linux-kernel - Re: [RFC PATCH 2/9] x86/purgatory: Simplify stack handling

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Message-ID: <20240426215351.GA3278657@dev-arch.thelio-3990X>
Date: Fri, 26 Apr 2024 14:53:51 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Justin Stitt <justinstitt@...gle.com>
Cc: Ard Biesheuvel <ardb+git@...gle.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Ard Biesheuvel <ardb@...nel.org>,
	Arnd Bergmann <arnd@...db.de>,
	Eric Biederman <ebiederm@...ssion.com>, kexec@...ts.infradead.org,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Kees Cook <keescook@...omium.org>, Bill Wendling <morbo@...gle.com>,
	Masahiro Yamada <masahiroy@...nel.org>
Subject: Re: [RFC PATCH 2/9] x86/purgatory: Simplify stack handling

On Fri, Apr 26, 2024 at 09:32:52PM +0000, Justin Stitt wrote:
> Hi,
> 
> On Wed, Apr 24, 2024 at 11:26:59AM -0700, Nathan Chancellor wrote:
> > On Wed, Apr 24, 2024 at 05:53:12PM +0200, Ard Biesheuvel wrote:
> > >  arch/x86/purgatory/stack.S        | 18 ------------------
> > 
> > This needs a small fix up to build.
> > 
> >   make[6]: *** No rule to make target 'arch/x86/purgatory/stack.o', needed by 'arch/x86/purgatory/purgatory.ro'.
> > 
> 
> I was trying to reproduce this build failure, but to no avail. I am
> curious what your build target / build command was.
> 
> It is clear that stack.S has been removed so your change makes sense, I
> don't doubt that -- I just cannot get that specific error message you

Odd, I was using my distribution configuration for the test but it is
easily reproducible with allmodconfig:

  $ make -skj"$(nproc)" ARCH=x86_64 LLVM=1 allmodconfig arch/x86/purgatory/
  make[6]: *** No rule to make target 'arch/x86/purgatory/stack.o', needed by 'arch/x86/purgatory/purgatory.ro'.
  ...

> encountered (what is a .ro file supposed to be, anyway?).

Read only? Relocatable object? *shrug*

Cheers,
Nathan