Take a look at a recent snapshot of changesets and lines of code to the Linux kernel contributed by various employers: https://lwn.net/Articles/816162/
Arm themselves is listed at 1.8% by changesets; but Linaro is a software development shop funded by Arm and other Arm licensees to work on Arm support in various free software, and they contributed 4% of changesets and 8.8% by lines of code. And Code Aurora Forum is an effort to help various hardware vendors, many of whom are Arm vendors, get drivers upstreamed, and they contributed 1.8% by changesets and 10.1% by lines changed. A number of other top companies listed are also Arm licensees, though their support may be for random drivers or other CPU architectures as well.
However, Arm and companies in the Arm ecosystem do make up a fairly large amount of the code contributed to Linux, even if much of it is just drivers for random hardware.
And Arm and Linaro developers also contribute to GCC, LLVM, Rust, and more.
Take a look at a recent snapshot of changesets and lines of code to the Linux kernel contributed by various employers: https://lwn.net/Articles/816162/
Arm themselves is listed at 1.8% by changesets; but Linaro is a software development shop funded by Arm and other Arm licensees to work on Arm support in various free software, and they contributed 4% of changesets and 8.8% by lines of code. And Code Aurora Forum is an effort to help various hardware vendors, many of whom are Arm vendors, get drivers upstreamed, and they contributed 1.8% by changesets and 10.1% by lines changed. A number of other top companies listed are also Arm licensees, though their support may be for random drivers or other CPU architectures as well.
However, Arm and companies in the Arm ecosystem do make up a fairly large amount of the code contributed to Linux, even if much of it is just drivers for random hardware.
And Arm and Linaro developers also contribute to GCC, LLVM, Rust, and more.