This series solves some inconsistency with how IRQ affinity masks are
handled between SMP and non-SMP configurations.
In non-SMP configs, an IRQ's true affinity is always cpumask_of(0), so
irq_{,data_}get_affinity_mask now return that, instead of returning an
uninitialized per-IRQ cpumask. This change makes iterating over the
affinity mask do the right thing in both SMP and non-SMP configurations.
To accomplish that:
- patches 1-3 disable some library code that was broken anyway on !SMP
- patches 4-7 refactor the code so that irq_{,data_}get_affinity_mask
can return a const cpumask, since that is what cpumask_of provides
- patch 8 drops the per-IRQ cpumask and replaces it with cpumask_of(0)
This series was split from the v2 series here, which uses the new
behavior in the RISC-V PLIC irqchip driver:
https://lore.kernel.org/lkml/20220616064028.57933-1-samuel@xxxxxxxxxxxx/
Changes in v3:
- New patch to fix build errors in uniprocessor MIPS configs
- New patch to drop irq_init_effective_affinity
- New patch to introduce irq_data_update_affinity
- New patch to make the returned cpumasks const
- Use cpumask_of(0) instead of cpu_possible_mask
Changes in v2:
- New patch to prevent GENERIC_IRQ_IPI from being selected on !SMP
Samuel Holland (8):
irqchip/mips-gic: Only register IPI domain when SMP is enabled
genirq: GENERIC_IRQ_IPI depends on SMP
genirq: GENERIC_IRQ_EFFECTIVE_AFF_MASK depends on SMP
genirq: Drop redundant irq_init_effective_affinity
genirq: Refactor accessors to use irq_data_get_affinity_mask
genirq: Add and use an irq_data_update_affinity helper
genirq: Return a const cpumask from irq_data_get_affinity_mask
genirq: Provide an IRQ affinity mask in non-SMP configs
arch/alpha/kernel/irq.c | 2 +-
arch/arm/mach-hisi/Kconfig | 2 +-
arch/ia64/kernel/iosapic.c | 2 +-
arch/ia64/kernel/irq.c | 4 +-
arch/ia64/kernel/msi_ia64.c | 4 +-
arch/mips/cavium-octeon/octeon-irq.c | 4 +-
arch/parisc/kernel/irq.c | 2 +-
arch/sh/kernel/irq.c | 7 +--
arch/x86/hyperv/irqdomain.c | 2 +-
arch/xtensa/kernel/irq.c | 7 +--
drivers/iommu/hyperv-iommu.c | 2 +-
drivers/irqchip/Kconfig | 19 +++----
drivers/irqchip/irq-bcm6345-l1.c | 4 +-
drivers/irqchip/irq-mips-gic.c | 80 +++++++++++++++++++---------
drivers/parisc/iosapic.c | 2 +-
drivers/pci/controller/pci-hyperv.c | 10 ++--
drivers/sh/intc/chip.c | 2 +-
drivers/xen/events/events_base.c | 7 +--
include/linux/irq.h | 34 ++++++++----
kernel/irq/Kconfig | 2 +
kernel/irq/chip.c | 8 +--
kernel/irq/debugfs.c | 2 +-
kernel/irq/ipi.c | 16 +++---
kernel/irq/manage.c | 10 +---
24 files changed, 140 insertions(+), 94 deletions(-)
--
2.35.1
