linux-kernel - Re: [PATCH v2 0/2] objtool: Add option to fail build on vmlinux warnings

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Message-ID: <CA+i-1C3ry8eeJ3ZgEUw+7=RteVvq61xcphg8KaYf2GBRr1mEnQ@mail.gmail.com>
Date: Fri, 20 Dec 2024 11:30:06 +0000
From: Brendan Jackman <jackmanb@...gle.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: Nathan Chancellor <nathan@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
	Peter Zijlstra <peterz@...radead.org>, Masahiro Yamada <masahiroy@...nel.org>, 
	Nicolas Schier <nicolas@...sle.eu>, linux-kernel@...r.kernel.org, 
	linux-kbuild@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 0/2] objtool: Add option to fail build on vmlinux warnings

On Thu, 19 Dec 2024 at 22:56, Josh Poimboeuf <jpoimboe@...nel.org> wrote:
> One thing that can help is to "export OBJTOOL_VERBOSE=1", which will
> tell objtool to disassemble any affected functions and show a backtrace
> with all the taken branches leading up to the warning (if applicable).
> Maybe that should be the default for --Werror.

This sounds very useful, I will do this for v3 unless anyone objects.
If we're failing the build the risk of a mega-verbose splat seems like
a good tradeoff vs the risk of the user having to go and read the
objtool code.