Re: identical hashes on two branches, but holes in git log

> On Wed, May 20, 2015 at 03:13:59PM +0200, Philippe De Muyter wrote:
> > My initial problem (still unresolved/unanswered) is that some commits
> > that appeared between v3.14-rc1 and v3.14-rc2 (specifically
> > 817c27a128e18aed840adc295f988e1656fed7d1) are present in v3.15, but not
> > in my branch.
> > 
> > I have just checked online the v3.14 version on 
> > 
> > http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/log/arch/arm/boot/dts/imx6qdl.dtsi 
> > 
> > and I see also the same "problem": the commit removing 738 lines is in the log
> > 817c27a128e18aed840adc295f988e1656fed7d1
> > "ARM: dts: imx6qdl: make pinctrl nodes board specific",
> > but the v3.14 version of the file still contains the 738 removed line,
> > and I see no commit restoring those lines.
> > 
> > I do not understand why those 738 lines are still present in v3.14 although
> > they were removed between v3.14-rc1 and v3.14-rc2 :(
> 
> Commit 817c27a128e18aed840adc295f988e1656fed7d1 isn't in v3.14:
> 
> $ git describe --contains 817c27a128e18aed840adc295f988e1656fed7d1
> v3.15-rc1~77^2~40^2~57
> 
> $ git tag --contains 817c27a128e18aed840adc295f988e1656fed7d1
> v3.15
> v3.15-rc1
> v3.15-rc2
> v3.15-rc3
> v3.15-rc4
> v3.15-rc5
> v3.15-rc6
> v3.15-rc7
> v3.15-rc8
> v3.15.1
> v3.15.10
> v3.15.2
> [snip later tags]
> 
> However, the commit date of 817c27a128e18aed840adc295f988e1656fed7d1 is
> between the dates of v3.14-rc1 and v3.14-rc2 so the default commit
> ordering of `git log` will show it between those two tags.
> `--topo-order` may help but I suspect the history is too complex to
> infer the relationship between commits without `--graph`.