Changelog of features / drivers removed from kernel?
Apologies if this comes off as a lazy question, but after a fair bit of searching I've been unable to find a changelog indicating which device drivers / features were dropped from various versions of the kernel. Does such a changelog exist? I'm specifically trying to narrow down why the PCI devices on a server I have work with 5.8 and don't work with 5.9+. The server is circa 2014, so I suppose there's an off chance support for some component got dropped. Thanks in advance, Evan -- Evan Mesterhazy etm2131@columbia.edu
On Sun, Feb 07, 2021 at 05:30:34PM -0500, Evan T Mesterhazy wrote:
Apologies if this comes off as a lazy question, but after a fair bit of searching I've been unable to find a changelog indicating which device drivers / features were dropped from various versions of the kernel. Does such a changelog exist?
`git log v5.1..v5.2` will show you the whole log, but that's a lot.
I'm specifically trying to narrow down why the PCI devices on a server I have work with 5.8 and don't work with 5.9+. The server is circa 2014, so I suppose there's an off chance support for some component got dropped.
I doubt support for such modern hardware has been dropped in kernel versions like this. Odds are you just forgot to update a configuration option. Try using `git bisect` to track down the offending commit, that will go much faster. good luck! greg k-h
Thanks, Greg - good suggestion regarding `git bisect`. I was able to narrow it down to a change between 5.8 and 5.9, so maybe that's the next logical thing to do. None of the config options added between those releases seemed relevant to the issue, but perhaps one of them is and I just don't realize it. - Evan On Mon, Feb 8, 2021 at 1:52 AM Greg KH <greg@kroah.com> wrote:
On Sun, Feb 07, 2021 at 05:30:34PM -0500, Evan T Mesterhazy wrote:
Apologies if this comes off as a lazy question, but after a fair bit of searching I've been unable to find a changelog indicating which device drivers / features were dropped from various versions of the kernel. Does such a changelog exist?
`git log v5.1..v5.2` will show you the whole log, but that's a lot.
I'm specifically trying to narrow down why the PCI devices on a server I have work with 5.8 and don't work with 5.9+. The server is circa 2014, so I suppose there's an off chance support for some component got dropped.
I doubt support for such modern hardware has been dropped in kernel versions like this. Odds are you just forgot to update a configuration option.
Try using `git bisect` to track down the offending commit, that will go much faster.
good luck!
greg k-h
-- Evan Mesterhazy etm2131@columbia.edu
On Mon, 08 Feb 2021 09:00:27 -0500, Evan T Mesterhazy said:
Thanks, Greg - good suggestion regarding `git bisect`. I was able to narrow it down to a change between 5.8 and 5.9, so maybe that's the next logical thing to do. None of the config options added between those releases seemed relevant to the issue, but perhaps one of them is and I just don't realize it.
You're probably looking for a config option that was *removed* between those releases.
It turns out, after building 14 different commits between v5.8 and v5.9, that a three line change in drivers/pci/controller/pci-xgene.c breaks PCI on this machine. If I revert this file and build the commit that changed it, PCI works properly. No config options changed between these commits. I suppose now it's just a matter of figuring out why this change breaks it, and how it can be fixed and applied to 5.9+. On Tue, Feb 9, 2021 at 4:03 AM Valdis Klētnieks <valdis.kletnieks@vt.edu> wrote:
On Mon, 08 Feb 2021 09:00:27 -0500, Evan T Mesterhazy said:
Thanks, Greg - good suggestion regarding `git bisect`. I was able to narrow it down to a change between 5.8 and 5.9, so maybe that's the next logical thing to do. None of the config options added between those releases seemed relevant to the issue, but perhaps one of them is and I just don't realize it.
You're probably looking for a config option that was *removed* between those releases.
-- Evan Mesterhazy etm2131@columbia.edu
On Tue, Feb 09, 2021 at 09:44:03AM -0500, Evan T Mesterhazy wrote:
It turns out, after building 14 different commits between v5.8 and v5.9, that a three line change in drivers/pci/controller/pci-xgene.c breaks PCI on this machine. If I revert this file and build the commit that changed it, PCI works properly. No config options changed between these commits.
I suppose now it's just a matter of figuring out why this change breaks it, and how it can be fixed and applied to 5.9+.
Please let the upstream developers of that change, and the mailing list associated with it, know about this regression so they can help you out in resolving it. thanks, greg k-h
participants (3)
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Evan T Mesterhazy -
Greg KH -
Valdis Klētnieks