Another Linus Rant About Linux DRM; Rejects Pull
Linus Torvalds is known to make a few colorful remarks from time to time. Today he's become frustrated once again with the Linux DRM layer and has rejected a pull request for the Linux 3.2 kernel.
David Airlie had sent in a pull request today for the Linux 3.2 kernel that addresses an Intel VT-d issue with Ironlake graphics, a kexec fix where the GPU write-back engines need to be switched off, and then a trivial Radeon KMS fix. The kexec fix sent Linus over the edge.
In the past Linus Torvalds has been vocal about select Direct Rendering Manager (DRM) pull requests from David Airlie with calling the GEM memory management patches at first being untested crap, the lack of Nouveau DRM in the Linux kernel, questioning what's wrong with the whole DRM crowd, and showing why DRM has been problematic (late pull request), among other remarks.
Below is the response from Linus Torvalds for Airlie's pull request.
Quite frankly, I think it's too late for something like a kexec bugfix. Nobody cares. So kexec doesn't work - that's not something new. This doesn't smell like a regression to me. And the kcalloc things you mention *sound* like some kind of cleanup crap.
As it's not exactly a popular end-user Linux feature, for those that don't known, kexec allows a new kernel to be booted and switched to from an existing running Linux kernel without a full system reboot. Using kexec skips over the BIOS/UEFI hardware initialization -- this allows for a faster switch to a new kernel and other niche cases (e.g. there's a way to re-clock with the NVIDIA binary blob and then switching over to Nouveau, etc).
After Airlie replied to Linus, there was a soft response from Torvalds where he clarified his position.
So having looked at the patch itself, I don't dislike the notion of making sure certain fields are nicely initialized. So I don't hate the patch itself, but quite frankly, to me it doesn't smell even *remotely* like "regression fix". I don't think this is something that has ever worked.
Linus is basically wanting to reserve the post merge window now for "real" regression fixes and new hardware enablement, at least for the DRM subsystem.
The thread can be found on LKML.org for those wanting to read in full or check for updates.
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