linux-kernel - Re: [RFC PATCH 5/8] sched: move CPU field back into thread_info if THREAD_INFO_IN

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Message-ID: <CAHk-=wiaVLChOjJ=7fdoQXKE4JHb98MjDtg8pPkA8EYfd5aj3g@mail.gmail.com>
Date:   Tue, 14 Sep 2021 08:58:58 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Ard Biesheuvel <ardb@...nel.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 5/8] sched: move CPU field back into thread_info if THREAD_INFO_IN_TASK=y

On Tue, Sep 14, 2021 at 8:53 AM Ard Biesheuvel <ardb@...nel.org> wrote:
>
> task_cpu() takes a 'const struct task_struct *', whereas
> task_thread_info() takes a 'struct task_struct *'.

Oh, annoying, but that's easily fixed. Just make that

   static inline struct thread_info *task_thread_info(struct
task_struct *task) ..

be a simple

  #define task_thread_info(tsk) (&(tsk)->thread_info)

instead. That actually then matches the !THREAD_INFO_IN_TASK case anyway.

Make the commit comment be about how that fixes the type problem.

Because while in many cases inline functions are superior to macros,
it clearly isn't the case in this case.

              Linus