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

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Message-ID: <20250605073246.GM39944@noisy.programming.kicks-ass.net>
Date: Thu, 5 Jun 2025 09:32:46 +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 Wed, Jun 04, 2025 at 05:19:51PM -0700, Josh Poimboeuf wrote:
> On Wed, May 28, 2025 at 12:34:53PM +0200, Peter Zijlstra wrote:
> > 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
> 
> Yeah, as I just mentioned in that other email, --verbose should give you
> what you need.  It also prints the cmdline args, which is nice.
> 
> But also, feel free to resurrect --backup, or you can yell at me to do
> it as the backup code changed a bit.

I have the patch somewhere, failed to send it out. I'll try and dig it
out later today.