Re: [PATCH 5/9] objtool: Rework rebuild_reloc logic

[Peter Zijlstra]

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.

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