Merge branch 'akpm' (patches from Andrew Morton)

Merge fixes from Andrew Morton:
 "The nmi patch and watchdog patch aren't actually fixes - they're
  features which needed a few last-minutes touchups.

  Otherwise, a rather large batch of fixes - ocfs2 review takes a while
  and I got distracted and missed last week's batch"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (31 commits)
  ocfs2/dlm: do not purge lockres that is queued for assert master
  ocfs2: do not return DLM_MIGRATE_RESPONSE_MASTERY_REF to avoid endless,loop during umount
  ocfs2: manually do the iput once ocfs2_add_entry failed in ocfs2_symlink and ocfs2_mknod
  ocfs2: fix a tiny race when running dirop_fileop_racer
  ocfs2/dlm: fix misuse of list_move_tail() in dlm_run_purge_list()
  ocfs2: refcount: take rw_lock in ocfs2_reflink
  ocfs2: revert "ocfs2: fix NULL pointer dereference when dismount and ocfs2rec simultaneously"
  ocfs2: fix deadlock when two nodes are converting same lock from PR to EX and idletimeout closes conn
  ocfs2: should add inode into orphan dir after updating entry in ocfs2_rename()
  mm: fix crashes from mbind() merging vmas
  checkpatch: reduce false positives when checking void function return statements
  ia64: arch/ia64/include/uapi/asm/fcntl.h needs personality.h
  DMA, CMA: fix possible memory leak
  slab: fix oops when reading /proc/slab_allocators
  shmem: fix faulting into a hole while it's punched
  mm: let mm_find_pmd fix buggy race with THP fault
  mm: thp: fix DEBUG_PAGEALLOC oops in copy_page_rep()
  kernel/watchdog.c: print traces for all cpus on lockup detection
  nmi: provide the option to issue an NMI back trace to every cpu but current
  Documentation/accounting/getdelays.c: add missing null-terminate after strncpy call
  ...

CREDITS

@@ -9,6 +9,10 @@
 			Linus
 ----------
 
+M: Matt Mackal
+E: mpm@selenic.com
+D: SLOB slab allocator
+
 N: Matti Aarnio
 E: mea@nic.funet.fi
 D: Alpha systems hacking, IPv6 and other network related stuff

Documentation/accounting/getdelays.c

@@ -314,6 +314,7 @@ int main(int argc, char *argv[])
 			break;
 		case 'm':
 			strncpy(cpumask, optarg, sizeof(cpumask));
+			cpumask[sizeof(cpumask) - 1] = '\0';
 			maskset = 1;
 			printf("cpumask %s maskset %d\n", cpumask, maskset);
 			break;

Documentation/kernel-parameters.txt

@@ -3130,6 +3130,11 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 			[KNL] Should the soft-lockup detector generate panics.
 			Format: <integer>
 
+	softlockup_all_cpu_backtrace=
+			[KNL] Should the soft-lockup detector generate
+			backtraces on all cpus.
+			Format: <integer>
+
 	sonypi.*=	[HW] Sony Programmable I/O Control Device driver
 			See Documentation/laptops/sonypi.txt
 

Documentation/memory-hotplug.txt

@@ -209,15 +209,12 @@ If memory device is found, memory hotplug code will be called.
 
 4.2 Notify memory hot-add event by hand
 ------------
-On powerpc, the firmware does not notify a memory hotplug event to the kernel.
-Therefore, "probe" interface is supported to notify the event to the kernel.
-This interface depends on CONFIG_ARCH_MEMORY_PROBE.
-
-CONFIG_ARCH_MEMORY_PROBE is supported on powerpc only. On x86, this config
-option is disabled by default since ACPI notifies a memory hotplug event to
-the kernel, which performs its hotplug operation as the result. Please
-enable this option if you need the "probe" interface for testing purposes
-on x86.
+On some architectures, the firmware may not notify the kernel of a memory
+hotplug event.  Therefore, the memory "probe" interface is supported to
+explicitly notify the kernel.  This interface depends on
+CONFIG_ARCH_MEMORY_PROBE and can be configured on powerpc, sh, and x86
+if hotplug is supported, although for x86 this should be handled by ACPI
+notification.
 
 Probe interface is located at
 /sys/devices/system/memory/probe

Documentation/sysctl/kernel.txt

@@ -75,6 +75,7 @@ show up in /proc/sys/kernel:
 - shmall
 - shmmax                      [ sysv ipc ]
 - shmmni
+- softlockup_all_cpu_backtrace
 - stop-a                      [ SPARC only ]
 - sysrq                       ==> Documentation/sysrq.txt
 - sysctl_writes_strict
@@ -783,6 +784,22 @@ via the /proc/sys interface:
 
 ==============================================================
 
+softlockup_all_cpu_backtrace:
+
+This value controls the soft lockup detector thread's behavior
+when a soft lockup condition is detected as to whether or not
+to gather further debug information. If enabled, each cpu will
+be issued an NMI and instructed to capture stack trace.
+
+This feature is only applicable for architectures which support
+NMI.
+
+0: do nothing. This is the default behavior.
+
+1: on detection capture more debug information.
+
+==============================================================
+
 tainted:
 
 Non-zero if the kernel has been tainted.  Numeric values, which

Documentation/sysctl/vm.txt

@@ -702,7 +702,8 @@ The batch value of each per cpu pagelist is also updated as a result.  It is
 set to pcp->high/4.  The upper limit of batch is (PAGE_SHIFT * 8)
 
 The initial value is zero.  Kernel does not use this value at boot time to set
-the high water marks for each per cpu page list.
+the high water marks for each per cpu page list.  If the user writes '0' to this
+sysctl, it will revert to this default behavior.
 
 ==============================================================
 

MAINTAINERS

@@ -8196,13 +8196,15 @@ S:	Maintained
 F:	drivers/usb/misc/sisusbvga/
 
 SLAB ALLOCATOR
-M:	Christoph Lameter <cl@linux-foundation.org>
+M:	Christoph Lameter <cl@linux.com>
 M:	Pekka Enberg <penberg@kernel.org>
-M:	Matt Mackall <mpm@selenic.com>
+M:	David Rientjes <rientjes@google.com>
+M:	Joonsoo Kim <iamjoonsoo.kim@lge.com>
+M:	Andrew Morton <akpm@linux-foundation.org>
 L:	linux-mm@kvack.org
 S:	Maintained
 F:	include/linux/sl?b*.h
-F:	mm/sl?b.c
+F:	mm/sl?b*
 
 SLEEPABLE READ-COPY UPDATE (SRCU)
 M:	Lai Jiangshan <laijs@cn.fujitsu.com>

arch/ia64/include/uapi/asm/fcntl.h

@@ -8,6 +8,7 @@
 #define force_o_largefile()	\
 		(personality(current->personality) != PER_LINUX32)
 
+#include <linux/personality.h>
 #include <asm-generic/fcntl.h>
 
 #endif /* _ASM_IA64_FCNTL_H */

arch/sparc/include/asm/irq_64.h

@@ -89,7 +89,7 @@ static inline unsigned long get_softint(void)
 	return retval;
 }
 
-void arch_trigger_all_cpu_backtrace(void);
+void arch_trigger_all_cpu_backtrace(bool);
 #define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
 
 extern void *hardirq_stack[NR_CPUS];

arch/sparc/kernel/process_64.c

@@ -239,7 +239,7 @@ static void __global_reg_poll(struct global_reg_snapshot *gp)
 	}
 }
 
-void arch_trigger_all_cpu_backtrace(void)
+void arch_trigger_all_cpu_backtrace(bool include_self)
 {
 	struct thread_info *tp = current_thread_info();
 	struct pt_regs *regs = get_irq_regs();
@@ -251,16 +251,22 @@ void arch_trigger_all_cpu_backtrace(void)
 
 	spin_lock_irqsave(&global_cpu_snapshot_lock, flags);
 
-	memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
-
 	this_cpu = raw_smp_processor_id();
 
-	__global_reg_self(tp, regs, this_cpu);
+	memset(global_cpu_snapshot, 0, sizeof(global_cpu_snapshot));
+
+	if (include_self)
+		__global_reg_self(tp, regs, this_cpu);
 
 	smp_fetch_global_regs();
 
 	for_each_online_cpu(cpu) {
-		struct global_reg_snapshot *gp = &global_cpu_snapshot[cpu].reg;
+		struct global_reg_snapshot *gp;
+
+		if (!include_self && cpu == this_cpu)
+			continue;
+
+		gp = &global_cpu_snapshot[cpu].reg;
 
 		__global_reg_poll(gp);
 
@@ -292,7 +298,7 @@ void arch_trigger_all_cpu_backtrace(void)
 
 static void sysrq_handle_globreg(int key)
 {
-	arch_trigger_all_cpu_backtrace();
+	arch_trigger_all_cpu_backtrace(true);
 }
 
 static struct sysrq_key_op sparc_globalreg_op = {

arch/x86/include/asm/irq.h

@@ -43,7 +43,7 @@ extern int vector_used_by_percpu_irq(unsigned int vector);
 extern void init_ISA_irqs(void);
 
 #ifdef CONFIG_X86_LOCAL_APIC
-void arch_trigger_all_cpu_backtrace(void);
+void arch_trigger_all_cpu_backtrace(bool);
 #define arch_trigger_all_cpu_backtrace arch_trigger_all_cpu_backtrace
 #endif
 

arch/x86/kernel/apic/hw_nmi.c

@@ -33,31 +33,41 @@ static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
 /* "in progress" flag of arch_trigger_all_cpu_backtrace */
 static unsigned long backtrace_flag;
 
-void arch_trigger_all_cpu_backtrace(void)
+void arch_trigger_all_cpu_backtrace(bool include_self)
 {
 	int i;
+	int cpu = get_cpu();
 
-	if (test_and_set_bit(0, &backtrace_flag))
+	if (test_and_set_bit(0, &backtrace_flag)) {
 		/*
 		 * If there is already a trigger_all_cpu_backtrace() in progress
 		 * (backtrace_flag == 1), don't output double cpu dump infos.
 		 */
+		put_cpu();
 		return;
+	}
 
 	cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
+	if (!include_self)
+		cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
 
-	printk(KERN_INFO "sending NMI to all CPUs:\n");
-	apic->send_IPI_all(NMI_VECTOR);
+	if (!cpumask_empty(to_cpumask(backtrace_mask))) {
+		pr_info("sending NMI to %s CPUs:\n",
+			(include_self ? "all" : "other"));
+		apic->send_IPI_mask(to_cpumask(backtrace_mask), NMI_VECTOR);
+	}
 
 	/* Wait for up to 10 seconds for all CPUs to do the backtrace */
 	for (i = 0; i < 10 * 1000; i++) {
 		if (cpumask_empty(to_cpumask(backtrace_mask)))
 			break;
 		mdelay(1);
+		touch_softlockup_watchdog();
 	}
 
 	clear_bit(0, &backtrace_flag);
 	smp_mb__after_atomic();
+	put_cpu();
 }
 
 static int

drivers/base/dma-contiguous.c

@@ -176,14 +176,24 @@ static int __init cma_activate_area(struct cma *cma)
 		base_pfn = pfn;
 		for (j = pageblock_nr_pages; j; --j, pfn++) {
 			WARN_ON_ONCE(!pfn_valid(pfn));
+			/*
+			 * alloc_contig_range requires the pfn range
+			 * specified to be in the same zone. Make this
+			 * simple by forcing the entire CMA resv range
+			 * to be in the same zone.
+			 */
 			if (page_zone(pfn_to_page(pfn)) != zone)
-				return -EINVAL;
+				goto err;
 		}
 		init_cma_reserved_pageblock(pfn_to_page(base_pfn));
 	} while (--i);
 
 	mutex_init(&cma->lock);
 	return 0;
+
+err:
+	kfree(cma->bitmap);
+	return -EINVAL;
 }
 
 static struct cma cma_areas[MAX_CMA_AREAS];

drivers/memstick/host/rtsx_pci_ms.c

@@ -601,6 +601,7 @@ static int rtsx_pci_ms_drv_remove(struct platform_device *pdev)
 	pcr->slots[RTSX_MS_CARD].card_event = NULL;
 	msh = host->msh;
 	host->eject = true;
+	cancel_work_sync(&host->handle_req);
 
 	mutex_lock(&host->host_mutex);
 	if (host->req) {

fs/ocfs2/dlm/dlmcommon.h

@@ -331,6 +331,7 @@ struct dlm_lock_resource
 	u16 state;
 	char lvb[DLM_LVB_LEN];
 	unsigned int inflight_locks;
+	unsigned int inflight_assert_workers;
 	unsigned long refmap[BITS_TO_LONGS(O2NM_MAX_NODES)];
 };
 
@@ -910,6 +911,9 @@ void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
 void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
 				   struct dlm_lock_resource *res);
 
+void __dlm_lockres_grab_inflight_worker(struct dlm_ctxt *dlm,
+		struct dlm_lock_resource *res);
+
 void dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
 void dlm_queue_bast(struct dlm_ctxt *dlm, struct dlm_lock *lock);
 void __dlm_queue_ast(struct dlm_ctxt *dlm, struct dlm_lock *lock);

fs/ocfs2/dlm/dlmmaster.c

@@ -581,6 +581,7 @@ static void dlm_init_lockres(struct dlm_ctxt *dlm,
 	atomic_set(&res->asts_reserved, 0);
 	res->migration_pending = 0;
 	res->inflight_locks = 0;
+	res->inflight_assert_workers = 0;
 
 	res->dlm = dlm;
 
@@ -683,6 +684,43 @@ void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
 	wake_up(&res->wq);
 }
 
+void __dlm_lockres_grab_inflight_worker(struct dlm_ctxt *dlm,
+		struct dlm_lock_resource *res)
+{
+	assert_spin_locked(&res->spinlock);
+	res->inflight_assert_workers++;
+	mlog(0, "%s:%.*s: inflight assert worker++: now %u\n",
+			dlm->name, res->lockname.len, res->lockname.name,
+			res->inflight_assert_workers);
+}
+
+static void dlm_lockres_grab_inflight_worker(struct dlm_ctxt *dlm,
+		struct dlm_lock_resource *res)
+{
+	spin_lock(&res->spinlock);
+	__dlm_lockres_grab_inflight_worker(dlm, res);
+	spin_unlock(&res->spinlock);
+}
+
+static void __dlm_lockres_drop_inflight_worker(struct dlm_ctxt *dlm,
+		struct dlm_lock_resource *res)
+{
+	assert_spin_locked(&res->spinlock);
+	BUG_ON(res->inflight_assert_workers == 0);
+	res->inflight_assert_workers--;
+	mlog(0, "%s:%.*s: inflight assert worker--: now %u\n",
+			dlm->name, res->lockname.len, res->lockname.name,
+			res->inflight_assert_workers);
+}
+
+static void dlm_lockres_drop_inflight_worker(struct dlm_ctxt *dlm,
+		struct dlm_lock_resource *res)
+{
+	spin_lock(&res->spinlock);
+	__dlm_lockres_drop_inflight_worker(dlm, res);
+	spin_unlock(&res->spinlock);
+}
+
 /*
  * lookup a lock resource by name.
  * may already exist in the hashtable.
@@ -1603,7 +1641,8 @@ int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
 			mlog(ML_ERROR, "failed to dispatch assert master work\n");
 			response = DLM_MASTER_RESP_ERROR;
 			dlm_lockres_put(res);
-		}
+		} else
+			dlm_lockres_grab_inflight_worker(dlm, res);
 	} else {
 		if (res)
 			dlm_lockres_put(res);
@@ -2118,6 +2157,8 @@ static void dlm_assert_master_worker(struct dlm_work_item *item, void *data)
 	dlm_lockres_release_ast(dlm, res);
 
 put:
+	dlm_lockres_drop_inflight_worker(dlm, res);
+
 	dlm_lockres_put(res);
 
 	mlog(0, "finished with dlm_assert_master_worker\n");
@@ -3088,11 +3129,15 @@ static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
 			/* remove it so that only one mle will be found */
 			__dlm_unlink_mle(dlm, tmp);
 			__dlm_mle_detach_hb_events(dlm, tmp);
-			ret = DLM_MIGRATE_RESPONSE_MASTERY_REF;
-			mlog(0, "%s:%.*s: master=%u, newmaster=%u, "
-			    "telling master to get ref for cleared out mle "
-			    "during migration\n", dlm->name, namelen, name,
-			    master, new_master);
+			if (tmp->type == DLM_MLE_MASTER) {
+				ret = DLM_MIGRATE_RESPONSE_MASTERY_REF;
+				mlog(0, "%s:%.*s: master=%u, newmaster=%u, "
+						"telling master to get ref "
+						"for cleared out mle during "
+						"migration\n", dlm->name,
+						namelen, name, master,
+						new_master);
+			}
 		}
 		spin_unlock(&tmp->spinlock);
 	}

fs/ocfs2/dlm/dlmrecovery.c

@@ -1708,7 +1708,8 @@ int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
 				mlog_errno(-ENOMEM);
 				/* retry!? */
 				BUG();
-			}
+			} else
+				__dlm_lockres_grab_inflight_worker(dlm, res);
 		} else /* put.. incase we are not the master */
 			dlm_lockres_put(res);
 		spin_unlock(&res->spinlock);