Merge 4.4.63 into android-4.4

Changes in 4.4.63:
	cgroup, kthread: close race window where new kthreads can be migrated to non-root cgroups
	thp: fix MADV_DONTNEED vs clear soft dirty race
	drm/nouveau/mpeg: mthd returns true on success now
	drm/nouveau/mmu/nv4a: use nv04 mmu rather than the nv44 one
	CIFS: store results of cifs_reopen_file to avoid infinite wait
	Input: xpad - add support for Razer Wildcat gamepad
	perf/x86: Avoid exposing wrong/stale data in intel_pmu_lbr_read_32()
	x86/vdso: Ensure vdso32_enabled gets set to valid values only
	x86/vdso: Plug race between mapping and ELF header setup
	acpi, nfit, libnvdimm: fix interleave set cookie calculation (64-bit comparison)
	iscsi-target: Fix TMR reference leak during session shutdown
	iscsi-target: Drop work-around for legacy GlobalSAN initiator
	scsi: sr: Sanity check returned mode data
	scsi: sd: Consider max_xfer_blocks if opt_xfer_blocks is unusable
	scsi: sd: Fix capacity calculation with 32-bit sector_t
	xen, fbfront: fix connecting to backend
	libnvdimm: fix reconfig_mutex, mmap_sem, and jbd2_handle lockdep splat
	irqchip/irq-imx-gpcv2: Fix spinlock initialization
	ftrace: Fix removing of second function probe
	char: Drop bogus dependency of DEVPORT on !M68K
	char: lack of bool string made CONFIG_DEVPORT always on
	Revert "MIPS: Lantiq: Fix cascaded IRQ setup"
	kvm: fix page struct leak in handle_vmon
	zram: do not use copy_page with non-page aligned address
	powerpc: Disable HFSCR[TM] if TM is not supported
	crypto: ahash - Fix EINPROGRESS notification callback
	ath9k: fix NULL pointer dereference
	dvb-usb-v2: avoid use-after-free
	ext4: fix inode checksum calculation problem if i_extra_size is small
	platform/x86: acer-wmi: setup accelerometer when machine has appropriate notify event
	rtc: tegra: Implement clock handling
	mm: Tighten x86 /dev/mem with zeroing reads
	dvb-usb: don't use stack for firmware load
	dvb-usb-firmware: don't do DMA on stack
	virtio-console: avoid DMA from stack
	pegasus: Use heap buffers for all register access
	rtl8150: Use heap buffers for all register access
	catc: Combine failure cleanup code in catc_probe()
	catc: Use heap buffer for memory size test
	ibmveth: calculate gso_segs for large packets
	SUNRPC: fix refcounting problems with auth_gss messages.
	tty/serial: atmel: RS485 half duplex w/DMA: enable RX after TX is done
	net: ipv6: check route protocol when deleting routes
	sctp: deny peeloff operation on asocs with threads sleeping on it
	MIPS: fix Select HAVE_IRQ_EXIT_ON_IRQ_STACK patch.
	Linux 4.4.63

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

2 files changed, 25 insertions, 0 deletions

diff --git a/include/linux/cgroup.h b/include/linux/cgroup.h
index cb91b44f5f78..ad2bcf647b9a 100644
--- a/include/linux/cgroup.h
+++ b/include/linux/cgroup.h
@@ -528,6 +528,25 @@ static inline void pr_cont_cgroup_path(struct cgroup *cgrp)
 	pr_cont_kernfs_path(cgrp->kn);
 }
 
+static inline void cgroup_init_kthreadd(void)
+{
+	/*
+	 * kthreadd is inherited by all kthreads, keep it in the root so
+	 * that the new kthreads are guaranteed to stay in the root until
+	 * initialization is finished.
+	 */
+	current->no_cgroup_migration = 1;
+}
+
+static inline void cgroup_kthread_ready(void)
+{
+	/*
+	 * This kthread finished initialization.  The creator should have
+	 * set PF_NO_SETAFFINITY if this kthread should stay in the root.
+	 */
+	current->no_cgroup_migration = 0;
+}
+
 #else /* !CONFIG_CGROUPS */
 
 struct cgroup_subsys_state;
@@ -551,6 +570,8 @@ static inline void cgroup_free(struct task_struct *p) {}
 
 static inline int cgroup_init_early(void) { return 0; }
 static inline int cgroup_init(void) { return 0; }
+static inline void cgroup_init_kthreadd(void) {}
+static inline void cgroup_kthread_ready(void) {}
 
 #endif /* !CONFIG_CGROUPS */
 
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5b250c9f7718..79f70e5bae08 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1561,6 +1561,10 @@ struct task_struct {
 #ifdef CONFIG_COMPAT_BRK
 	unsigned brk_randomized:1;
 #endif
+#ifdef CONFIG_CGROUPS
+	/* disallow userland-initiated cgroup migration */
+	unsigned no_cgroup_migration:1;
+#endif
 
 	unsigned long atomic_flags; /* Flags needing atomic access. */