Linux project lead Linus Torvalds has said it is not easy to become a major contributor to the Linux kernel. In an email interview with ZDNet.com.au sister site ZDNet.co.uk last week, Torvalds said that, while it was relatively easy for coders and organisations to contribute small patches, the contribution of large patches, developed in isolation, could lead to both new and established contributors becoming frustrated. "The kernel is about pretty harsh technical issues, and mistakes are really frowned upon," wrote Torvalds. "In an OS kernel, there are simply more security and stability requirements, and the bar is really higher in some respects. That will inevitably also reflect in the response to patches."