linux-hardening - Re: [PATCH v5 24/32] ARM: run softirqs on the per-CPU IRQ stack

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Date:   Tue, 22 Mar 2022 10:04:07 +0100
From:   Sebastian Andrzej Siewior <bigeasy@...utronix.de>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linux-hardening@...r.kernel.org, Nicolas Pitre <nico@...xnic.net>,
        Arnd Bergmann <arnd@...db.de>,
        Kees Cook <keescook@...omium.org>,
        Keith Packard <keithpac@...zon.com>,
        Linus Walleij <linus.walleij@...aro.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tony Lindgren <tony@...mide.com>,
        Marc Zyngier <maz@...nel.org>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Jesse Taube <mr.bossman075@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH v5 24/32] ARM: run softirqs on the per-CPU IRQ stack

On 2022-01-24 18:47:36 [+0100], Ard Biesheuvel wrote:
> @@ -58,6 +61,17 @@ static void __init init_irq_stacks(void)
>  	}
>  }
>  
> +static void ____do_softirq(void *arg)
> +{
> +	__do_softirq();
> +}
> +
> +void do_softirq_own_stack(void)
> +{
> +	call_with_stack(____do_softirq, NULL,
> +			__this_cpu_read(irq_stack_ptr));
> +}
> +

Do I miss the obvious here or is the irq_stack_ptr only used for
softirqs and not for hardirqs?

>  int arch_show_interrupts(struct seq_file *p, int prec)
>  {
>  #ifdef CONFIG_FIQ

Sebastian