linux-kernel - Re: [PATCH v3 0/2] objtool: Add option to fail build on vmlinux warnings

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Message-ID: <20250207214113.GB661404@ax162>
Date: Fri, 7 Feb 2025 14:41:13 -0700
From: Nathan Chancellor <nathan@...nel.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Brendan Jackman <jackmanb@...gle.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masahiro Yamada <masahiroy@...nel.org>,
	Nicolas Schier <nicolas@...sle.eu>, linux-kernel@...r.kernel.org,
	linux-kbuild@...r.kernel.org
Subject: Re: [PATCH v3 0/2] objtool: Add option to fail build on vmlinux
 warnings

On Thu, Feb 06, 2025 at 06:51:27PM -0800, Josh Poimboeuf wrote:
> On Thu, Feb 06, 2025 at 10:10:36AM -0700, Nathan Chancellor wrote:
> > Right, I think gating on '!COMPILE_TEST' would not be a terrible way to
> > introduce it. We would definitely want to remove that dependency as
> > soon as possible because we want compile testers to be qble to find
> > these problems and have them be noticeable but it should make the
> > introduction of CONFIG_OBJTOOL_WERROR less disruptive.
> 
> I want to get CONFIG_OBJTOOL_WERROR merged soon.  I'm working on some
> other patches to go along with it that will hopefully ease some of the
> pain.  I'll post those soon and then hopefully we can get it into
> linux-next.

Sounds good to me, getting it into linux-next will give us a good idea
of how disruptive it may be.

> I didn't quite follow the OBJTOOL_FLAGS idea.  We already have
> OBJTOOL_ARGS which allows adding arguments (though not removing them),
> was it mean to be something like that?

Yes, I should have prefaced "if it does not already exist" since I did
not realize that there was already support for adding to objtool
arguments via an environment/make variable already.

Cheers,
Nathan