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Subject: Re: [PATCH 2/2] parisc: Remove unnecessary NULL check of the
 kstat_irqs field
To: Radu Rendec <radu@rendec.net>,
 "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>,
 Thomas Gleixner <tglx@kernel.org>
Cc: linux-parisc@vger.kernel.org, linux-kernel@vger.kernel.org
References: <20260705210951.2717741-1-radu@rendec.net>
 <20260705210951.2717741-3-radu@rendec.net>
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On 7/5/26 23:09, Radu Rendec wrote:
> 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.
>=20
> 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().
>=20
> 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).
>=20
> The previous patch in this series makes a similar change across the
> generic IRQ code in kernel/irq/irqdesc.c, and provides a more detailed
> explanation of why kstat_irqs is guaranteed to be non-NULL.
>=20
> Signed-off-by: Radu Rendec <radu@rendec.net>
> ---
>   arch/parisc/kernel/smp.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)

Acked-by: Helge Deller <deller@gmx.de>