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    SubjectRe: [RFC PATCH v2 06/21] RISC-V: Kconfig: Select deferred GSI probe for ACPI systems
    On Thu, Oct 26, 2023 at 01:53:29AM +0530, Sunil V L wrote:
    > On RISC-V platforms, apart from root interrupt controllers (which
    > provide local interrupts and IPI), other interrupt controllers in the
    > hierarchy are probed late. Enable this select this CONFIG option for
    > RISC-V platforms so that device drivers which connect to deferred
    > interrupt controllers can take appropriate action.

    Quite a bit of this series seems related to the question of interrupt
    controllers being probed "late".

    I don't see anything specific about *how* late this might be, but from
    the use of -EPROBE_DEFER in individual drivers (8250_pnp explicitly,
    and acpi_register_gsi() and pnp_irq() and acpi_pci_irq_enable(), which
    are called from driver .probe() paths) it seems like interrupt
    controllers might be detected even after devices that use them.

    That seems like a fairly invasive change to the driver probe flow.
    If we really need to do that, I think it might merit a little more
    background as justification since we haven't had to do it for any
    other arch yet.

    Bjorn

    > Signed-off-by: Sunil V L <sunilvl@ventanamicro.com>
    > ---
    > arch/riscv/Kconfig | 1 +
    > 1 file changed, 1 insertion(+)
    >
    > diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
    > index 8c105a151e12..b62441aefa6a 100644
    > --- a/arch/riscv/Kconfig
    > +++ b/arch/riscv/Kconfig
    > @@ -12,6 +12,7 @@ config 32BIT
    >
    > config RISCV
    > def_bool y
    > + select ARCH_ACPI_DEFERRED_GSI if ACPI
    > select ACPI_GENERIC_GSI if ACPI
    > select ACPI_MCFG if (ACPI && PCI)
    > select ACPI_REDUCED_HARDWARE_ONLY if ACPI
    > --
    > 2.39.2
    >
    >
    > _______________________________________________
    > linux-arm-kernel mailing list
    > linux-arm-kernel@lists.infradead.org
    > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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