linux/kernel/irq
Thomas Gleixner 651ca2c004 genirq/matrix: Handle CPU offlining proper
At CPU hotunplug the corresponding per cpu matrix allocator is shut down and
the allocated interrupt bits are discarded under the assumption that all
allocated bits have been either migrated away or shut down through the
managed interrupts mechanism.

This is not true because interrupts which are not started up might have a
vector allocated on the outgoing CPU. When the interrupt is started up
later or completely shutdown and freed then the allocated vector is handed
back, triggering warnings or causing accounting issues which result in
suspend failures and other issues.

Change the CPU hotplug mechanism of the matrix allocator so that the
remaining allocations at unplug time are preserved and global accounting at
hotplug is correctly readjusted to take the dormant vectors into account.

Fixes: 2f75d9e1c9 ("genirq: Implement bitmap matrix allocator")
Reported-by: Yuriy Vostrikov <delamonpansie@gmail.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Yuriy Vostrikov <delamonpansie@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/20180222112316.849980972@linutronix.de
2018-02-22 22:05:43 +01:00
..
affinity.c genirq/affinity: assign vectors to all possible CPUs 2018-01-12 11:01:38 -07:00
autoprobe.c genirq: Make legacy autoprobing work again 2018-02-01 11:09:40 +01:00
chip.c genirq: Make legacy autoprobing work again 2018-02-01 11:09:40 +01:00
cpuhotplug.c genirq/cpuhotplug: Add sanity check for effective affinity mask 2017-10-09 13:26:48 +02:00
debug.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/pmladek/printk 2018-02-01 13:36:15 -08:00
debugfs.c genirq: Introduce IRQD_CAN_RESERVE flag 2017-12-29 21:13:04 +01:00
devres.c irq/generic-chip: Provide devm_irq_setup_generic_chip() 2017-06-21 15:53:11 +02:00
dummychip.c Merge branch 'linus' into irq/core 2015-06-05 22:25:01 +02:00
generic-chip.c kernel/irq: Extend lockdep class for request mutex 2017-12-28 12:26:35 +01:00
handle.c There has been a fair amount of activity in the docs tree this time 2017-07-03 21:13:25 -07:00
internals.h genirq: Make legacy autoprobing work again 2018-02-01 11:09:40 +01:00
ipi.c genirq/ipi: Fixup checks against nr_cpu_ids 2017-08-20 10:49:05 +02:00
irq_sim.c genirq/irq_sim: Add a devres variant of irq_sim_init() 2017-08-16 16:40:02 +02:00
irqdesc.c arm64 updates for 4.15 2017-11-15 10:56:56 -08:00
irqdomain.c irqdomain: Re-use DEFINE_SHOW_ATTRIBUTE() macro 2018-02-16 14:22:34 +00:00
Kconfig irqdomain: Kill CONFIG_IRQ_DOMAIN_DEBUG 2018-01-24 12:32:58 +01:00
Makefile Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:33:11 -08:00
manage.c irqchip updates for 4.15, take #4 2017-11-14 11:23:05 +01:00
matrix.c genirq/matrix: Handle CPU offlining proper 2018-02-22 22:05:43 +01:00
migration.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
msi.c genirq/msi, x86/vector: Prevent reservation mode for non maskable MSI 2017-12-29 21:13:05 +01:00
pm.c genirq/PM: Properly pretend disabled state when force resuming interrupts 2017-07-17 22:32:20 +02:00
proc.c Merge branch 'irq-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2017-11-13 17:33:11 -08:00
resend.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
settings.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spurious.c genirq: remove unneeded kallsyms include 2018-02-06 18:32:47 -08:00
timings.c irq/timings: Use lockdep to assert IRQs are disabled/enabled 2017-11-08 11:13:52 +01:00