linux-kernel - Re: [RFC PATCH 3/8] s390: add CPU field to struct thread

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Message-ID: <CAMj1kXGfPYBRKoj5eBefr61kHc=m336g0EbPUeDRy+GZVGw26w@mail.gmail.com>
Date:   Tue, 28 Sep 2021 15:52:57 +0200
From:   Ard Biesheuvel <ardb@...nel.org>
To:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>
Cc:     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>,
        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 <linux-arm-kernel@...ts.infradead.org>,
        "open list:LINUX FOR POWERPC (32-BIT AND 64-BIT)" 
        <linuxppc-dev@...ts.ozlabs.org>,
        linux-riscv <linux-riscv@...ts.infradead.org>,
        "open list:S390" <linux-s390@...r.kernel.org>
Subject: Re: [RFC PATCH 3/8] s390: add CPU field to struct thread_info

On Tue, 14 Sept 2021 at 14:11, 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 s390's definition of
> struct thread_info.
>
> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> ---
>  arch/s390/include/asm/thread_info.h | 1 +
>  1 file changed, 1 insertion(+)
>

Heiko, Christian, Vasily,

Do you have any objections to this change? If you don't, could you
please ack it so it can be taken through another tree (or if that is
problematic for you, could you please propose another way of merging
these changes?)

Thanks,
Ard.

> diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h
> index e6674796aa6f..b2ffcb4fe000 100644
> --- a/arch/s390/include/asm/thread_info.h
> +++ b/arch/s390/include/asm/thread_info.h
> @@ -37,6 +37,7 @@
>  struct thread_info {
>         unsigned long           flags;          /* low level flags */
>         unsigned long           syscall_work;   /* SYSCALL_WORK_ flags */
> +       unsigned int            cpu;            /* current CPU */
>  };
>
>  /*
> --
> 2.30.2
>