Merge branch 'perf/core' into perf/probes

Resolved merge conflict in tools/perf/Makefile

Merge reason: we want to queue up a dependent patch.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

15 files changed, 92 insertions, 96 deletions

diff --git a/arch/mips/kernel/cevt-bcm1480.c b/arch/mips/kernel/cevt-bcm1480.c
index e02f79b1eb5..bfea327c636 100644
--- a/arch/mips/kernel/cevt-bcm1480.c
+++ b/arch/mips/kernel/cevt-bcm1480.c
@@ -144,7 +144,7 @@ void __cpuinit sb1480_clockevent_init(void)
 	bcm1480_unmask_irq(cpu, irq);
 
 	action->handler	= sibyte_counter_handler;
-	action->flags	= IRQF_DISABLED | IRQF_PERCPU;
+	action->flags	= IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER;
 	action->name	= name;
 	action->dev_id	= cd;
 
diff --git a/arch/mips/kernel/cevt-ds1287.c b/arch/mips/kernel/cevt-ds1287.c
index 6996da4d74a..00a4da277cb 100644
--- a/arch/mips/kernel/cevt-ds1287.c
+++ b/arch/mips/kernel/cevt-ds1287.c
@@ -107,7 +107,7 @@ static irqreturn_t ds1287_interrupt(int irq, void *dev_id)
 
 static struct irqaction ds1287_irqaction = {
 	.handler	= ds1287_interrupt,
-	.flags		= IRQF_DISABLED | IRQF_PERCPU,
+	.flags		= IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER,
 	.name		= "ds1287",
 };
 
diff --git a/arch/mips/kernel/cevt-gt641xx.c b/arch/mips/kernel/cevt-gt641xx.c
index 92351e00ae0..f5d265eb6ea 100644
--- a/arch/mips/kernel/cevt-gt641xx.c
+++ b/arch/mips/kernel/cevt-gt641xx.c
@@ -113,7 +113,7 @@ static irqreturn_t gt641xx_timer0_interrupt(int irq, void *dev_id)
 
 static struct irqaction gt641xx_timer0_irqaction = {
 	.handler	= gt641xx_timer0_interrupt,
-	.flags		= IRQF_DISABLED | IRQF_PERCPU,
+	.flags		= IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER,
 	.name		= "gt641xx_timer0",
 };
 
diff --git a/arch/mips/kernel/cevt-r4k.c b/arch/mips/kernel/cevt-r4k.c
index 2652362ce04..b469ad05d52 100644
--- a/arch/mips/kernel/cevt-r4k.c
+++ b/arch/mips/kernel/cevt-r4k.c
@@ -83,7 +83,7 @@ out:
 
 struct irqaction c0_compare_irqaction = {
 	.handler = c0_compare_interrupt,
-	.flags = IRQF_DISABLED | IRQF_PERCPU,
+	.flags = IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER,
 	.name = "timer",
 };
 
diff --git a/arch/mips/kernel/cevt-sb1250.c b/arch/mips/kernel/cevt-sb1250.c
index ac5903d1b20..da78eeaea6e 100644
--- a/arch/mips/kernel/cevt-sb1250.c
+++ b/arch/mips/kernel/cevt-sb1250.c
@@ -143,7 +143,7 @@ void __cpuinit sb1250_clockevent_init(void)
 	sb1250_unmask_irq(cpu, irq);
 
 	action->handler	= sibyte_counter_handler;
-	action->flags	= IRQF_DISABLED | IRQF_PERCPU;
+	action->flags	= IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER;
 	action->name	= name;
 	action->dev_id	= cd;
 
diff --git a/arch/mips/kernel/cevt-txx9.c b/arch/mips/kernel/cevt-txx9.c
index 0037f21baf0..218ee6bda93 100644
--- a/arch/mips/kernel/cevt-txx9.c
+++ b/arch/mips/kernel/cevt-txx9.c
@@ -146,7 +146,7 @@ static irqreturn_t txx9tmr_interrupt(int irq, void *dev_id)
 
 static struct irqaction txx9tmr_irq = {
 	.handler	= txx9tmr_interrupt,
-	.flags		= IRQF_DISABLED | IRQF_PERCPU,
+	.flags		= IRQF_DISABLED | IRQF_PERCPU | IRQF_TIMER,
 	.name		= "txx9tmr",
 	.dev_id		= &txx9_clock_event_device,
 };
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index f709657e4dc..7a51866068a 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -23,7 +23,7 @@
 #include <asm/mipsregs.h>
 #include <asm/system.h>
 #include <asm/watch.h>
-
+#include <asm/spram.h>
 /*
  * Not all of the MIPS CPUs have the "wait" instruction available. Moreover,
  * the implementation of the "wait" feature differs between CPU families. This
@@ -711,12 +711,6 @@ static void __cpuinit decode_configs(struct cpuinfo_mips *c)
 	mips_probe_watch_registers(c);
 }
 
-#ifdef CONFIG_CPU_MIPSR2
-extern void spram_config(void);
-#else
-static inline void spram_config(void) {}
-#endif
-
 static inline void cpu_probe_mips(struct cpuinfo_mips *c, unsigned int cpu)
 {
 	decode_configs(c);
diff --git a/arch/mips/kernel/head.S b/arch/mips/kernel/head.S
index 531ce7b1612..ea695d9605e 100644
--- a/arch/mips/kernel/head.S
+++ b/arch/mips/kernel/head.S
@@ -191,6 +191,7 @@ NESTED(kernel_entry, 16, sp)			# kernel entry point
 	/* Set the SP after an empty pt_regs.  */
 	PTR_LI		sp, _THREAD_SIZE - 32 - PT_SIZE
 	PTR_ADDU	sp, $28
+	back_to_back_c0_hazard
 	set_saved_sp	sp, t0, t1
 	PTR_SUBU	sp, 4 * SZREG		# init stack pointer
 
diff --git a/arch/mips/kernel/i8253.c b/arch/mips/kernel/i8253.c
index f7d8d5d0ddb..ed5c441615e 100644
--- a/arch/mips/kernel/i8253.c
+++ b/arch/mips/kernel/i8253.c
@@ -98,7 +98,7 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 
 static struct irqaction irq0  = {
 	.handler = timer_interrupt,
-	.flags = IRQF_DISABLED | IRQF_NOBALANCING,
+	.flags = IRQF_DISABLED | IRQF_NOBALANCING | IRQF_TIMER,
 	.name = "timer"
 };
 
diff --git a/arch/mips/kernel/irq-gic.c b/arch/mips/kernel/irq-gic.c
index d2072cd3859..b181f2f0ea8 100644
--- a/arch/mips/kernel/irq-gic.c
+++ b/arch/mips/kernel/irq-gic.c
@@ -14,38 +14,23 @@
 
 
 static unsigned long _gic_base;
-static unsigned int _irqbase, _mapsize, numvpes, numintrs;
-static struct gic_intr_map *_intrmap;
+static unsigned int _irqbase;
+static unsigned int gic_irq_flags[GIC_NUM_INTRS];
+#define GIC_IRQ_FLAG_EDGE      0x0001
 
-static struct gic_pcpu_mask pcpu_masks[NR_CPUS];
+struct gic_pcpu_mask pcpu_masks[NR_CPUS];
 static struct gic_pending_regs pending_regs[NR_CPUS];
 static struct gic_intrmask_regs intrmask_regs[NR_CPUS];
 
-#define gic_wedgeb2bok 0	/*
-				 * Can GIC handle b2b writes to wedge register?
-				 */
-#if gic_wedgeb2bok == 0
-static DEFINE_SPINLOCK(gic_wedgeb2b_lock);
-#endif
-
 void gic_send_ipi(unsigned int intr)
 {
-#if gic_wedgeb2bok == 0
-	unsigned long flags;
-#endif
 	pr_debug("CPU%d: %s status %08x\n", smp_processor_id(), __func__,
 		 read_c0_status());
-	if (!gic_wedgeb2bok)
-		spin_lock_irqsave(&gic_wedgeb2b_lock, flags);
 	GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), 0x80000000 | intr);
-	if (!gic_wedgeb2bok) {
-		(void) GIC_REG(SHARED, GIC_SH_CONFIG);
-		spin_unlock_irqrestore(&gic_wedgeb2b_lock, flags);
-	}
 }
 
 /* This is Malta specific and needs to be exported */
-static void vpe_local_setup(unsigned int numvpes)
+static void __init vpe_local_setup(unsigned int numvpes)
 {
 	int i;
 	unsigned long timer_interrupt = 5, perf_interrupt = 5;
@@ -105,44 +90,34 @@ unsigned int gic_get_int(void)
 
 static unsigned int gic_irq_startup(unsigned int irq)
 {
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	irq -= _irqbase;
-	GIC_SET_INTR_MASK(irq, 1);
+	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
+	GIC_SET_INTR_MASK(irq);
 	return 0;
 }
 
 static void gic_irq_ack(unsigned int irq)
 {
-#if gic_wedgeb2bok == 0
-	unsigned long flags;
-#endif
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	irq -= _irqbase;
-	GIC_CLR_INTR_MASK(irq, 1);
+	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
+	GIC_CLR_INTR_MASK(irq);
 
-	if (_intrmap[irq].trigtype == GIC_TRIG_EDGE) {
-		if (!gic_wedgeb2bok)
-			spin_lock_irqsave(&gic_wedgeb2b_lock, flags);
+	if (gic_irq_flags[irq] & GIC_IRQ_FLAG_EDGE)
 		GICWRITE(GIC_REG(SHARED, GIC_SH_WEDGE), irq);
-		if (!gic_wedgeb2bok) {
-			(void) GIC_REG(SHARED, GIC_SH_CONFIG);
-			spin_unlock_irqrestore(&gic_wedgeb2b_lock, flags);
-		}
-	}
 }
 
 static void gic_mask_irq(unsigned int irq)
 {
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	irq -= _irqbase;
-	GIC_CLR_INTR_MASK(irq, 1);
+	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
+	GIC_CLR_INTR_MASK(irq);
 }
 
 static void gic_unmask_irq(unsigned int irq)
 {
-	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
 	irq -= _irqbase;
-	GIC_SET_INTR_MASK(irq, 1);
+	pr_debug("CPU%d: %s: irq%d\n", smp_processor_id(), __func__, irq);
+	GIC_SET_INTR_MASK(irq);
 }
 
 #ifdef CONFIG_SMP
@@ -155,9 +130,8 @@ static int gic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 	unsigned long	flags;
 	int		i;
 
-	pr_debug(KERN_DEBUG "%s called\n", __func__);
 	irq -= _irqbase;
-
+	pr_debug(KERN_DEBUG "%s(%d) called\n", __func__, irq);
 	cpumask_and(&tmp, cpumask, cpu_online_mask);
 	if (cpus_empty(tmp))
 		return -1;
@@ -168,13 +142,6 @@ static int gic_set_affinity(unsigned int irq, const struct cpumask *cpumask)
 		/* Re-route this IRQ */
 		GIC_SH_MAP_TO_VPE_SMASK(irq, first_cpu(tmp));
 
-		/*
-		 * FIXME: assumption that _intrmap is ordered and has no holes
-		 */
-
-		/* Update the intr_map */
-		_intrmap[irq].cpunum = first_cpu(tmp);
-
 		/* Update the pcpu_masks */
 		for (i = 0; i < NR_CPUS; i++)
 			clear_bit(irq, pcpu_masks[i].pcpu_mask);
@@ -201,8 +168,9 @@ static struct irq_chip gic_irq_controller = {
 #endif
 };
 
-static void __init setup_intr(unsigned int intr, unsigned int cpu,
-	unsigned int pin, unsigned int polarity, unsigned int trigtype)
+static void __init gic_setup_intr(unsigned int intr, unsigned int cpu,
+	unsigned int pin, unsigned int polarity, unsigned int trigtype,
+	unsigned int flags)
 {
 	/* Setup Intr to Pin mapping */
 	if (pin & GIC_MAP_TO_NMI_MSK) {
@@ -227,38 +195,43 @@ static void __init setup_intr(unsigned int intr, unsigned int cpu,
 	GIC_SET_TRIGGER(intr, trigtype);
 
 	/* Init Intr Masks */
-	GIC_SET_INTR_MASK(intr, 0);
+	GIC_CLR_INTR_MASK(intr);
+	/* Initialise per-cpu Interrupt software masks */
+	if (flags & GIC_FLAG_IPI)
+		set_bit(intr, pcpu_masks[cpu].pcpu_mask);
+	if (flags & GIC_FLAG_TRANSPARENT)
+		GIC_SET_INTR_MASK(intr);
+	if (trigtype == GIC_TRIG_EDGE)
+		gic_irq_flags[intr] |= GIC_IRQ_FLAG_EDGE;
 }
 
-static void __init gic_basic_init(void)
+static void __init gic_basic_init(int numintrs, int numvpes,
+			struct gic_intr_map *intrmap, int mapsize)
 {
 	unsigned int i, cpu;
 
 	/* Setup defaults */
-	for (i = 0; i < GIC_NUM_INTRS; i++) {
+	for (i = 0; i < numintrs; i++) {
 		GIC_SET_POLARITY(i, GIC_POL_POS);
 		GIC_SET_TRIGGER(i, GIC_TRIG_LEVEL);
-		GIC_SET_INTR_MASK(i, 0);
+		GIC_CLR_INTR_MASK(i);
+		if (i < GIC_NUM_INTRS)
+			gic_irq_flags[i] = 0;
 	}
 
 	/* Setup specifics */
-	for (i = 0; i < _mapsize; i++) {
-		cpu = _intrmap[i].cpunum;
+	for (i = 0; i < mapsize; i++) {
+		cpu = intrmap[i].cpunum;
 		if (cpu == X)
 			continue;
-
-		if (cpu == 0 && i != 0 && _intrmap[i].intrnum == 0 &&
-					_intrmap[i].ipiflag == 0)
+		if (cpu == 0 && i != 0 && intrmap[i].flags == 0)
 			continue;
-
-		setup_intr(_intrmap[i].intrnum,
-				_intrmap[i].cpunum,
-				_intrmap[i].pin,
-				_intrmap[i].polarity,
-				_intrmap[i].trigtype);
-		/* Initialise per-cpu Interrupt software masks */
-		if (_intrmap[i].ipiflag)
-			set_bit(_intrmap[i].intrnum, pcpu_masks[cpu].pcpu_mask);
+		gic_setup_intr(i,
+			intrmap[i].cpunum,
+			intrmap[i].pin,
+			intrmap[i].polarity,
+			intrmap[i].trigtype,
+			intrmap[i].flags);
 	}
 
 	vpe_local_setup(numvpes);
@@ -273,12 +246,11 @@ void __init gic_init(unsigned long gic_base_addr,
 		     unsigned int irqbase)
 {
 	unsigned int gicconfig;
+	int numvpes, numintrs;
 
 	_gic_base = (unsigned long) ioremap_nocache(gic_base_addr,
 						    gic_addrspace_size);
 	_irqbase = irqbase;
-	_intrmap = intr_map;
-	_mapsize = intr_map_size;
 
 	GICREAD(GIC_REG(SHARED, GIC_SH_CONFIG), gicconfig);
 	numintrs = (gicconfig & GIC_SH_CONFIG_NUMINTRS_MSK) >>
@@ -290,5 +262,5 @@ void __init gic_init(unsigned long gic_base_addr,
 
 	pr_debug("%s called\n", __func__);
 
-	gic_basic_init();
+	gic_basic_init(numintrs, numvpes, intr_map, intr_map_size);
 }
diff --git a/arch/mips/kernel/linux32.c b/arch/mips/kernel/linux32.c
index 6242bc68add..b77fefaff9d 100644
--- a/arch/mips/kernel/linux32.c
+++ b/arch/mips/kernel/linux32.c
@@ -428,3 +428,9 @@ _sys32_clone(nabi_no_regargs struct pt_regs regs)
 	return do_fork(clone_flags, newsp, &regs, 0,
 	               parent_tidptr, child_tidptr);
 }
+
+asmlinkage long sys32_lookup_dcookie(u32 a0, u32 a1, char __user *buf,
+	size_t len)
+{
+	return sys_lookup_dcookie(merge_64(a0, a1), buf, len);
+}
diff --git a/arch/mips/kernel/scall64-o32.S b/arch/mips/kernel/scall64-o32.S
index 9bbf9775e0b..14dde4ca932 100644
--- a/arch/mips/kernel/scall64-o32.S
+++ b/arch/mips/kernel/scall64-o32.S
@@ -450,7 +450,7 @@ sys_call_table:
 	PTR	sys_io_submit
 	PTR	sys_io_cancel			/* 4245 */
 	PTR	sys_exit_group
-	PTR	sys_lookup_dcookie
+	PTR	sys32_lookup_dcookie
 	PTR	sys_epoll_create
 	PTR	sys_epoll_ctl
 	PTR	sys_epoll_wait			/* 4250 */
@@ -505,7 +505,7 @@ sys_call_table:
 	PTR	sys_fchmodat
 	PTR	sys_faccessat			/* 4300 */
 	PTR	compat_sys_pselect6
-	PTR	sys_ppoll
+	PTR	compat_sys_ppoll
 	PTR	sys_unshare
 	PTR	sys_splice
 	PTR	sys32_sync_file_range		/* 4305 */
diff --git a/arch/mips/kernel/smtc.c b/arch/mips/kernel/smtc.c
index 4d181df44a4..24630fd8ef6 100644
--- a/arch/mips/kernel/smtc.c
+++ b/arch/mips/kernel/smtc.c
@@ -75,7 +75,6 @@ unsigned long irq_hwmask[NR_IRQS];
 
 asiduse smtc_live_asid[MAX_SMTC_TLBS][MAX_SMTC_ASIDS];
 
-
 /*
  * Number of InterProcessor Interrupt (IPI) message buffers to allocate
  */
@@ -388,6 +387,7 @@ void smtc_prepare_cpus(int cpus)
 		IPIQ[i].head = IPIQ[i].tail = NULL;
 		spin_lock_init(&IPIQ[i].lock);
 		IPIQ[i].depth = 0;
+		IPIQ[i].resched_flag = 0; /* No reschedules queued initially */
 	}
 
 	/* cpu_data index starts at zero */
@@ -741,11 +741,24 @@ void smtc_forward_irq(unsigned int irq)
 static void smtc_ipi_qdump(void)
 {
 	int i;
+	struct smtc_ipi *temp;
 
 	for (i = 0; i < NR_CPUS ;i++) {
-		printk("IPIQ[%d]: head = 0x%x, tail = 0x%x, depth = %d\n",
+		pr_info("IPIQ[%d]: head = 0x%x, tail = 0x%x, depth = %d\n",
 			i, (unsigned)IPIQ[i].head, (unsigned)IPIQ[i].tail,
 			IPIQ[i].depth);
+		temp = IPIQ[i].head;
+
+		while (temp != IPIQ[i].tail) {
+			pr_debug("%d %d %d: ", temp->type, temp->dest,
+			       (int)temp->arg);
+#ifdef	SMTC_IPI_DEBUG
+		    pr_debug("%u %lu\n", temp->sender, temp->stamp);
+#else
+		    pr_debug("\n");
+#endif
+		    temp = temp->flink;
+		}
 	}
 }
 
@@ -784,11 +797,16 @@ void smtc_send_ipi(int cpu, int type, unsigned int action)
 	int mtflags;
 	unsigned long tcrestart;
 	extern void r4k_wait_irqoff(void), __pastwait(void);
+	int set_resched_flag = (type == LINUX_SMP_IPI &&
+				action == SMP_RESCHEDULE_YOURSELF);
 
 	if (cpu == smp_processor_id()) {
 		printk("Cannot Send IPI to self!\n");
 		return;
 	}
+	if (set_resched_flag && IPIQ[cpu].resched_flag != 0)
+		return; /* There is a reschedule queued already */
+
 	/* Set up a descriptor, to be delivered either promptly or queued */
 	pipi = smtc_ipi_dq(&freeIPIq);
 	if (pipi == NULL) {
@@ -801,6 +819,7 @@ void smtc_send_ipi(int cpu, int type, unsigned int action)
 	pipi->dest = cpu;
 	if (cpu_data[cpu].vpe_id != cpu_data[smp_processor_id()].vpe_id) {
 		/* If not on same VPE, enqueue and send cross-VPE interrupt */
+		IPIQ[cpu].resched_flag |= set_resched_flag;
 		smtc_ipi_nq(&IPIQ[cpu], pipi);
 		LOCK_CORE_PRA();
 		settc(cpu_data[cpu].tc_id);
@@ -847,6 +866,7 @@ void smtc_send_ipi(int cpu, int type, unsigned int action)
 			 */
 			write_tc_c0_tchalt(0);
 			UNLOCK_CORE_PRA();
+			IPIQ[cpu].resched_flag |= set_resched_flag;
 			smtc_ipi_nq(&IPIQ[cpu], pipi);
 		} else {
 postdirect:
@@ -996,12 +1016,15 @@ void deferred_smtc_ipi(void)
 		 * already enabled.
 		 */
 		local_irq_save(flags);
-
 		spin_lock(&q->lock);
 		pipi = __smtc_ipi_dq(q);
 		spin_unlock(&q->lock);
-		if (pipi != NULL)
+		if (pipi != NULL) {
+			if (pipi->type == LINUX_SMP_IPI &&
+			    (int)pipi->arg == SMP_RESCHEDULE_YOURSELF)
+				IPIQ[cpu].resched_flag = 0;
 			ipi_decode(pipi);
+		}
 		/*
 		 * The use of the __raw_local restore isn't
 		 * as obviously necessary here as in smtc_ipi_replay(),
@@ -1082,6 +1105,9 @@ static irqreturn_t ipi_interrupt(int irq, void *dev_idm)
 				 * with interrupts off
 				 */
 				local_irq_save(flags);
+				if (pipi->type == LINUX_SMP_IPI &&
+				    (int)pipi->arg == SMP_RESCHEDULE_YOURSELF)
+					IPIQ[cpu].resched_flag = 0;
 				ipi_decode(pipi);
 				local_irq_restore(flags);
 			}
diff --git a/arch/mips/kernel/spram.c b/arch/mips/kernel/spram.c
index 6ddb507a87e..1821d12a641 100644
--- a/arch/mips/kernel/spram.c
+++ b/arch/mips/kernel/spram.c
@@ -13,7 +13,6 @@
 #include <linux/ptrace.h>
 #include <linux/stddef.h>
 
-#include <asm/cpu.h>
 #include <asm/fpu.h>
 #include <asm/mipsregs.h>
 #include <asm/system.h>
@@ -198,8 +197,7 @@ static __cpuinit void probe_spram(char *type,
 		offset += 2 * SPRAM_TAG_STRIDE;
 	}
 }
-
-__cpuinit void spram_config(void)
+void __cpuinit spram_config(void)
 {
 	struct cpuinfo_mips *c = &current_cpu_data;
 	unsigned int config0;
@@ -208,6 +206,7 @@ __cpuinit void spram_config(void)
 	case CPU_24K:
 	case CPU_34K:
 	case CPU_74K:
+	case CPU_1004K:
 		config0 = read_c0_config();
 		/* FIXME: addresses are Malta specific */
 		if (config0 & (1<<24)) {
diff --git a/arch/mips/kernel/vpe.c b/arch/mips/kernel/vpe.c
index 03092ab2a29..60477529362 100644
--- a/arch/mips/kernel/vpe.c
+++ b/arch/mips/kernel/vpe.c
@@ -1116,8 +1116,6 @@ static int vpe_open(struct inode *inode, struct file *filp)
 	v->shared_ptr = NULL;
 	v->__start = 0;
 
-	unlock_kernel();
-
 	return 0;
 }