Guilherme G. Piccoli c0af524372 genirq/affinity: Fix node generation from cpumask ... Commit 34c3d9819f ("genirq/affinity: Provide smarter irq spreading infrastructure") introduced a better IRQ spreading mechanism, taking account of the available NUMA nodes in the machine. Problem is that the algorithm of retrieving the nodemask iterates "linearly" based on the number of online nodes - some architectures present non-linear node distribution among the nodemask, like PowerPC. If this is the case, the algorithm lead to a wrong node count number and therefore to a bad/incomplete IRQ affinity distribution. For example, this problem were found in a machine with 128 CPUs and two nodes, namely nodes 0 and 8 (instead of 0 and 1, if it was linearly distributed). This led to a wrong affinity distribution which then led to a bad mq allocation for nvme driver. Finally, we take the opportunity to fix a comment regarding the affinity distribution when we have _more_ nodes than vectors. Fixes: 34c3d9819f ("genirq/affinity: Provide smarter irq spreading infrastructure") Reported-by: Gabriel Krisman Bertazi <gabriel@krisman.be> Signed-off-by: Guilherme G. Piccoli <gpiccoli@linux.vnet.ibm.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Gabriel Krisman Bertazi <gabriel@krisman.be> Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com> Cc: linux-pci@vger.kernel.org Cc: linuxppc-dev@lists.ozlabs.org Cc: hch@lst.de Link: http://lkml.kernel.org/r/1481738472-2671-1-git-send-email-gpiccoli@linux.vnet.ibm.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		2016-12-15 12:32:35 +01:00
..
affinity.c	genirq/affinity: Fix node generation from cpumask	2016-12-15 12:32:35 +01:00
autoprobe.c
chip.c	genirq: Make function __irq_do_set_handler() static	2016-09-25 16:46:52 -04:00
cpuhotplug.c
debug.h
devres.c
dummychip.c
generic-chip.c	genirq/generic_chip: Verify irqs_per_chip <= 32	2016-09-02 20:20:59 +02:00
handle.c
internals.h
ipi.c	genirq: Fix missing irq allocation affinity hint	2016-07-19 10:49:47 +02:00
irqdesc.c	Merge branch 'irq/for-block' into irq/core	2016-09-15 20:54:40 +02:00
irqdomain.c	genirq: Update stale comment for __irq_domain_add	2016-09-05 17:11:10 +02:00
Kconfig
Makefile
manage.c	genirq: Use irq type from irqdata instead of irqdesc	2016-11-08 15:15:19 +01:00
migration.c
msi.c	genirq/msi: Drop artificial PCI dependency	2016-11-22 11:00:19 +01:00
pm.c
proc.c
resend.c
settings.h
spurious.c