Hi Greg, On 21 Jan 2022, at 15:51, Greg KH wrote: > On Thu, Jan 20, 2022 at 06:10:31PM +0800, Tianrui Wei wrote: >> Hi, >> >> I was wondering if there're any tools/scripts in Linux that'd help me >> to convert legacy kernel modules for using on a modern Linux (Kernel > >> 5.0) system? > > It depends on the driver you wish to convert. For wireless drivers, > there was the "linux backport project" that provided scripts and tools > to do this type of work. For other subsystems, I do not think anyone > ever did so as it's both not that hard, and also very specific to the > code that you are trying to convert. Thanks for telling me about the Linux back port project. It does seem very interesting. > >> If there're not out of box solutions, is there a way I could view the >> API changes in every subsystem clearly? For example, this particular >> commit[^1] shows the second return argument is being removed from >> ki_complete, and it took a lot of fishing down the lkml to do. Perhaps >> there is a simpler way? > > Use git itself to track the changes in apis. You can see all changes to > a .h file by doing: > git log -p path/to/file > and then see where the api got changed. This is a really good suggestion, and it's also the way I approach recent kernel modules. However some specifically ancient kernel modules is rather difficult to use this approach. > > It usually isn't that difficult to forward port a driver, but it all > depends on the age of the code, and what it actually does. Do you have > a link to the code you wish to drag forward? The specific driver I had in mind is a PCIE driver for a Xilinx IP block. It's under https://www.xilinx.com/products/boards-and-kits/ek-k7-kc705-g.html#resources in a zip folder called rdf0281-kc705-base-trd-2014-3.zip. Everyone with a xilinx account could download the folder. Unfortunately its header claims it contains confidential information from Xilinx, as such I'm a bit wary to post it online. > You can also always add it to the in-kernel drivers/staging/ area and have others help out with this effort. Thanks for giving me information about the drivers/staging area! I'll try to upstream my future work there. > > good luck! > > greg k-h Best Regards, Tianrui
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