linux-kernel - Re: [PATCH v2 32/62] objtool: Suppress section skipping warnings with --dryrun

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Message-ID: <20250528103453.GF31726@noisy.programming.kicks-ass.net>
Date: Wed, 28 May 2025 12:34:53 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Josh Poimboeuf <jpoimboe@...nel.org>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org,
	Petr Mladek <pmladek@...e.com>, Miroslav Benes <mbenes@...e.cz>,
	Joe Lawrence <joe.lawrence@...hat.com>,
	live-patching@...r.kernel.org, Song Liu <song@...nel.org>,
	laokz <laokz@...mail.com>, Jiri Kosina <jikos@...nel.org>,
	Marcos Paulo de Souza <mpdesouza@...e.com>,
	Weinan Liu <wnliu@...gle.com>,
	Fazla Mehrab <a.mehrab@...edance.com>,
	Chen Zhongjin <chenzhongjin@...wei.com>,
	Puranjay Mohan <puranjay@...nel.org>
Subject: Re: [PATCH v2 32/62] objtool: Suppress section skipping warnings
 with --dryrun

On Mon, May 26, 2025 at 12:52:40PM +0200, Peter Zijlstra wrote:
> On Fri, May 09, 2025 at 01:16:56PM -0700, Josh Poimboeuf wrote:
> > It's common to use --dryrun on binaries that have already been
> > processed.  Don't print the section skipping warnings in that case.
> 
> Ah, I rather like this warning, it gives me an easy check to see if the
> file has already been processed.
> 
> I typically do a OBJTOOL_ARGS="--backup" build and run dryrun debug
> sessions against those .orig files.

Turns out, you already broke this.. :-(

I'm now having a case where objtool fails on vmlinux.o and make happily
deletes vmlinux.o and I'm left empty handed.

Let me go resurrect --backup