Linux 3.19 rc4

Another week, another -rc.Things have remained reasonably calm, although we also had a fewlast-minute MM regressions. Happily, most of them got fixed reallyquickly, with one remaining arm64 issue still pending.So go forth and test some more. I'll be traveling for the next twoweeks due to LCA, but I should have internet, and if things continueto be reasonably calm I don't think that my travel should be all thatnoticeable.  Finally the timing worked out, unlike several releaseslast year.Anyway, the appended shortlog gives the details, but apart from thekgdb patches showing up as some uncommon work under kernel/debug/,things look fairly normal: mostly driver updates (gpu, pinctrl, hid,networking), architecture updates (mainly x86 this time, some minorarm[64] stuff), and some tooling fixes (mainly perf).              Linus