linux-toradex.git/include/linux/interrupt.h, branch v2.6.20.17

[PATCH] sched: use softirq for load balancing

2006-12-10T17:55:42+00:00

Call rebalance_tick (renamed to run_rebalance_domains) from a newly introduced
softirq.

We calculate the earliest time for each layer of sched domains to be rescanned
(this is the rescan time for idle) and use the earliest of those to schedule
the softirq via a new field "next_balance" added to struct rq.

Signed-off-by: Christoph Lameter 
Cc: Peter Williams 
Cc: Nick Piggin 
Cc: Christoph Lameter 
Cc: "Siddha, Suresh B" 
Cc: "Chen, Kenneth W" 
Acked-by: Ingo Molnar 
Cc: KAMEZAWA Hiroyuki 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] add bottom_half.h

2006-12-07T16:39:20+00:00

With CONFIG_SMP=n:

  drivers/input/ff-memless.c:384: warning: implicit declaration of function 'local_bh_disable'
  drivers/input/ff-memless.c:393: warning: implicit declaration of function 'local_bh_enable'

Really linux/spinlock.h should include linux/interrupt.h.  But interrupt.h
includes sched.h which will need spinlock.h.

So the patch breaks the _bh declarations out into a separate header and
includes it in both interrupt.h and spinlock.h.

Cc: "Randy.Dunlap" 
Cc: Andi Kleen 
Cc: 
Cc: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

IRQ: Maintain regs pointer globally rather than passing to IRQ handlers

2006-10-05T14:10:12+00:00

Maintain a per-CPU global "struct pt_regs *" variable which can be used instead
of passing regs around manually through all ~1800 interrupt handlers in the
Linux kernel.

The regs pointer is used in few places, but it potentially costs both stack
space and code to pass it around.  On the FRV arch, removing the regs parameter
from all the genirq function results in a 20% speed up of the IRQ exit path
(ie: from leaving timer_interrupt() to leaving do_IRQ()).

Where appropriate, an arch may override the generic storage facility and do
something different with the variable.  On FRV, for instance, the address is
maintained in GR28 at all times inside the kernel as part of general exception
handling.

Having looked over the code, it appears that the parameter may be handed down
through up to twenty or so layers of functions.  Consider a USB character
device attached to a USB hub, attached to a USB controller that posts its
interrupts through a cascaded auxiliary interrupt controller.  A character
device driver may want to pass regs to the sysrq handler through the input
layer which adds another few layers of parameter passing.

I've build this code with allyesconfig for x86_64 and i386.  I've runtested the
main part of the code on FRV and i386, though I can't test most of the drivers.
I've also done partial conversion for powerpc and MIPS - these at least compile
with minimal configurations.

This will affect all archs.  Mostly the changes should be relatively easy.
Take do_IRQ(), store the regs pointer at the beginning, saving the old one:

	struct pt_regs *old_regs = set_irq_regs(regs);

And put the old one back at the end:

	set_irq_regs(old_regs);

Don't pass regs through to generic_handle_irq() or __do_IRQ().

In timer_interrupt(), this sort of change will be necessary:

	-	update_process_times(user_mode(regs));
	-	profile_tick(CPU_PROFILING, regs);
	+	update_process_times(user_mode(get_irq_regs()));
	+	profile_tick(CPU_PROFILING);

I'd like to move update_process_times()'s use of get_irq_regs() into itself,
except that i386, alone of the archs, uses something other than user_mode().

Some notes on the interrupt handling in the drivers:

 (*) input_dev() is now gone entirely.  The regs pointer is no longer stored in
     the input_dev struct.

 (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking.  It does
     something different depending on whether it's been supplied with a regs
     pointer or not.

 (*) Various IRQ handler function pointers have been moved to type
     irq_handler_t.

Signed-Off-By: David Howells 
(cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)

IRQ: Typedef the IRQ handler function type

2006-10-05T12:28:27+00:00

Typedef the IRQ handler function type.

Signed-Off-By: David Howells 
(cherry picked from 1356d1e5fd256997e3d3dce0777ab787d0515c7a commit)

[PATCH] lockdep: core, add enable/disable_irq_irqsave/irqrestore() APIs

2006-09-29T16:18:20+00:00

Introduce the disable_irq_nosync_lockdep_irqsave() and
enable_irq_lockdep_irqrestore() APIs.  These are needed for NE2000; basically
NE2000 calls disable_irq and enable_irq as locking against the IRQ handler,
but both in cases where interrupts are on and off.  This means that lockdep
needs to track the old state of the virtual irq flags on disable_irq, and
restore these at enable_irq time.

Signed-off-by: Arjan van de Ven 
Signed-off-by: Ingo Molnar 
Cc: Jeff Garzik 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] lockdep: irqtrace subsystem, core

2006-07-03T22:27:03+00:00

Accurate hard-IRQ-flags and softirq-flags state tracing.

This allows us to attach extra functionality to IRQ flags on/off
events (such as trace-on/off).

Signed-off-by: Ingo Molnar 
Signed-off-by: Arjan van de Ven 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] lockdep: add local_irq_enable_in_hardirq() API

2006-07-03T22:27:00+00:00

Introduce local_irq_enable_in_hardirq() API.  It is currently aliased to
local_irq_enable(), hence has no functional effects.

This API will be used by lockdep, but even without lockdep this will better
document places in the kernel where a hardirq context enables hardirqs.

Signed-off-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] lockdep: add disable/enable_irq_lockdep() API

2006-07-03T22:27:00+00:00

lockdep wants to use the disable_irq()/enable_irq() prototypes before they are
provied by the platform's asm/irq.h.  So move them out of the
CONFIG_GENERIC_HARDIRQS define - all architectures have a common prototype for
this anyway.

Add special lockdep variants of irq line disabling/enabling.

These should be used for locking constructs that know that a particular irq
context which is disabled, and which is the only irq-context user of a lock,
that it's safe to take the lock in the irq-disabled section without disabling
hardirqs.

[akpm@osdl.org: build fix]
Signed-off-by: Ingo Molnar 
Cc: Thomas Gleixner 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

[PATCH] genirq:fixup missing SA_PERCPU replacement

2006-07-03T00:29:22+00:00

The irqflags consolidation converted SA_PERCPU_IRQ to IRQF_PERCPU but
did not define the new constant.

Signed-off-by: Thomas Gleixner 
Signed-off-by: Linus Torvalds

[PATCH] irq-flags: consolidate flags for request_irq

2006-07-02T20:58:46+00:00

The recent interrupt rework introduced bit value conflicts with sparc.
Instead of introducing new architecture flags mess, move the interrupt SA_
flags out of the signal namespace and replace them by interrupt related flags.

This allows to remove the obsolete SA_INTERRUPT flag and clean up the bit
field values.

This patch:

Move the interrupt related SA_ flags out of linux/signal.h and rename them to
IRQF_ .  This moves the interrupt related flags out of the signal namespace
and allows to remove the architecture dependencies.

SA_INTERRUPT is not needed by userspace and glibc so it can be removed safely.

The existing SA_ constants are kept for easy transition and will be
removed after a 6 month grace period.

Signed-off-by: Thomas Gleixner 
Cc: Ingo Molnar 
Cc: "David S. Miller" 
Cc: Benjamin Herrenschmidt 
Cc: "Randy.Dunlap" 
Cc: Jaroslav Kysela 
Cc: Takashi Iwai 
Cc: "Antonino A. Daplas" 
Cc: Greg KH 
Cc: Russell King 
Cc: James Bottomley 
Cc: Kyle McMartin 
Cc: Jeff Garzik 
Cc: Mauro Carvalho Chehab 
Cc: Karsten Keil 
Cc: Jody McIntyre 
Cc: Ben Collins 
Cc: Stefan Richter 
Cc: Alan Cox 
Cc: Bartlomiej Zolnierkiewicz 
Cc: Dave Airlie 
Cc: Jens Axboe 
Cc: Chris Zankel 
Cc: Andi Kleen 
Cc: Miles Bader 
Cc: Jeff Dike 
Cc: Paolo 'Blaisorblade' Giarrusso 
Cc: Paul Mundt 
Cc: Kazumoto Kojima 
Cc: Martin Schwidefsky                                  Cc: Heiko Carstens 
Cc: Ralf Baechle 
Cc: Roman Zippel 
Cc: Geert Uytterhoeven 
Cc: Greg Ungerer 
Cc: "Luck, Tony" 
Cc: Yoshinori Sato 
Cc: David Howells 
Cc: Mikael Starvik 
Cc: Russell King 
Cc: Ivan Kokshaysky 
Cc: Richard Henderson 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds