linux-kernel - Re: [PATCH 5/9] objtool: Rework rebuild

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Message-ID: <20210318004917.sytcivxy5h2ujttc@treble>
Date:   Wed, 17 Mar 2021 19:49:17 -0500
From:   Josh Poimboeuf <jpoimboe@...hat.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     x86@...nel.org, jgross@...e.com, mbenes@...e.cz,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/9] objtool: Rework rebuild_reloc logic

On Wed, Mar 17, 2021 at 09:12:15AM +0100, Peter Zijlstra wrote:
> On Tue, Mar 16, 2021 at 10:34:17PM -0500, Josh Poimboeuf wrote:
> > On Fri, Mar 12, 2021 at 06:16:18PM +0100, Peter Zijlstra wrote:
> > > --- a/tools/objtool/elf.c
> > > +++ b/tools/objtool/elf.c
> > > @@ -479,6 +479,8 @@ void elf_add_reloc(struct elf *elf, stru
> > >  
> > >  	list_add_tail(&reloc->list, &sec->reloc_list);
> > >  	elf_hash_add(elf->reloc_hash, &reloc->hash, reloc_hash(reloc));
> > > +
> > > +	sec->rereloc = true;
> > >  }
> > 
> > Can we just reuse sec->changed for this?  Something like this on top
> > (untested of course):
> 
> I think my worry was that we'd dirty too much and slow down the write,
> but I haven't done any actual performance measurements on this.

Really?  I thought my proposal was purely aesthetic, no functional
change, but my brain is toasty this week due to other distractions so
who knows.

> Let me do a few runs and see if it matters at all.

-- 
Josh