linux-kernel - Re: [PATCH v2 01/10] objtool: Move header sync-check ealier in build

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Date:   Wed, 1 Apr 2020 14:55:14 +0200 (CEST)
From:   Miroslav Benes <mbenes@...e.cz>
To:     Julien Thierry <jthierry@...hat.com>
cc:     linux-kernel@...r.kernel.org, jpoimboe@...hat.com,
        peterz@...radead.org, raphael.gault@....com
Subject: Re: [PATCH v2 01/10] objtool: Move header sync-check ealier in
 build

On Wed, 1 Apr 2020, Julien Thierry wrote:

> 
> 
> On 4/1/20 1:32 PM, Miroslav Benes wrote:
> > On Fri, 27 Mar 2020, Julien Thierry wrote:
> > 
> >> Currently, the check of tools files against kernel equivalent is only
> >> done after every object file has been built.
> > 
> >> This means one might fix
> >> build issues against outdated headers without seeing a warning about
> >> this.
> > 
> > Could you explain the above in more detail, please?
> > 
> 
> I must admit that this patch is more fixing the issues I've faced while
> working on the arm64 support and sharing some kernel headers from the
> arch/arm64 tree.
> 
> The annoying part was:
> - Have build errors in objtool
> - Fix them
> - Objtool build succeeds, but have warning about outdated headers
> - Update headers
> - New errors come up, potentially making obsolete the ealier fixes

Ah right, yes.
 
> So it's not really a "must have" change. But it's nice to have when bringing
> new kernel headers to objtool.

No, I think it is useful.

> I hope this makes things clearer.

Yes, it does.

Thanks
Miroslav