linux-kernel - Re: [PATCH 1/2] ARM: fix building NOMMU ARMv4/v5 kernels

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Date:   Sat, 12 Mar 2022 10:14:51 +0100
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Arnd Bergmann <arnd@...nel.org>
Cc:     Russell King <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        kernel test robot <lkp@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Linus Walleij <linus.walleij@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Mark Rutland <mark.rutland@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] ARM: fix building NOMMU ARMv4/v5 kernels

On Wed, 9 Mar 2022 at 15:41, Arnd Bergmann <arnd@...nel.org> wrote:
>
> From: Arnd Bergmann <arnd@...db.de>
>
> The removal of the old-style irq entry broke obscure NOMMU
> configurations on machines that have an MMU:
>
> ld.lld: error: undefined symbol: generic_handle_arch_irq
>  referenced by kernel/entry-armv.o:(__irq_svc) in archive arch/arm/built-in.a
>
> A follow-up patch to convert nvic to the generic_handle_arch_irq()
> could have fixed this by removing the Kconfig conditional, but did
> it differently.
>
> Change the Kconfig logic so ARM machines now unconditionally
> enable the feature.
>
> I have also submitted a patch to remove support for the configurations
> that broke, but fixing the regression first is a trivial and correct
> change.
>
> Reported-by: kernel test robot <lkp@...el.com>
> Fixes: 54f481a2308e ("ARM: remove old-style irq entry")
> Fixes: 52d240871760 ("irqchip: nvic: Use GENERIC_IRQ_MULTI_HANDLER")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed by: Ard Biesheuvel <ardb@...nel.org>

> ---
> This patch should go into the arm/devel-stable branch that has
> the arm-irq-and-vmap-stacks-for-rmk patches from Ard
> ---
>  arch/arm/Kconfig        | 2 +-
>  drivers/irqchip/Kconfig | 1 -
>  2 files changed, 1 insertion(+), 2 deletions(-)
>
> diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
> index e9975ddd5034..5f0b40bab4fb 100644
> --- a/arch/arm/Kconfig
> +++ b/arch/arm/Kconfig
> @@ -60,7 +60,7 @@ config ARM
>         select GENERIC_CPU_AUTOPROBE
>         select GENERIC_EARLY_IOREMAP
>         select GENERIC_IDLE_POLL_SETUP
> -       select GENERIC_IRQ_MULTI_HANDLER if MMU
> +       select GENERIC_IRQ_MULTI_HANDLER
>         select GENERIC_IRQ_PROBE
>         select GENERIC_IRQ_SHOW
>         select GENERIC_IRQ_SHOW_LEVEL
> diff --git a/drivers/irqchip/Kconfig b/drivers/irqchip/Kconfig
> index 488eaa14d3a7..7038957f4a77 100644
> --- a/drivers/irqchip/Kconfig
> +++ b/drivers/irqchip/Kconfig
> @@ -58,7 +58,6 @@ config ARM_NVIC
>         bool
>         select IRQ_DOMAIN_HIERARCHY
>         select GENERIC_IRQ_CHIP
> -       select GENERIC_IRQ_MULTI_HANDLER
>
>  config ARM_VIC
>         bool
> --
> 2.29.2
>