parisc: Remove unnecessary NULL check of the kstat_irqs field

Browse source

The kstat_irqs field of struct irq_desc is used to store a per-cpu count
of interrupt events. It is initialized in init_desc(), along with all
the other fields in struct irq_desc that need explicit initialization,
and therefore it's always available (non-NULL) for any valid interrupt
descriptor.

On parisc, CONFIG_SPARSE_IRQ is disabled, interrupt descriptors are
allocated statically in the irq_desc[] array, and kstat_irqs is
initialized implicitly to NULL. The kstat_irqs field is initialized
later, for all descriptors, via start_kernel() -> early_irq_init() ->
init_desc().

smp_boot_one_cpu() is used only for CPU hotplugging. On a SMP system,
the boot CPU initializes the interrupt descriptors as described above,
and smp_boot_one_cpu() is called later, for the secondary CPU(s).

A previous change made similar changes across the generic interrupt code in
kernel/irq/irqdesc.c, and provides a more detailed explanation of why
kstat_irqs is guaranteed to be non-NULL.

Signed-off-by: Radu Rendec <radu@rendec.net>
Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Link: https://patch.msgid.link/20260705210951.2717741-3-radu@rendec.net

...

This commit is contained in:

Radu Rendec 2026-07-05 17:09:51 -04:00 • committed by Thomas Gleixner

parent 57d1220979

commit 2c27d9b154

1 changed files with 1 additions and 1 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

2

arch/parisc/kernel/smp.c

View file