stable/for-linus-3.7-rc4-tag

Bug-fixes:
 * Use appropriate macros instead of hand-rolling our own (ARM).
 * Fixes if FB/KBD closed unexpectedly.
 * Fix memory leak in /dev/gntdev ioctl calls.
 * Fix overflow check in xenbus_file_write.
 * Document cleanup.
 * Performance optimization when migrating guests.
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