stable/for-linus-3.7-rc2-tag

Bug-fixes:
 * Fix mysterious SIGSEGV or SIGKILL in applications due to corrupting
   of the %eip when returning from a signal handler.
 * Fix various ARM compile issues after the merge fallout.
 * Continue on making more of the Xen generic code usable by ARM platform.
 * Fix SR-IOV passthrough to mirror multifunction PCI devices.
 * Fix various compile warnings.
 * Remove hypercalls that don't exist anymore.
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