linux-kernel - Re: [RFC PATCH 4/8] powerpc: add CPU field to struct thread

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Message-ID: <202109301045.15DDDA0B@keescook>
Date:   Thu, 30 Sep 2021 10:47:19 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Ard Biesheuvel <ardb@...nel.org>,
        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>,
        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>,
        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 4/8] powerpc: add CPU field to struct thread_info

On Thu, Sep 30, 2021 at 08:46:04AM +1000, Michael Ellerman wrote:
> Ard Biesheuvel <ardb@...nel.org> writes:
> > On Tue, 28 Sept 2021 at 02:16, Michael Ellerman <mpe@...erman.id.au> wrote:
> >>
> >> Michael Ellerman <mpe@...erman.id.au> writes:
> >> > Ard Biesheuvel <ardb@...nel.org> writes:
> >> >> 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 powerpc's definition
> >> >>> of struct thread_info.
> >> >>>
> >> >>> Signed-off-by: Ard Biesheuvel <ardb@...nel.org>
> >> >>
> >> >> Michael,
> >> >>
> >> >> Do you have any objections or issues with this patch or the subsequent
> >> >> ones cleaning up the task CPU kludge for ppc32? Christophe indicated
> >> >> that he was happy with it.
> >> >
> >> > No objections, it looks good to me, thanks for cleaning up that horror :)
> >> >
> >> > It didn't apply cleanly to master so I haven't tested it at all, if you can point me at a
> >> > git tree with the dependencies I'd be happy to run some tests over it.
> >>
> >> Actually I realised I can just drop the last patch.
> >>
> >> So that looks fine, passes my standard quick build & boot on qemu tests,
> >> and builds with/without stack protector enabled.
> >>
> >
> > Thanks.
> >
> > Do you have any opinion on how this series should be merged? Kees Cook
> > is willing to take them via his cross-arch tree, or you could carry
> > them if you prefer. Taking it via multiple trees at the same time is
> > going to be tricky, or take two cycles, with I'd prefer to avoid.
> 
> I don't really mind. If Kees is happy to take it then that's OK by me.
> 
> If Kees put the series in a topic branch based off rc2 then I could
> merge that, and avoid any conflicts.

I've created:

git://git.kernel.org/pub/scm/linux/kernel/git/kees/linux.git for-next/thread_info/cpu

it includes a --no-ff merge commit, which I'm not sure is desirable? Let
me know if I should adjust this, or if Linus will yell about this if I
send him a PR containing a merge commit? I'm not sure what's right here.

Thanks!

-- 
Kees Cook