Re: [PATCH v2] perf tools: fix off-by-one error in maps

From: Arnaldo Carvalho de Melo
Date: Tue Oct 14 2014 - 15:24:48 EST

Em Tue, Oct 14, 2014 at 09:03:02PM +0200, Stephane Eranian escreveu:
> On Tue, Oct 14, 2014 at 8:58 PM, Arnaldo Carvalho de Melo
> > struct vm_area_struct {
> > /* The first cache line has the info for VMA tree walking. */

> > unsigned long vm_start; /* Our start address within vm_mm. */
> > unsigned long vm_end; /* The first byte after our end address
> > within vm_mm. */

> > So these guys have been doing this far longer than me, I guess I'll bow
> > to this convention.

> > But by renaming map->end to map->end_ and looking at all the usage of
> > it, there are some inconsistencies...

> > Like symbol->{start,end} is of the [start,end] case, and to be
> > consistent with above needs to also move to [start,end[, will cook a
> > patch and send for review.

> Yes, there were some inconsistencies (or confusions) that I noticed when
> I started fixing the maps. I can believe that this off-by-one error exist with
> other data types. That could cause wrong symbol correlations in borderline
> cases (which are really rare).

Yeah, I'll try and fix one by one in separate patches when applicable.

- Arnaldo
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