[linux-dvb] RFC: remove support from v4l-dvb for kernels < 2.6.16

Oliver Endriss o.endriss at gmx.de
Sun Jul 6 03:58:40 CEST 2008

Hans Verkuil wrote:
> RFC: remove support from v4l-dvb for kernels < 2.6.16
> After spending some time trying to get v4l-dvb to compile on older 
> kernels I discovered that:
> - it is OK for kernels >= 2.6.19
> - it does not compile at the moment for kernels >= 2.6.16 and < 2.6.19, 
> but that this can be fixed.
> - that it can be made to compile for kernels >= 2.6.12 and < 2.6.16, 
> although quite a few drivers had to be disabled and looking at the type 
> of compile warnings emitted the result would likely crash, especially 
> the closer one gets to 2.6.12.
> - that I no longer can compile against older kernels since gcc-4.1.2 no 
> longer accepts some constructions used in those kernel sources.
> I propose that we remove the support for kernels < 2.6.16. Kernel 2.6.16 
> is the kernel that's being maintained long-term, so that makes it a 
> good starting point. I know that I get the occasional question about 
> kernel 2v4l/em28xx-audio.c.6.18, so that definitely has to be supported 
> by v4l-dvb, and the differences between 2.6.18 and 2.6.16 are minor, so 
> extending the support to 2.6.16 is not a problem.
> I did a few scans and of the approximately 932 KERNEL_VERSION checks 
> only 268 remain if we drop support for anything below 2.6.26. That's a 
> major cleanup.
> Since it is now simply broken for anything below 2.6.19 I think it is a 
> good solution to on the one hand do a major cleanup at the expense of 
> making it unlikely that we will ever support kernels below 2.6.16, and 
> on the other hand at least start to support 2.6.16 and up.
> I can set up a test build to periodically test if v4l-dvb still compiles 
> on these older kernels (although currently I can only test on a 32 bit 
> Intel platform).
> I'm also willing to do the clean up (I've always liked throwing away 
> code!).
> In the long term we should probably review the minimum kernel 
> requirements on a yearly basis and see if we should move it up. 
> Especially major changes in the way the kernel handles device structs 
> can be a big pain to maintain. That's currently the main reason for the 
> breakage of kernels < 2.6.19.
> Regards,
> 	Hans Verkuil

Ack, I second that.


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