linux.git/kernel/irq/spurious.c, branch v2.6.35

genirq: Convert irq_desc.lock to raw_spinlock

2009-12-14T22:55:33+00:00

Convert locks which cannot be sleeping locks in preempt-rt to
raw_spinlocks.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Acked-by: Ingo Molnar

Merge branch 'for-next' into for-linus

2009-12-07T17:36:35+00:00

Conflicts:

	kernel/irq/chip.c

Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip

2009-12-05T17:53:08+00:00

* 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  genirq: Fix spurious irq seqfile conversion
  genirq: switch /proc/irq/*/spurious to seq_file
  irq: Do not attempt to create subdirectories if /proc/irq/ failed
  irq: Remove unused debug_poll_all_shared_irqs()
  irq: Fix docbook comments
  irq: trivial: Fix typo in comment for #endif

tree-wide: fix typos "couter" -> "counter"

2009-12-04T14:39:51+00:00

This patch was generated by

	git grep -E -i -l 'couter' | xargs -r perl -p -i -e 's/couter/counter/'

Signed-off-by: Uwe Kleine-König 
Signed-off-by: Jiri Kosina

genirq: try_one_irq() must be called with irq disabled

2009-11-07T20:44:45+00:00

Prarit reported:
=================================
[ INFO: inconsistent lock state ]
2.6.32-rc5 #1
---------------------------------
inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage.
swapper/0 [HC0[0]:SC1[1]:HE1:SE0] takes:
 (&irq_desc_lock_class){?.-...}, at: [] try_one_irq+0x32/0x138
{IN-HARDIRQ-W} state was registered at:
 [] __lock_acquire+0x2fc/0xd5d
 [] lock_acquire+0xf3/0x12d
 [] _spin_lock+0x40/0x89
 [] handle_level_irq+0x30/0x105
 [] handle_irq+0x95/0xb7
 [] do_IRQ+0x6a/0xe0
 [] ret_from_intr+0x0/0x16
irq event stamp: 195096
hardirqs last  enabled at (195096): [] _spin_unlock_irq+0x3a/0x5c
hardirqs last disabled at (195095): [] _spin_lock_irq+0x29/0x95
softirqs last  enabled at (195088): [] __do_softirq+0x1c1/0x1ef
softirqs last disabled at (195093): [] call_softirq+0x1c/0x30

other info that might help us debug this:
1 lock held by swapper/0:
 #0:  (kernel/irq/spurious.c:21){+.-...}, at: []
run_timer_softirq+0x1a9/0x315

stack backtrace:
Pid: 0, comm: swapper Not tainted 2.6.32-rc5 #1
Call Trace:
   [] valid_state+0x187/0x1ae
 [] mark_lock+0x129/0x253
 [] __lock_acquire+0x370/0xd5d
 [] lock_acquire+0xf3/0x12d
 [] _spin_lock+0x40/0x89
 [] try_one_irq+0x32/0x138
 [] poll_all_shared_irqs+0x41/0x6d
 [] poll_spurious_irqs+0x1c/0x49
 [] run_timer_softirq+0x239/0x315
 [] __do_softirq+0x102/0x1ef
 [] call_softirq+0x1c/0x30
 [] do_softirq+0x59/0xca
 [] irq_exit+0x58/0xae
 [] smp_apic_timer_interrupt+0x94/0xba
 [] apic_timer_interrupt+0x13/0x20

The reason is that try_one_irq() is called from hardirq context with
interrupts disabled and from softirq context (poll_all_shared_irqs())
with interrupts enabled.

Disable interrupts before calling it from poll_all_shared_irqs().

Reported-and-tested-by: Prarit Bhargava 
Signed-off-by: Yong Zhang 
LKML-Reference: <1257563773-4620-1-git-send-email-yong.zhang0@gmail.com>
Signed-off-by: Thomas Gleixner

irq: Remove unused debug_poll_all_shared_irqs()

2009-11-04T13:22:21+00:00

commit 74296a8ed added this function for debug purposes, but it was
never used for anything. Remove it.

Signed-off-by: Thomas Gleixner

irq: Clean up by removing irqfixup MODULE_PARM_DESC()

2009-08-04T15:00:11+00:00

It's wrong (the parm takes no arguments) and compile-time wiped
away anyway (due to !MODULE).

Signed-off-by: Jiri Slaby 
LKML-Reference: <1248991326-26267-1-git-send-email-jirislaby@gmail.com>
Signed-off-by: Ingo Molnar

irq: provide debug_poll_all_shared_irqs() method under CONFIG_DEBUG_SHIRQ

2009-01-16T16:46:49+00:00

Provide a shared interrupt debug facility under CONFIG_DEBUG_SHIRQ:
it uses the existing irqpoll facilities to iterate through all
registered interrupt handlers and call those which can handle shared
IRQ lines.

This can be handy for suspend/resume debugging: if we call this function
early during resume we can trigger crashes in those drivers which have
incorrect assumptions about when exactly their ISRs will be called
during suspend/resume.

Signed-off-by: Ingo Molnar

irq: simplify for_each_irq_desc() usage

2008-12-26T08:48:18+00:00

Impact: cleanup

all for_each_irq_desc() usage point have !desc check.
then its check can move into for_each_irq_desc() macro.

Signed-off-by: KOSAKI Motohiro 
Acked-by: Yinghai Lu 
Signed-off-by: Ingo Molnar

sparse irq_desc[] array: core kernel and x86 changes

2008-12-08T13:31:51+00:00

Impact: new feature

Problem on distro kernels: irq_desc[NR_IRQS] takes megabytes of RAM with
NR_CPUS set to large values. The goal is to be able to scale up to much
larger NR_IRQS value without impacting the (important) common case.

To solve this, we generalize irq_desc[NR_IRQS] to an (optional) array of
irq_desc pointers.

When CONFIG_SPARSE_IRQ=y is used, we use kzalloc_node to get irq_desc,
this also makes the IRQ descriptors NUMA-local (to the site that calls
request_irq()).

This gets rid of the irq_cfg[] static array on x86 as well: irq_cfg now
uses desc->chip_data for x86 to store irq_cfg.

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