Kernel prepatch 4.2-rc1

Linus has released 4.2-rc1 and closed themerge window for this development cycle. As Linus explains, 4.2 may, inthe end, not end up being the development cycle with the most commits ever,but there is still a lot going on. "However, if you count the sizein pure number of lines changed, this really seems to be the biggest rcwe've ever had, with over a million lines added (and about a quartermillion removed). That beats the previous champion (3.11-rc1) that was hugemainly due to Lustre being added to the staging tree." The sourceof the biggest chunk of those new lines is the new amdgpu graphics driver.