linux-kernel - Re: [PATCH -tip] x86/stackprotector: Move stack canary to struct pcpu

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Message-ID: <CAFULd4YuL9DCOs23Ev+iXooirLfKT3O_9poSUM7JeW_dO34o9A@mail.gmail.com>
Date: Fri, 21 Feb 2025 15:33:19 +0100
From: Uros Bizjak <ubizjak@...il.com>
To: Ard Biesheuvel <ardb@...nel.org>
Cc: Brian Gerst <brgerst@...il.com>, x86@...nel.org, linux-kernel@...r.kernel.org, 
	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>, 
	Dave Hansen <dave.hansen@...ux.intel.com>, "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH -tip] x86/stackprotector: Move stack canary to struct pcpu_hot

On Fri, Feb 21, 2025 at 3:13 PM Ard Biesheuvel <ardb@...nel.org> wrote:

> > > I got a warning from the relocs tool, but not a hard error.  What
> > > compiler/linker are you using?
> > >
> > > Does the attached patch build in your configuration?
> >
> > Ah, the attached patch is similar to my previous approach, where the
> > build system *warned* on an offset (the patch was abandoned due to
> > Ard's request to put stack_canary to the *beginning* of struct
> > pcpu_hot, and this allowed for a simplified patch).
> >
> > The attached patch builds for me without warning/error for both, SMP
> > and !SMP build.
> >
>
> Did you try building modules too?

make -j 24 olddefconfig prepare modules_prepare bzImage modules

for defconfig, SMP and !SMP.

Uros.