linux.git/kernel/irq/proc.c, branch v4.13

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

genirq: Remove unnecessary memset() calls

2016-06-10T15:07:50+00:00

sprintf() and snprintf() implementation of kernel guarantees that
its result is terminated with null byte if size is larger than 0. So we
don't need to call memset() at all.

Signed-off-by: Weongyo Jeong 
Link: http://lkml.kernel.org/r/1459451703-5744-1-git-send-email-weongyo.linux@gmail.com
Signed-off-by: Thomas Gleixner

genirq: Remove redundant NULL check of irq_desc

2016-06-10T15:07:49+00:00

for_each_irq_desc() macro has already skipped NULL irq_desc, don't
bother to check it again.

Signed-off-by: Jianyu Zhan 
Cc: mingo@kernel.org
Cc: yhlu.kernel@gmail.com
Link: http://lkml.kernel.org/r/1458395959-7046-1-git-send-email-nasa4836@gmail.com
Signed-off-by: Thomas Gleixner

genirq: Use a common macro to go through the actions list

2016-02-14T23:07:34+00:00

The irq code browses the list of actions differently to inspect the element
one by one. Even if it is not a problem, for the sake of consistent code,
provide a macro similar to for_each_irq_desc in order to have the same loop to
go through the actions list and use it in the code.

[ tglx: Renamed the macro ]

Signed-off-by: Daniel Lezcano 
Link: http://lkml.kernel.org/r/1452765253-31148-1-git-send-email-daniel.lezcano@linaro.org
Signed-off-by: Thomas Gleixner