Merge 4.4.109 into android-4.4

Changes in 4.4.109
	ACPI: APEI / ERST: Fix missing error handling in erst_reader()
	crypto: mcryptd - protect the per-CPU queue with a lock
	mfd: cros ec: spi: Don't send first message too soon
	mfd: twl4030-audio: Fix sibling-node lookup
	mfd: twl6040: Fix child-node lookup
	ALSA: rawmidi: Avoid racy info ioctl via ctl device
	ALSA: usb-audio: Fix the missing ctl name suffix at parsing SU
	PCI / PM: Force devices to D0 in pci_pm_thaw_noirq()
	parisc: Hide Diva-built-in serial aux and graphics card
	spi: xilinx: Detect stall with Unknown commands
	KVM: X86: Fix load RFLAGS w/o the fixed bit
	kvm: x86: fix RSM when PCID is non-zero
	powerpc/perf: Dereference BHRB entries safely
	net: mvneta: clear interface link status on port disable
	tracing: Remove extra zeroing out of the ring buffer page
	tracing: Fix possible double free on failure of allocating trace buffer
	tracing: Fix crash when it fails to alloc ring buffer
	ring-buffer: Mask out the info bits when returning buffer page length
	iw_cxgb4: Only validate the MSN for successful completions
	ASoC: fsl_ssi: AC'97 ops need regmap, clock and cleaning up on failure
	ASoC: twl4030: fix child-node lookup
	ALSA: hda: Drop useless WARN_ON()
	ALSA: hda - fix headset mic detection issue on a Dell machine
	x86/vm86/32: Switch to flush_tlb_mm_range() in mark_screen_rdonly()
	x86/mm: Remove flush_tlb() and flush_tlb_current_task()
	x86/mm: Make flush_tlb_mm_range() more predictable
	x86/mm: Reimplement flush_tlb_page() using flush_tlb_mm_range()
	x86/mm: Remove the UP asm/tlbflush.h code, always use the (formerly) SMP code
	x86/mm: Disable PCID on 32-bit kernels
	x86/mm: Add the 'nopcid' boot option to turn off PCID
	x86/mm: Enable CR4.PCIDE on supported systems
	x86/mm/64: Fix reboot interaction with CR4.PCIDE
	kbuild: add '-fno-stack-check' to kernel build options
	ipv4: igmp: guard against silly MTU values
	ipv6: mcast: better catch silly mtu values
	net: igmp: Use correct source address on IGMPv3 reports
	netlink: Add netns check on taps
	net: qmi_wwan: add Sierra EM7565 1199:9091
	net: reevalulate autoflowlabel setting after sysctl setting
	tcp md5sig: Use skb's saddr when replying to an incoming segment
	tg3: Fix rx hang on MTU change with 5717/5719
	net: ipv4: fix for a race condition in raw_sendmsg
	net: mvmdio: disable/unprepare clocks in EPROBE_DEFER case
	sctp: Replace use of sockets_allocated with specified macro.
	ipv4: Fix use-after-free when flushing FIB tables
	net: bridge: fix early call to br_stp_change_bridge_id and plug newlink leaks
	net: Fix double free and memory corruption in get_net_ns_by_id()
	net: phy: micrel: ksz9031: reconfigure autoneg after phy autoneg workaround
	sock: free skb in skb_complete_tx_timestamp on error
	usbip: fix usbip bind writing random string after command in match_busid
	usbip: stub: stop printing kernel pointer addresses in messages
	usbip: vhci: stop printing kernel pointer addresses in messages
	USB: serial: ftdi_sio: add id for Airbus DS P8GR
	USB: serial: qcserial: add Sierra Wireless EM7565
	USB: serial: option: add support for Telit ME910 PID 0x1101
	USB: serial: option: adding support for YUGA CLM920-NC5
	usb: Add device quirk for Logitech HD Pro Webcam C925e
	usb: add RESET_RESUME for ELSA MicroLink 56K
	USB: Fix off by one in type-specific length check of BOS SSP capability
	usb: xhci: Add XHCI_TRUST_TX_LENGTH for Renesas uPD720201
	nohz: Prevent a timer interrupt storm in tick_nohz_stop_sched_tick()
	x86/smpboot: Remove stale TLB flush invocations
	n_tty: fix EXTPROC vs ICANON interaction with TIOCINQ (aka FIONREAD)
	mm/vmstat: Make NR_TLB_REMOTE_FLUSH_RECEIVED available even on UP
	Linux 4.4.109

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

1 files changed, 9 insertions, 64 deletions

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 45ba87466e6a..7a4cdb632508 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -15,7 +15,7 @@
 #include <linux/debugfs.h>
 
 /*
- *	Smarter SMP flushing macros.
+ *	TLB flushing, formerly SMP-only
  *		c/o Linus Torvalds.
  *
  *	These mean you can really definitely utterly forget about
@@ -28,8 +28,6 @@
  *	Implement flush IPI by CALL_FUNCTION_VECTOR, Alex Shi
  */
 
-#ifdef CONFIG_SMP
-
 struct flush_tlb_info {
 	struct mm_struct *flush_mm;
 	unsigned long flush_start;
@@ -59,8 +57,6 @@ void leave_mm(int cpu)
 }
 EXPORT_SYMBOL_GPL(leave_mm);
 
-#endif /* CONFIG_SMP */
-
 void switch_mm(struct mm_struct *prev, struct mm_struct *next,
 	       struct task_struct *tsk)
 {
@@ -77,10 +73,8 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
 	unsigned cpu = smp_processor_id();
 
 	if (likely(prev != next)) {
-#ifdef CONFIG_SMP
 		this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
 		this_cpu_write(cpu_tlbstate.active_mm, next);
-#endif
 		cpumask_set_cpu(cpu, mm_cpumask(next));
 
 		/*
@@ -137,9 +131,7 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
 		if (unlikely(prev->context.ldt != next->context.ldt))
 			load_mm_ldt(next);
 #endif
-	}
-#ifdef CONFIG_SMP
-	  else {
+	} else {
 		this_cpu_write(cpu_tlbstate.state, TLBSTATE_OK);
 		BUG_ON(this_cpu_read(cpu_tlbstate.active_mm) != next);
 
@@ -166,11 +158,8 @@ void switch_mm_irqs_off(struct mm_struct *prev, struct mm_struct *next,
 			load_mm_ldt(next);
 		}
 	}
-#endif
 }
 
-#ifdef CONFIG_SMP
-
 /*
  * The flush IPI assumes that a thread switch happens in this order:
  * [cpu0: the cpu that switches]
@@ -272,23 +261,6 @@ void native_flush_tlb_others(const struct cpumask *cpumask,
 	smp_call_function_many(cpumask, flush_tlb_func, &info, 1);
 }
 
-void flush_tlb_current_task(void)
-{
-	struct mm_struct *mm = current->mm;
-
-	preempt_disable();
-
-	count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
-
-	/* This is an implicit full barrier that synchronizes with switch_mm. */
-	local_flush_tlb();
-
-	trace_tlb_flush(TLB_LOCAL_SHOOTDOWN, TLB_FLUSH_ALL);
-	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
-		flush_tlb_others(mm_cpumask(mm), mm, 0UL, TLB_FLUSH_ALL);
-	preempt_enable();
-}
-
 /*
  * See Documentation/x86/tlb.txt for details.  We choose 33
  * because it is large enough to cover the vast majority (at
@@ -309,6 +281,12 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 	unsigned long base_pages_to_flush = TLB_FLUSH_ALL;
 
 	preempt_disable();
+
+	if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB))
+		base_pages_to_flush = (end - start) >> PAGE_SHIFT;
+	if (base_pages_to_flush > tlb_single_page_flush_ceiling)
+		base_pages_to_flush = TLB_FLUSH_ALL;
+
 	if (current->active_mm != mm) {
 		/* Synchronize with switch_mm. */
 		smp_mb();
@@ -325,15 +303,11 @@ void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
 		goto out;
 	}
 
-	if ((end != TLB_FLUSH_ALL) && !(vmflag & VM_HUGETLB))
-		base_pages_to_flush = (end - start) >> PAGE_SHIFT;
-
 	/*
 	 * Both branches below are implicit full barriers (MOV to CR or
 	 * INVLPG) that synchronize with switch_mm.
 	 */
-	if (base_pages_to_flush > tlb_single_page_flush_ceiling) {
-		base_pages_to_flush = TLB_FLUSH_ALL;
+	if (base_pages_to_flush == TLB_FLUSH_ALL) {
 		count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
 		local_flush_tlb();
 	} else {
@@ -354,33 +328,6 @@ out:
 	preempt_enable();
 }
 
-void flush_tlb_page(struct vm_area_struct *vma, unsigned long start)
-{
-	struct mm_struct *mm = vma->vm_mm;
-
-	preempt_disable();
-
-	if (current->active_mm == mm) {
-		if (current->mm) {
-			/*
-			 * Implicit full barrier (INVLPG) that synchronizes
-			 * with switch_mm.
-			 */
-			__flush_tlb_one(start);
-		} else {
-			leave_mm(smp_processor_id());
-
-			/* Synchronize with switch_mm. */
-			smp_mb();
-		}
-	}
-
-	if (cpumask_any_but(mm_cpumask(mm), smp_processor_id()) < nr_cpu_ids)
-		flush_tlb_others(mm_cpumask(mm), mm, start, start + PAGE_SIZE);
-
-	preempt_enable();
-}
-
 static void do_flush_tlb_all(void *info)
 {
 	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH_RECEIVED);
@@ -465,5 +412,3 @@ static int __init create_tlb_single_page_flush_ceiling(void)
 	return 0;
 }
 late_initcall(create_tlb_single_page_flush_ceiling);
-
-#endif /* CONFIG_SMP */