On Sun, 05 Aug 2007 14:24:06 -0500
Larry Finger <larry.finger@lwfinger.net> wrote:

quoted text
> Sean wrote:
> > On Sun, 05 Aug 2007 11:02:21 -0500
> > Larry Finger <Larry.Finger@lwfinger.net> wrote:
> > 
> >> I'm helping someone find what looks like a regression in bcm43xx-mac80211 between v2.6.22 and 
> >> v2.6.23-rc1. This driver is not in the mainstream kernel, but is found in John Linville's 
> >> wireless-dev git tree. When we do the first bisection between the current state and v2.6.22, we 
> >> obtain a kernel whose Makefile says it is v2.6.22; however, it's code is based on a state before 
> >> bcm43xx-mac80211 was introduced into this tree. My memory isn't what it used to be, but I think this 
> >> code was put into this tree during 2.6.19 or .20. When I used visualize to see the tree, the bottom 
> >> is all the way to v2.6.16, which I think is the origin of the git process.
> >>
> >> Is this a git bug, or is it some flaw in this particular tree? We have worked around the problem by 
> >> arbitrarily calling each bisection that does not have the bcm43xx-mac80211 code as "good". It has 
> >> been a source of confusion for the guy I'm helping as it is his first bisection. Unfortunately, the 
> >> bug doesn't show on my machine.
> >>
> The git repo is git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-dev.git.
> 
> The commands were:
> 
> git bisect start
> git bisect bad
> git bisect good v2.6.22
> 
> I'm using git version 1.4.4.2.g04509

The directory "drivers/net/wireless/bcm43xx-mac80211" is only introduced in
commit v2.6.23-rc1-1621-gd05daff.   It didn't exist in v2.6.22.

You can see this with the command:

  $ git log -- drivers/net/wireless/bcm43xx-mac80211

Where the last listed commit is d05daff.  So of course there will be many
bisection points back to v2.6.22 where that directory just doesn't exist.
A bit of digging with Git shows this history for most of the files in
that directory:

  renamed in v2.6.23-rc1-1621 as bcm43xx-mac80211
  renamed in v2.6.21-rc1-809 as mac80211
  renamed in v2.6.17-rc2-357 as d80211/bcm43xx
 Imported in v2.6.16-1725 as bcm43xx-d80211

HTH,
Sean
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