linux-kernel - Re: [PATCH 2/3] arm: introduce IRQ stacks

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Date:   Wed, 21 Oct 2020 14:55:29 +0200
From:   Arnd Bergmann <arnd@...nel.org>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>
Cc:     Arnd Bergmann <arnd@...nel.org>,
        Maninder Singh <maninder1.s@...sung.com>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Jian Cai <caij2003@...il.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Marc Zyngier <maz@...nel.org>,
        Valentin Schneider <valentin.schneider@....com>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        Nathan Huckleberry <nhuck@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dmitry Safonov <0x7f454c46@...il.com>,
        Will Deacon <will@...nel.org>, v.narang@...sung.com,
        a.sahrawat@...sung.com,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/3] arm: introduce IRQ stacks

On Wed, Oct 21, 2020 at 2:45 PM Russell King - ARM Linux admin
<linux@...linux.org.uk> wrote:
> On Wed, Oct 21, 2020 at 02:42:48PM +0200, Arnd Bergmann wrote:
> > >
> > > - define 'current' as 'this_cpu_read_stable(current_task);'
> > > - convert to CONFIG_THREAD_INFO_IN_TASK
>
> That means we need to also code that up in assembly - remember, we
> need to access thread_info from assembly code.

Are there any obvious places that need patching aside from
.macro get_thread_info? I did expect the above conversion to
be somewhat more complicated than Maninder's original patch,
but that part seems easy enough.

       Arnd