Merge 4.4.155 into android-4.4-p

Changes in 4.4.155
	net: 6lowpan: fix reserved space for single frames
	net: mac802154: tx: expand tailroom if necessary
	9p/net: Fix zero-copy path in the 9p virtio transport
	net: lan78xx: Fix misplaced tasklet_schedule() call
	spi: davinci: fix a NULL pointer dereference
	drm/i915/userptr: reject zero user_size
	powerpc/fadump: handle crash memory ranges array index overflow
	powerpc/pseries: Fix endianness while restoring of r3 in MCE handler.
	fs/9p/xattr.c: catch the error of p9_client_clunk when setting xattr failed
	9p/virtio: fix off-by-one error in sg list bounds check
	net/9p/client.c: version pointer uninitialized
	net/9p/trans_fd.c: fix race-condition by flushing workqueue before the kfree()
	x86/mm/pat: Fix L1TF stable backport for CPA, 2nd call
	dm cache metadata: save in-core policy_hint_size to on-disk superblock
	iio: ad9523: Fix displayed phase
	iio: ad9523: Fix return value for ad952x_store()
	vmw_balloon: fix inflation of 64-bit GFNs
	vmw_balloon: do not use 2MB without batching
	vmw_balloon: VMCI_DOORBELL_SET does not check status
	vmw_balloon: fix VMCI use when balloon built into kernel
	tracing: Do not call start/stop() functions when tracing_on does not change
	tracing/blktrace: Fix to allow setting same value
	kthread, tracing: Don't expose half-written comm when creating kthreads
	uprobes: Use synchronize_rcu() not synchronize_sched()
	9p: fix multiple NULL-pointer-dereferences
	PM / sleep: wakeup: Fix build error caused by missing SRCU support
	pnfs/blocklayout: off by one in bl_map_stripe()
	ARM: tegra: Fix Tegra30 Cardhu PCA954x reset
	mm/tlb: Remove tlb_remove_table() non-concurrent condition
	iommu/vt-d: Add definitions for PFSID
	iommu/vt-d: Fix dev iotlb pfsid use
	osf_getdomainname(): use copy_to_user()
	sys: don't hold uts_sem while accessing userspace memory
	userns: move user access out of the mutex
	ubifs: Fix memory leak in lprobs self-check
	Revert "UBIFS: Fix potential integer overflow in allocation"
	ubifs: Check data node size before truncate
	ubifs: Fix synced_i_size calculation for xattr inodes
	pwm: tiehrpwm: Fix disabling of output of PWMs
	fb: fix lost console when the user unplugs a USB adapter
	udlfb: set optimal write delay
	getxattr: use correct xattr length
	bcache: release dc->writeback_lock properly in bch_writeback_thread()
	perf auxtrace: Fix queue resize
	fs/quota: Fix spectre gadget in do_quotactl
	x86/io: add interface to reserve io memtype for a resource range. (v1.1)
	drm/drivers: add support for using the arch wc mapping API.
	Linux 4.4.155

Change-Id: I34f5e28013b2762737e5f0c08b20ae1d0a0f34c0
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/include/linux/io.h b/include/linux/io.h
index de64c1e53612..8ab45611fc35 100644
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -154,4 +154,26 @@ enum {
 void *memremap(resource_size_t offset, size_t size, unsigned long flags);
 void memunmap(void *addr);
 
+/*
+ * On x86 PAT systems we have memory tracking that keeps track of
+ * the allowed mappings on memory ranges. This tracking works for
+ * all the in-kernel mapping APIs (ioremap*), but where the user
+ * wishes to map a range from a physical device into user memory
+ * the tracking won't be updated. This API is to be used by
+ * drivers which remap physical device pages into userspace,
+ * and wants to make sure they are mapped WC and not UC.
+ */
+#ifndef arch_io_reserve_memtype_wc
+static inline int arch_io_reserve_memtype_wc(resource_size_t base,
+					     resource_size_t size)
+{
+	return 0;
+}
+
+static inline void arch_io_free_memtype_wc(resource_size_t base,
+					   resource_size_t size)
+{
+}
+#endif
+
 #endif /* _LINUX_IO_H */