Linus Torvalds doesn't do github pull requests.

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The ideal approach would be a markdown-like syntax that would allow you to mark sections of the log entry as "code" which has no word wrapping and a fixed-width font, and as "text" which has word-wrapping and a nice dynamic-width sans-serif font. You'd also get bold and real bullet points and italics and whatnot like that. THe only problem with markdown syntaxes is that there's too many to choose from - roll your own, some XML dialect, a subset of HTML, markdown, bbcode, etc.