linux-kernel - Re: [RFC PATCH 1/8] arm64: add CPU field to struct thread

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Date:   Tue, 14 Sep 2021 17:42:40 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Keith Packard <keithpac@...zon.com>,
        Russell King <linux@...linux.org.uk>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Paul Mackerras <paulus@...ba.org>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Kees Cook <keescook@...omium.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        linux-s390 <linux-s390@...r.kernel.org>
Subject: Re: [RFC PATCH 1/8] arm64: add CPU field to struct thread_info

On Tue, 14 Sept 2021 at 17:41, Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> On Tue, Sep 14, 2021 at 5:10 AM Ard Biesheuvel <ardb@...nel.org> wrote:
> >
> > The CPU field will be moved back into thread_info even when
> > THREAD_INFO_IN_TASK is enabled, so add it back to arm64's definition of
> > struct thread_info.
>
> The series looks sane to me, but it strikes me that it's inconsistent
> - here for arm64, you make it unconditional, but for the other
> architectures you end up putting it inside a #ifdef CONFIG_SMP.
>
> Was there some reason for this odd behavior?
>

Yes. CONFIG_SMP is a 'def_bool y' on arm64.