Merge commit '8700c95adb03' into timers/nohz

The full dynticks tree needs the latest RCU and sched
upstream updates in order to fix some dependencies.

Merge a common upstream merge point that has these
updates.

Conflicts:
	include/linux/perf_event.h
	kernel/rcutree.h
	kernel/rcutree_plugin.h

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

17 files changed, 318 insertions, 155 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 3958dc4389f9..fe01d418b09a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -404,4 +404,7 @@ config OID_REGISTRY
         help
           Enable fast lookup object identifier registry.
 
+config UCS2_STRING
+        tristate
+
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index d7946ff75b2e..6e2cc561f761 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -174,3 +174,5 @@ quiet_cmd_build_OID_registry = GEN     $@
       cmd_build_OID_registry = perl $(srctree)/$(src)/build_OID_registry $< $@
 
 clean-files     += oid_registry_data.c
+
+obj-$(CONFIG_UCS2_STRING) += ucs2_string.o
diff --git a/lib/argv_split.c b/lib/argv_split.c
index 1e9a6cbc3689..e927ed0e18a8 100644
--- a/lib/argv_split.c
+++ b/lib/argv_split.c
@@ -8,23 +8,17 @@
 #include <linux/slab.h>
 #include <linux/export.h>
 
-static const char *skip_arg(const char *cp)
-{
-        while (*cp && !isspace(*cp))
-                cp++;
-
-        return cp;
-}
-
 static int count_argc(const char *str)
 {
         int count = 0;
+        bool was_space;
 
-        while (*str) {
-                str = skip_spaces(str);
-                if (*str) {
+        for (was_space = true; *str; str++) {
+                if (isspace(*str)) {
+                        was_space = true;
+                } else if (was_space) {
+                        was_space = false;
                         count++;
-                        str = skip_arg(str);
                 }
         }
 
@@ -39,10 +33,8 @@ static int count_argc(const char *str)
  */
 void argv_free(char **argv)
 {
-        char **p;
-        for (p = argv; *p; p++)
-                kfree(*p);
-
+        argv--;
+        kfree(argv[0]);
         kfree(argv);
 }
 EXPORT_SYMBOL(argv_free);
@@ -59,43 +51,44 @@ EXPORT_SYMBOL(argv_free);
  * considered to be a single argument separator.  The returned array
  * is always NULL-terminated.  Returns NULL on memory allocation
  * failure.
+ *
+ * The source string at `str' may be undergoing concurrent alteration via
+ * userspace sysctl activity (at least).  The argv_split() implementation
+ * attempts to handle this gracefully by taking a local copy to work on.
  */
 char **argv_split(gfp_t gfp, const char *str, int *argcp)
 {
-        int argc = count_argc(str);
-        char **argv = kzalloc(sizeof(*argv) * (argc+1), gfp);
-        char **argvp;
-
-        if (argv == NULL)
-                goto out;
-
-        if (argcp)
-                *argcp = argc;
-
-        argvp = argv;
-
-        while (*str) {
-                str = skip_spaces(str);
-
-                if (*str) {
-                        const char *p = str;
-                        char *t;
-
-                        str = skip_arg(str);
+        char *argv_str;
+        bool was_space;
+        char **argv, **argv_ret;
+        int argc;
+
+        argv_str = kstrndup(str, KMALLOC_MAX_SIZE - 1, gfp);
+        if (!argv_str)
+                return NULL;
+
+        argc = count_argc(argv_str);
+        argv = kmalloc(sizeof(*argv) * (argc + 2), gfp);
+        if (!argv) {
+                kfree(argv_str);
+                return NULL;
+        }
 
-                        t = kstrndup(p, str-p, gfp);
-                        if (t == NULL)
-                                goto fail;
-                        *argvp++ = t;
+        *argv = argv_str;
+        argv_ret = ++argv;
+        for (was_space = true; *argv_str; argv_str++) {
+                if (isspace(*argv_str)) {
+                        was_space = true;
+                        *argv_str = 0;
+                } else if (was_space) {
+                        was_space = false;
+                        *argv++ = argv_str;
                 }
         }
-        *argvp = NULL;
-
-  out:
-        return argv;
+        *argv = NULL;
 
-  fail:
-        argv_free(argv);
-        return NULL;
+        if (argcp)
+                *argcp = argc;
+        return argv_ret;
 }
 EXPORT_SYMBOL(argv_split);
diff --git a/lib/bust_spinlocks.c b/lib/bust_spinlocks.c
index 9681d54b95d1..f8e0e5367398 100644
--- a/lib/bust_spinlocks.c
+++ b/lib/bust_spinlocks.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/kernel.h>
+#include <linux/printk.h>
 #include <linux/spinlock.h>
 #include <linux/tty.h>
 #include <linux/wait.h>
@@ -28,5 +29,3 @@ void __attribute__((weak)) bust_spinlocks(int yes)
                         wake_up_klogd();
         }
 }
-
-
diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index 5e396accd3d0..d87a17a819d0 100644
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -862,17 +862,21 @@ static void check_unmap(struct dma_debug_entry *ref)
         entry = bucket_find_exact(bucket, ref);
 
         if (!entry) {
+                /* must drop lock before calling dma_mapping_error */
+                put_hash_bucket(bucket, &flags);
+
                 if (dma_mapping_error(ref->dev, ref->dev_addr)) {
                         err_printk(ref->dev, NULL,
-                                   "DMA-API: device driver tries "
-                                   "to free an invalid DMA memory address\n");
-                        return;
+                                   "DMA-API: device driver tries to free an "
+                                   "invalid DMA memory address\n");
+                } else {
+                        err_printk(ref->dev, NULL,
+                                   "DMA-API: device driver tries to free DMA "
+                                   "memory it has not allocated [device "
+                                   "address=0x%016llx] [size=%llu bytes]\n",
+                                   ref->dev_addr, ref->size);
                 }
-                err_printk(ref->dev, NULL, "DMA-API: device driver tries "
-                           "to free DMA memory it has not allocated "
-                           "[device address=0x%016llx] [size=%llu bytes]\n",
-                           ref->dev_addr, ref->size);
-                goto out;
+                return;
         }
 
         if (ref->size != entry->size) {
@@ -936,7 +940,6 @@ static void check_unmap(struct dma_debug_entry *ref)
         hash_bucket_del(entry);
         dma_entry_free(entry);
 
-out:
         put_hash_bucket(bucket, &flags);
 }
 
@@ -1082,13 +1085,27 @@ void debug_dma_mapping_error(struct device *dev, dma_addr_t dma_addr)
         ref.dev = dev;
         ref.dev_addr = dma_addr;
         bucket = get_hash_bucket(&ref, &flags);
-        entry = bucket_find_exact(bucket, &ref);
 
-        if (!entry)
-                goto out;
+        list_for_each_entry(entry, &bucket->list, list) {
+                if (!exact_match(&ref, entry))
+                        continue;
+
+                /*
+                 * The same physical address can be mapped multiple
+                 * times. Without a hardware IOMMU this results in the
+                 * same device addresses being put into the dma-debug
+                 * hash multiple times too. This can result in false
+                 * positives being reported. Therefore we implement a
+                 * best-fit algorithm here which updates the first entry
+                 * from the hash which fits the reference value and is
+                 * not currently listed as being checked.
+                 */
+                if (entry->map_err_type == MAP_ERR_NOT_CHECKED) {
+                        entry->map_err_type = MAP_ERR_CHECKED;
+                        break;
+                }
+        }
 
-        entry->map_err_type = MAP_ERR_CHECKED;
-out:
         put_hash_bucket(bucket, &flags);
 }
 EXPORT_SYMBOL(debug_dma_mapping_error);
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
index 5276b99ca650..46032453abd5 100644
--- a/lib/dynamic_debug.c
+++ b/lib/dynamic_debug.c
@@ -281,7 +281,6 @@ static inline int parse_lineno(const char *str, unsigned int *val)
  * allow the user to express a query which matches a format
  * containing embedded spaces.
  */
-#define isodigit(c)             ((c) >= '0' && (c) <= '7')
 static char *unescape(char *str)
 {
         char *in = str;
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index f7210ad6cffd..c5c7a762b850 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -122,7 +122,7 @@ bool should_fail(struct fault_attr *attr, ssize_t size)
                         return false;
         }
 
-        if (attr->probability <= random32() % 100)
+        if (attr->probability <= prandom_u32() % 100)
                 return false;
 
         if (!fail_stacktrace(attr))
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 54920433705a..b35cfa9bc3d4 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -34,6 +34,8 @@
 #include <linux/rculist.h>
 #include <linux/interrupt.h>
 #include <linux/genalloc.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
 
 static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set)
 {
@@ -480,3 +482,82 @@ unsigned long gen_pool_best_fit(unsigned long *map, unsigned long size,
         return start_bit;
 }
 EXPORT_SYMBOL(gen_pool_best_fit);
+
+static void devm_gen_pool_release(struct device *dev, void *res)
+{
+        gen_pool_destroy(*(struct gen_pool **)res);
+}
+
+/**
+ * devm_gen_pool_create - managed gen_pool_create
+ * @dev: device that provides the gen_pool
+ * @min_alloc_order: log base 2 of number of bytes each bitmap bit represents
+ * @nid: node id of the node the pool structure should be allocated on, or -1
+ *
+ * Create a new special memory pool that can be used to manage special purpose
+ * memory not managed by the regular kmalloc/kfree interface. The pool will be
+ * automatically destroyed by the device management code.
+ */
+struct gen_pool *devm_gen_pool_create(struct device *dev, int min_alloc_order,
+                int nid)
+{
+        struct gen_pool **ptr, *pool;
+
+        ptr = devres_alloc(devm_gen_pool_release, sizeof(*ptr), GFP_KERNEL);
+
+        pool = gen_pool_create(min_alloc_order, nid);
+        if (pool) {
+                *ptr = pool;
+                devres_add(dev, ptr);
+        } else {
+                devres_free(ptr);
+        }
+
+        return pool;
+}
+
+/**
+ * dev_get_gen_pool - Obtain the gen_pool (if any) for a device
+ * @dev: device to retrieve the gen_pool from
+ * @name: Optional name for the gen_pool, usually NULL
+ *
+ * Returns the gen_pool for the device if one is present, or NULL.
+ */
+struct gen_pool *dev_get_gen_pool(struct device *dev)
+{
+        struct gen_pool **p = devres_find(dev, devm_gen_pool_release, NULL,
+                                        NULL);
+
+        if (!p)
+                return NULL;
+        return *p;
+}
+EXPORT_SYMBOL_GPL(dev_get_gen_pool);
+
+#ifdef CONFIG_OF
+/**
+ * of_get_named_gen_pool - find a pool by phandle property
+ * @np: device node
+ * @propname: property name containing phandle(s)
+ * @index: index into the phandle array
+ *
+ * Returns the pool that contains the chunk starting at the physical
+ * address of the device tree node pointed at by the phandle property,
+ * or NULL if not found.
+ */
+struct gen_pool *of_get_named_gen_pool(struct device_node *np,
+        const char *propname, int index)
+{
+        struct platform_device *pdev;
+        struct device_node *np_pool;
+
+        np_pool = of_parse_phandle(np, propname, index);
+        if (!np_pool)
+                return NULL;
+        pdev = of_find_device_by_node(np_pool);
+        if (!pdev)
+                return NULL;
+        return dev_get_gen_pool(&pdev->dev);
+}
+EXPORT_SYMBOL_GPL(of_get_named_gen_pool);
+#endif /* CONFIG_OF */
diff --git a/lib/idr.c b/lib/idr.c
index 73f4d53c02f3..cca4b9302a71 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -106,8 +106,14 @@ static struct idr_layer *idr_layer_alloc(gfp_t gfp_mask, struct idr *layer_idr)
         if (layer_idr)
                 return get_from_free_list(layer_idr);
 
-        /* try to allocate directly from kmem_cache */
-        new = kmem_cache_zalloc(idr_layer_cache, gfp_mask);
+        /*
+         * Try to allocate directly from kmem_cache.  We want to try this
+         * before preload buffer; otherwise, non-preloading idr_alloc()
+         * users will end up taking advantage of preloading ones.  As the
+         * following is allowed to fail for preloaded cases, suppress
+         * warning this time.
+         */
+        new = kmem_cache_zalloc(idr_layer_cache, gfp_mask | __GFP_NOWARN);
         if (new)
                 return new;
 
@@ -115,18 +121,24 @@ static struct idr_layer *idr_layer_alloc(gfp_t gfp_mask, struct idr *layer_idr)
          * Try to fetch one from the per-cpu preload buffer if in process
          * context.  See idr_preload() for details.
          */
-        if (in_interrupt())
-                return NULL;
-
-        preempt_disable();
-        new = __this_cpu_read(idr_preload_head);
-        if (new) {
-                __this_cpu_write(idr_preload_head, new->ary[0]);
-                __this_cpu_dec(idr_preload_cnt);
-                new->ary[0] = NULL;
+        if (!in_interrupt()) {
+                preempt_disable();
+                new = __this_cpu_read(idr_preload_head);
+                if (new) {
+                        __this_cpu_write(idr_preload_head, new->ary[0]);
+                        __this_cpu_dec(idr_preload_cnt);
+                        new->ary[0] = NULL;
+                }
+                preempt_enable();
+                if (new)
+                        return new;
         }
-        preempt_enable();
-        return new;
+
+        /*
+         * Both failed.  Try kmem_cache again w/o adding __GFP_NOWARN so
+         * that memory allocation failure warning is printed as intended.
+         */
+        return kmem_cache_zalloc(idr_layer_cache, gfp_mask);
 }
 
 static void idr_layer_rcu_free(struct rcu_head *head)
@@ -184,20 +196,7 @@ static void idr_mark_full(struct idr_layer **pa, int id)
         }
 }
 
-/**
- * idr_pre_get - reserve resources for idr allocation
- * @idp:        idr handle
- * @gfp_mask:   memory allocation flags
- *
- * This function should be called prior to calling the idr_get_new* functions.
- * It preallocates enough memory to satisfy the worst possible allocation. The
- * caller should pass in GFP_KERNEL if possible.  This of course requires that
- * no spinning locks be held.
- *
- * If the system is REALLY out of memory this function returns %0,
- * otherwise %1.
- */
-int idr_pre_get(struct idr *idp, gfp_t gfp_mask)
+int __idr_pre_get(struct idr *idp, gfp_t gfp_mask)
 {
         while (idp->id_free_cnt < MAX_IDR_FREE) {
                 struct idr_layer *new;
@@ -208,13 +207,12 @@ int idr_pre_get(struct idr *idp, gfp_t gfp_mask)
         }
         return 1;
 }
-EXPORT_SYMBOL(idr_pre_get);
+EXPORT_SYMBOL(__idr_pre_get);
 
 /**
  * sub_alloc - try to allocate an id without growing the tree depth
  * @idp: idr handle
  * @starting_id: id to start search at
- * @id: pointer to the allocated handle
  * @pa: idr_layer[MAX_IDR_LEVEL] used as backtrack buffer
  * @gfp_mask: allocation mask for idr_layer_alloc()
  * @layer_idr: optional idr passed to idr_layer_alloc()
@@ -376,25 +374,7 @@ static void idr_fill_slot(struct idr *idr, void *ptr, int id,
         idr_mark_full(pa, id);
 }
 
-/**
- * idr_get_new_above - allocate new idr entry above or equal to a start id
- * @idp: idr handle
- * @ptr: pointer you want associated with the id
- * @starting_id: id to start search at
- * @id: pointer to the allocated handle
- *
- * This is the allocate id function.  It should be called with any
- * required locks.
- *
- * If allocation from IDR's private freelist fails, idr_get_new_above() will
- * return %-EAGAIN.  The caller should retry the idr_pre_get() call to refill
- * IDR's preallocation and then retry the idr_get_new_above() call.
- *
- * If the idr is full idr_get_new_above() will return %-ENOSPC.
- *
- * @id returns a value in the range @starting_id ... %0x7fffffff
- */
-int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id)
+int __idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id)
 {
         struct idr_layer *pa[MAX_IDR_LEVEL + 1];
         int rv;
@@ -407,7 +387,7 @@ int idr_get_new_above(struct idr *idp, void *ptr, int starting_id, int *id)
         *id = rv;
         return 0;
 }
-EXPORT_SYMBOL(idr_get_new_above);
+EXPORT_SYMBOL(__idr_get_new_above);
 
 /**
  * idr_preload - preload for idr_alloc()
@@ -515,6 +495,33 @@ int idr_alloc(struct idr *idr, void *ptr, int start, int end, gfp_t gfp_mask)
 }
 EXPORT_SYMBOL_GPL(idr_alloc);
 
+/**
+ * idr_alloc_cyclic - allocate new idr entry in a cyclical fashion
+ * @idr: the (initialized) idr
+ * @ptr: pointer to be associated with the new id
+ * @start: the minimum id (inclusive)
+ * @end: the maximum id (exclusive, <= 0 for max)
+ * @gfp_mask: memory allocation flags
+ *
+ * Essentially the same as idr_alloc, but prefers to allocate progressively
+ * higher ids if it can. If the "cur" counter wraps, then it will start again
+ * at the "start" end of the range and allocate one that has already been used.
+ */
+int idr_alloc_cyclic(struct idr *idr, void *ptr, int start, int end,
+                        gfp_t gfp_mask)
+{
+        int id;
+
+        id = idr_alloc(idr, ptr, max(start, idr->cur), end, gfp_mask);
+        if (id == -ENOSPC)
+                id = idr_alloc(idr, ptr, start, end, gfp_mask);
+
+        if (likely(id >= 0))
+                idr->cur = id + 1;
+        return id;
+}
+EXPORT_SYMBOL(idr_alloc_cyclic);
+
 static void idr_remove_warning(int id)
 {
         printk(KERN_WARNING
@@ -569,8 +576,7 @@ void idr_remove(struct idr *idp, int id)
         struct idr_layer *p;
         struct idr_layer *to_free;
 
-        /* see comment in idr_find_slowpath() */
-        if (WARN_ON_ONCE(id < 0))
+        if (id < 0)
                 return;
 
         sub_remove(idp, (idp->layers - 1) * IDR_BITS, id);
@@ -667,15 +673,7 @@ void *idr_find_slowpath(struct idr *idp, int id)
         int n;
         struct idr_layer *p;
 
-        /*
-         * If @id is negative, idr_find() used to ignore the sign bit and
-         * performed lookup with the rest of bits, which is weird and can
-         * lead to very obscure bugs.  We're now returning NULL for all
-         * negative IDs but just in case somebody was depending on the sign
-         * bit being ignored, let's trigger WARN_ON_ONCE() so that they can
-         * be detected and fixed.  WARN_ON_ONCE() can later be removed.
-         */
-        if (WARN_ON_ONCE(id < 0))
+        if (id < 0)
                 return NULL;
 
         p = rcu_dereference_raw(idp->top);
@@ -824,8 +822,7 @@ void *idr_replace(struct idr *idp, void *ptr, int id)
         int n;
         struct idr_layer *p, *old_p;
 
-        /* see comment in idr_find_slowpath() */
-        if (WARN_ON_ONCE(id < 0))
+        if (id < 0)
                 return ERR_PTR(-EINVAL);
 
         p = idp->top;
@@ -918,7 +915,7 @@ static void free_bitmap(struct ida *ida, struct ida_bitmap *bitmap)
 int ida_pre_get(struct ida *ida, gfp_t gfp_mask)
 {
         /* allocate idr_layers */
-        if (!idr_pre_get(&ida->idr, gfp_mask))
+        if (!__idr_pre_get(&ida->idr, gfp_mask))
                 return 0;
 
         /* allocate free_bitmap */
diff --git a/lib/int_sqrt.c b/lib/int_sqrt.c
index fc2eeb7cb2ea..1ef4cc344977 100644
--- a/lib/int_sqrt.c
+++ b/lib/int_sqrt.c
@@ -1,3 +1,9 @@
+/*
+ * Copyright (C) 2013 Davidlohr Bueso <davidlohr.bueso@hp.com>
+ *
+ *  Based on the shift-and-subtract algorithm for computing integer
+ *  square root from Guy L. Steele.
+ */
 
 #include <linux/kernel.h>
 #include <linux/export.h>
@@ -10,23 +16,23 @@
  */
 unsigned long int_sqrt(unsigned long x)
 {
-        unsigned long op, res, one;
+        unsigned long b, m, y = 0;
 
-        op = x;
-        res = 0;
+        if (x <= 1)
+                return x;
 
-        one = 1UL << (BITS_PER_LONG - 2);
-        while (one > op)
-                one >>= 2;
+        m = 1UL << (BITS_PER_LONG - 2);
+        while (m != 0) {
+                b = y + m;
+                y >>= 1;
 
-        while (one != 0) {
-                if (op >= res + one) {
-                        op = op - (res + one);
-                        res = res +  2 * one;
+                if (x >= b) {
+                        x -= b;
+                        y += m;
                 }
-                res /= 2;
-                one /= 4;
+                m >>= 2;
         }
-        return res;
+
+        return y;
 }
 EXPORT_SYMBOL(int_sqrt);
diff --git a/lib/kobject.c b/lib/kobject.c
index e07ee1fcd6f1..a65486613d79 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -529,6 +529,13 @@ struct kobject *kobject_get(struct kobject *kobj)
         return kobj;
 }
 
+static struct kobject *kobject_get_unless_zero(struct kobject *kobj)
+{
+        if (!kref_get_unless_zero(&kobj->kref))
+                kobj = NULL;
+        return kobj;
+}
+
 /*
  * kobject_cleanup - free kobject resources.
  * @kobj: object to cleanup
@@ -751,7 +758,7 @@ struct kobject *kset_find_obj(struct kset *kset, const char *name)
 
         list_for_each_entry(k, &kset->list, entry) {
                 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
-                        ret = kobject_get(k);
+                        ret = kobject_get_unless_zero(k);
                         break;
                 }
         }
diff --git a/lib/list_sort.c b/lib/list_sort.c
index d7325c6b103f..1183fa70a44d 100644
--- a/lib/list_sort.c
+++ b/lib/list_sort.c
@@ -229,7 +229,7 @@ static int __init list_sort_test(void)
                         goto exit;
                 }
                  /* force some equivalencies */
-                el->value = random32() % (TEST_LIST_LEN/3);
+                el->value = prandom_u32() % (TEST_LIST_LEN / 3);
                 el->serial = i;
                 el->poison1 = TEST_POISON1;
                 el->poison2 = TEST_POISON2;
diff --git a/lib/show_mem.c b/lib/show_mem.c
index 4407f8c9b1f7..b7c72311ad0c 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -18,6 +18,9 @@ void show_mem(unsigned int filter)
         printk("Mem-Info:\n");
         show_free_areas(filter);
 
+        if (filter & SHOW_MEM_FILTER_PAGE_COUNT)
+                return;
+
         for_each_online_pgdat(pgdat) {
                 unsigned long i, flags;
 
diff --git a/lib/swiotlb.c b/lib/swiotlb.c
index bfe02b8fc55b..d23762e6652c 100644
--- a/lib/swiotlb.c
+++ b/lib/swiotlb.c
@@ -105,9 +105,9 @@ setup_io_tlb_npages(char *str)
         if (!strcmp(str, "force"))
                 swiotlb_force = 1;
 
-        return 1;
+        return 0;
 }
-__setup("swiotlb=", setup_io_tlb_npages);
+early_param("swiotlb", setup_io_tlb_npages);
 /* make io_tlb_overflow tunable too? */
 
 unsigned long swiotlb_nr_tbl(void)
@@ -115,6 +115,18 @@ unsigned long swiotlb_nr_tbl(void)
         return io_tlb_nslabs;
 }
 EXPORT_SYMBOL_GPL(swiotlb_nr_tbl);
+
+/* default to 64MB */
+#define IO_TLB_DEFAULT_SIZE (64UL<<20)
+unsigned long swiotlb_size_or_default(void)
+{
+        unsigned long size;
+
+        size = io_tlb_nslabs << IO_TLB_SHIFT;
+
+        return size ? size : (IO_TLB_DEFAULT_SIZE);
+}
+
 /* Note that this doesn't work with highmem page */
 static dma_addr_t swiotlb_virt_to_bus(struct device *hwdev,
                                       volatile void *address)
@@ -188,8 +200,7 @@ int __init swiotlb_init_with_tbl(char *tlb, unsigned long nslabs, int verbose)
 void  __init
 swiotlb_init(int verbose)
 {
-        /* default to 64MB */
-        size_t default_size = 64UL<<20;
+        size_t default_size = IO_TLB_DEFAULT_SIZE;
         unsigned char *vstart;
         unsigned long bytes;
 
diff --git a/lib/ucs2_string.c b/lib/ucs2_string.c
new file mode 100644
index 000000000000..6f500ef2301d
--- /dev/null
+++ b/lib/ucs2_string.c
@@ -0,0 +1,51 @@
+#include <linux/ucs2_string.h>
+#include <linux/module.h>
+
+/* Return the number of unicode characters in data */
+unsigned long
+ucs2_strnlen(const ucs2_char_t *s, size_t maxlength)
+{
+        unsigned long length = 0;
+
+        while (*s++ != 0 && length < maxlength)
+                length++;
+        return length;
+}
+EXPORT_SYMBOL(ucs2_strnlen);
+
+unsigned long
+ucs2_strlen(const ucs2_char_t *s)
+{
+        return ucs2_strnlen(s, ~0UL);
+}
+EXPORT_SYMBOL(ucs2_strlen);
+
+/*
+ * Return the number of bytes is the length of this string
+ * Note: this is NOT the same as the number of unicode characters
+ */
+unsigned long
+ucs2_strsize(const ucs2_char_t *data, unsigned long maxlength)
+{
+        return ucs2_strnlen(data, maxlength/sizeof(ucs2_char_t)) * sizeof(ucs2_char_t);
+}
+EXPORT_SYMBOL(ucs2_strsize);
+
+int
+ucs2_strncmp(const ucs2_char_t *a, const ucs2_char_t *b, size_t len)
+{
+        while (1) {
+                if (len == 0)
+                        return 0;
+                if (*a < *b)
+                        return -1;
+                if (*a > *b)
+                        return 1;
+                if (*a == 0) /* implies *b == 0 */
+                        return 0;
+                a++;
+                b++;
+                len--;
+        }
+}
+EXPORT_SYMBOL(ucs2_strncmp);
diff --git a/lib/uuid.c b/lib/uuid.c
index 52a6fe6387de..398821e4dce1 100644
--- a/lib/uuid.c
+++ b/lib/uuid.c
@@ -25,13 +25,7 @@
 
 static void __uuid_gen_common(__u8 b[16])
 {
-        int i;
-        u32 r;
-
-        for (i = 0; i < 4; i++) {
-                r = random32();
-                memcpy(b + i * 4, &r, 4);
-        }
+        prandom_bytes(b, 16);
         /* reversion 0b10 */
         b[8] = (b[8] & 0x3F) | 0x80;
 }
diff --git a/lib/xz/Kconfig b/lib/xz/Kconfig
index 82a04d7ba99e..08837db52d94 100644
--- a/lib/xz/Kconfig
+++ b/lib/xz/Kconfig
@@ -15,7 +15,7 @@ config XZ_DEC_X86
 
 config XZ_DEC_POWERPC
         bool "PowerPC BCJ filter decoder"
-        default y if POWERPC
+        default y if PPC
         select XZ_DEC_BCJ
 
 config XZ_DEC_IA64