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

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Date:   Tue, 21 Sep 2021 14:12:10 +0100
From:   Catalin Marinas <catalin.marinas@....com>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     linux-kernel@...r.kernel.org, Keith Packard <keithpac@...zon.com>,
        Russell King <linux@...linux.org.uk>,
        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>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>,
        linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-riscv@...ts.infradead.org,
        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 02:10:33PM +0200, Ard Biesheuvel wrote:
> THREAD_INFO_IN_TASK moved the CPU field out of thread_info, but this
> causes some issues on architectures that define raw_smp_processor_id()
> in terms of this field, due to the fact that #include'ing linux/sched.h
> to get at struct task_struct is problematic in terms of circular
> dependencies.
> 
> Given that thread_info and task_struct are the same data structure
> anyway when THREAD_INFO_IN_TASK=y, let's move it back so that having
> access to the type definition of struct thread_info is sufficient to
> reference the CPU number of the current task.
> 
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>

Acked-by: Catalin Marinas <catalin.marinas@....com>