:52:05+00:00

at this point nr_irqs is equal NR_IRQS

convert a few easy users from NR_IRQS to dynamic nr_irqs.

v2: according to Eric, we need to take care of arch without generic_hardirqs

Signed-off-by: Yinghai Lu 
Signed-off-by: Ingo Molnar

genirq: switch /proc/irq/*/smp_affinity et al to seqfiles

2008-08-12T23:07:30+00:00

Switch /proc/irq/*/smp_affinity , /proc/irq/default_smp_affinity to
seq_files.

cat(1) reads with 1024 chunks by default, with high enough NR_CPUS, there
will be -EINVAL.

As side effect, there are now two less users of the ->read_proc interface.

Signed-off-by: Alexey Dobriyan 
Cc: Paul Jackson 
Cc: Mike Travis 
Cc: Al Viro 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

genirq: Expose default irq affinity mask (take 3)

2008-06-05T13:18:30+00:00

Current IRQ affinity interface does not provide a way to set affinity
for the IRQs that will be allocated/activated in the future.
This patch creates /proc/irq/default_smp_affinity that lets users set
default affinity mask for the newly allocated IRQs. Changing the default
does not affect affinity masks for the currently active IRQs, they
have to be changed explicitly.

Updated based on Paul J's comments and added some more documentation.

Signed-off-by: Max Krasnyansky 
Cc: pj@sgi.com
Cc: a.p.zijlstra@chello.nl
Cc: tglx@linutronix.de
Cc: rdunlap@xenotime.net
Cc: mingo@elte.hu
Signed-off-by: Thomas Gleixner

x86: add /proc/irq/*/spurious to dump the spurious irq debugging state

2008-01-30T12:32:48+00:00

This is useful to debug problems with interrupt handlers that return
sometimes IRQ_NONE.

Signed-off-by: Andi Kleen 
Signed-off-by: Ingo Molnar 
Signed-off-by: Thomas Gleixner

x86_64: Report the pending irq if available in smp_affinity

2007-07-22T01:37:07+00:00

Otherwise smp_affinity would only update after the next interrupt
on x86 systems.

Cc: Thomas Gleixner 
Cc: Ingo Molnar 
Signed-off-by: Andi Kleen 
Signed-off-by: Linus Torvalds