linux-toradex.git/kernel/irq/proc.c, branch v4.14-rc3

genirq/proc: Avoid uninitalized variable warning

2017-08-25T20:40:26+00:00

kernel/irq/proc.c: In function ‘show_irq_affinity’:
include/linux/cpumask.h:24:29: warning: ‘mask’ may be used uninitialized in this function [-Wmaybe-uninitialized]
 #define cpumask_bits(maskp) ((maskp)->bits)

gcc is silly, but admittedly it can't know that this won't be called with
anything else than the enumerated constants.

Shut up the warning by creating a default clause.

Fixes: 6bc6d4abd22e ("genirq/proc: Use the the accessor to report the effective affinity
Signed-off-by: Thomas Gleixner

genirq: Fix semicolon.cocci warnings

2017-08-25T20:40:25+00:00

kernel/irq/proc.c:69:2-3: Unneeded semicolon

Remove unneeded semicolon.

Generated by: scripts/coccinelle/misc/semicolon.cocci

Fixes: 0d3f54257dc3 ("genirq: Introduce effective affinity mask")
Signed-off-by: Fengguang Wu 
Signed-off-by: Thomas Gleixner 
Cc: kbuild-all@01.org
Link: http://lkml.kernel.org/r/20170822075053.GA93890@lkp-hsx02

genirq/proc: Use the the accessor to report the effective affinity

2017-08-18T08:54:39+00:00

If CONFIG_GENERIC_IRQ_EFFECTIVE_AFF_MASK is defined, but that the
interrupt is not single target, the effective affinity reported in
/proc/irq/x/effective_affinity will be empty, which is not the truth.

Instead, use the accessor to report the affinity, which will pick
the right mask.

Signed-off-by: Marc Zyngier 
Signed-off-by: Thomas Gleixner 
Cc: Andrew Lunn 
Cc: James Hogan 
Cc: Jason Cooper 
Cc: Paul Burton 
Cc: Chris Zankel 
Cc: Kevin Cernekee 
Cc: Wei Xu 
Cc: Max Filippov 
Cc: Florian Fainelli 
Cc: Gregory Clement 
Cc: Matt Redfearn 
Cc: Sebastian Hesselbarth 
Link: http://lkml.kernel.org/r/20170818083925.10108-3-marc.zyngier@arm.com

genirq: Introduce effective affinity mask

2017-06-22T16:21:20+00:00

There is currently no way to evaluate the effective affinity mask of a
given interrupt. Many irq chips allow only a single target CPU or a subset
of CPUs in the affinity mask.

Updating the mask at the time of setting the affinity to the subset would
be counterproductive because information for cpu hotplug about assigned
interrupt affinities gets lost. On CPU hotplug it's also pointless to force
migrate an interrupt, which is not targeted at the CPU effectively. But
currently the information is not available.

Provide a seperate mask to be updated by the irq_chip->irq_set_affinity()
implementations. Implement the read only proc files so the user can see the
effective mask as well w/o trying to deduce it from /proc/interrupts.

Signed-off-by: Thomas Gleixner 
Cc: Jens Axboe 
Cc: Marc Zyngier 
Cc: Michael Ellerman 
Cc: Keith Busch 
Cc: Peter Zijlstra 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20170619235446.247834245@linutronix.de

genirq/proc: Replace ever repeating type cast

2017-06-22T16:21:20+00:00

The proc file setup repeats the same ugly type cast for the irq number over
and over. Do it once and hand in the local void pointer.

Signed-off-by: Thomas Gleixner 
Cc: Jens Axboe 
Cc: Marc Zyngier 
Cc: Michael Ellerman 
Cc: Keith Busch 
Cc: Peter Zijlstra 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20170619235446.160866358@linutronix.de

genirq: Remove pointless arg from show_irq_affinity

2017-06-22T16:21:19+00:00

The third argument of the internal helper function is unused. Remove it.

Signed-off-by: Thomas Gleixner 
Cc: Jens Axboe 
Cc: Marc Zyngier 
Cc: Michael Ellerman 
Cc: Keith Busch 
Cc: Peter Zijlstra 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20170619235446.004958600@linutronix.de

genirq: Remove mask argument from setup_affinity()

2017-06-22T16:21:14+00:00

No point to have this alloc/free dance of cpumasks. Provide a static mask
for setup_affinity() and protect it proper.

Signed-off-by: Thomas Gleixner 
Cc: Jens Axboe 
Cc: Marc Zyngier 
Cc: Michael Ellerman 
Cc: Keith Busch 
Cc: Peter Zijlstra 
Cc: Christoph Hellwig 
Link: http://lkml.kernel.org/r/20170619235444.851571573@linutronix.de

genirq: Fix /proc/interrupts output alignment

2017-02-10T19:17:52+00:00

If the irq_desc being output does not have a domain associated the
information following the 'name' is not aligned correctly.

Signed-off-by: H Hartley Sweeten 
Link: http://lkml.kernel.org/r/20170210165416.5629-1-hsweeten@visionengravers.com
Signed-off-by: Thomas Gleixner

Merge branch 'irq/for-block' into irq/core

2016-07-04T10:26:05+00:00

Pull the irq affinity managing code which is in a seperate branch for block
developers to pull.

genirq: Introduce IRQD_AFFINITY_MANAGED flag

2016-07-04T10:25:13+00:00

Interupts marked with this flag are excluded from user space interrupt
affinity changes. Contrary to the IRQ_NO_BALANCING flag, the kernel internal
affinity mechanism is not blocked.

This flag will be used for multi-queue device interrupts.

Signed-off-by: Thomas Gleixner 
Cc: Christoph Hellwig 
Cc: linux-block@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-nvme@lists.infradead.org
Cc: axboe@fb.com
Cc: agordeev@redhat.com
Link: http://lkml.kernel.org/r/1467621574-8277-3-git-send-email-hch@lst.de
Signed-off-by: Thomas Gleixner