linux-kernel - Re: parisc build failures in mainline kernel

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Message-ID: <202111051254.1AAE34273@keescook>
Date:   Fri, 5 Nov 2021 12:55:15 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Ard Biesheuvel <ardb@...nel.org>
Cc:     Guenter Roeck <linux@...ck-us.net>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Helge Deller <deller@....de>,
        linux-parisc <linux-parisc@...r.kernel.org>
Subject: Re: parisc build failures in mainline kernel

On Fri, Nov 05, 2021 at 08:43:52PM +0100, Ard Biesheuvel wrote:
> On Fri, 5 Nov 2021 at 20:43, Kees Cook <keescook@...omium.org> wrote:
> >
> > On Wed, Nov 03, 2021 at 09:45:47PM -0700, Linus Torvalds wrote:
> > > On Wed, Nov 3, 2021 at 9:30 PM Guenter Roeck <linux@...ck-us.net> wrote:
> > > >
> > > > Unfortunately not. With that patch it complains about task_struct.
> > >
> > > Gaah. You'll need something like this too
> > >
> > > -       DEFINE(TASK_CPU, offsetof(struct task_struct, cpu));
> > > +       DEFINE(TASK_CPU, offsetof(struct task_struct, thread_info.cpu));
> > >
> > > in arch/parisc/kernel/asm-offsets.c.
> > >
> > > And really, it should probably be renamed as TASK_TI_CPU, but then you
> > > have to rename all the uses too.
> > >
> > > There might be other details like that lurking.
> >
> > I'll check this out too if Ard doesn't beat me to it. Thanks for the
> > investigation and sorry for the breakage!
> >
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=2a2e8202c7a16a85a881ad2b6e32ccbebdc01dda

Heh. Ard did, in fact, beat me to it. Thank you! :)

-Kees

-- 
Kees Cook