fs: Add exFAT file system

Change-Id: I7b611a7290e13b382597b34e68f05c78e19c4895
exFAT: Update to v1.2.5

Change-Id: I6a43a674e5edc599b00a902247539b11569f4e6f
enable exfat
block: add a flag to identify PM request

Add a flag REQ_PM to identify the request is PM related, such requests
will not change the device request queue's runtime status. It is
intended to be used in driver's runtime PM callback, so that driver can
perform some IO to the device there with the queue's runtime status
unaffected. e.g. in SCSI disk's runtime suspend callback, the disk will
be put into stopped power state, and this require sending a command to
the device. Such command processing should not change the disk's runtime
status.

Change-Id: I522bbee6cc911cefeefba50517ebc283e2838918
Signed-off-by: Lin Ming <ming.m.lin@intel.com>
Signed-off-by: Aaron Lu <aaron.lu@intel.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Git-commit: 66311274691ec65972cad3626057fa8d00c146d8
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
[sthumma@codeaurora.org: resolve trival merge conflicts]
Signed-off-by: Sujit Reddy Thumma <sthumma@codeaurora.org>
Revert "block: add a flag to identify PM request"

This reverts commit cfa0fe5a558b594b21ecf152df33e4433eecdd7f.
Revert "mm: make is_vmalloc_addr work properly."

This reverts commit d560dd9a8fd200d119be3bb9d99f22b0f06eddb4

Change-Id: I610975d802b11c6c382c2c29f8e2394ce8acce2d
Signed-off-by: Shruthi Krishna <skrish@codeaurora.org>
Revert "Revert "mm: make is_vmalloc_addr work properly.""

This reverts commit 9c33eb3af1a7d8144b3de14af8de860258d06db6.