Merge 4.19.172 into android-4.19-stable

Changes in 4.19.172
	gpio: mvebu: fix pwm .get_state period calculation
	Revert "mm/slub: fix a memory leak in sysfs_slab_add()"
	futex: Move futex exit handling into futex code
	futex: Replace PF_EXITPIDONE with a state
	exit/exec: Seperate mm_release()
	futex: Split futex_mm_release() for exit/exec
	futex: Set task::futex_state to DEAD right after handling futex exit
	futex: Mark the begin of futex exit explicitly
	futex: Sanitize exit state handling
	futex: Provide state handling for exec() as well
	futex: Add mutex around futex exit
	futex: Provide distinct return value when owner is exiting
	futex: Prevent exit livelock
	futex: Ensure the correct return value from futex_lock_pi()
	futex: Replace pointless printk in fixup_owner()
	futex: Provide and use pi_state_update_owner()
	rtmutex: Remove unused argument from rt_mutex_proxy_unlock()
	futex: Use pi_state_update_owner() in put_pi_state()
	futex: Simplify fixup_pi_state_owner()
	futex: Handle faults correctly for PI futexes
	HID: wacom: Correct NULL dereference on AES pen proximity
	tracing: Fix race in trace_open and buffer resize call
	tools: Factor HOSTCC, HOSTLD, HOSTAR definitions
	dm integrity: conditionally disable "recalculate" feature
	writeback: Drop I_DIRTY_TIME_EXPIRE
	fs: fix lazytime expiration handling in __writeback_single_inode()
	Linux 4.19.172

Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I9b5391e9e955a105ab9c144fa6258dcbea234211