My first contribution was a micro-optimisation to the Linux kernel, I was fairly new to git and was a beginner in kernel development. Unfortunately it caused a bit of fuss, it was one of the most talked about threads that month, but not because it was ground breaking. In the end Linus Torvalds responded and got it merged. Learnt a lot in the process:
Holy crap, that's so awesome. The Linux kernal to me is probably the most intimidating thing I could think of when considering what to contribute to. I can't believe your first pull request ever was merged and you got a response from Linus himself.
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