Merge branch 'master' into for-next

Fast-forward merge with Linus to be able to merge patches
based on more recent version of the tree.

15 files changed, 862 insertions, 244 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 32f3e5ae2be5..6c695ff9caba 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -276,4 +276,7 @@ config CORDIC
           so its calculations are in fixed point. Modules can select this
           when they require this function. Module will be called cordic.
 
+config LLIST
+        bool
+
 endmenu
diff --git a/lib/Makefile b/lib/Makefile
index 892f4e282ea1..3f5bc6d903e0 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -10,9 +10,9 @@ endif
 lib-y := ctype.o string.o vsprintf.o cmdline.o \
          rbtree.o radix-tree.o dump_stack.o timerqueue.o\
          idr.o int_sqrt.o extable.o prio_tree.o \
-         sha1.o irq_regs.o reciprocal_div.o argv_split.o \
+         sha1.o md5.o irq_regs.o reciprocal_div.o argv_split.o \
          proportions.o prio_heap.o ratelimit.o show_mem.o \
-         is_single_threaded.o plist.o decompress.o find_next_bit.o
+         is_single_threaded.o plist.o decompress.o
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -22,7 +22,7 @@ lib-y	+= kobject.o kref.o klist.o
 obj-y += bcd.o div64.o sort.o parser.o halfmd4.o debug_locks.o random32.o \
          bust_spinlocks.o hexdump.o kasprintf.o bitmap.o scatterlist.o \
          string_helpers.o gcd.o lcm.o list_sort.o uuid.o flex_array.o \
-         bsearch.o find_last_bit.o
+         bsearch.o find_last_bit.o find_next_bit.o
 obj-y += kstrtox.o
 obj-$(CONFIG_TEST_KSTRTOX) += test-kstrtox.o
 
@@ -115,6 +115,8 @@ obj-$(CONFIG_CPU_RMAP) += cpu_rmap.o
 
 obj-$(CONFIG_CORDIC) += cordic.o
 
+obj-$(CONFIG_LLIST) += llist.o
+
 hostprogs-y     := gen_crc32table
 clean-files     := crc32table.h
 
diff --git a/lib/atomic64.c b/lib/atomic64.c
index a21c12bc727c..e12ae0dd08a8 100644
--- a/lib/atomic64.c
+++ b/lib/atomic64.c
@@ -14,7 +14,7 @@
 #include <linux/spinlock.h>
 #include <linux/init.h>
 #include <linux/module.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 
 /*
  * We use a hashed array of spinlocks to provide exclusive access
diff --git a/lib/atomic64_test.c b/lib/atomic64_test.c
index 44524cc8c32a..0c33cde2a1e6 100644
--- a/lib/atomic64_test.c
+++ b/lib/atomic64_test.c
@@ -10,7 +10,7 @@
  */
 #include <linux/init.h>
 #include <linux/kernel.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 
 #define INIT(c) do { atomic64_set(&v, c); r = c; } while (0)
 static __init int test_atomic64(void)
diff --git a/lib/bitmap.c b/lib/bitmap.c
index 3f3b68199d74..2f4412e4d071 100644
--- a/lib/bitmap.c
+++ b/lib/bitmap.c
@@ -271,8 +271,6 @@ int __bitmap_weight(const unsigned long *bitmap, int bits)
 }
 EXPORT_SYMBOL(__bitmap_weight);
 
-#define BITMAP_FIRST_WORD_MASK(start) (~0UL << ((start) % BITS_PER_LONG))
-
 void bitmap_set(unsigned long *map, int start, int nr)
 {
         unsigned long *p = map + BIT_WORD(start);
@@ -756,7 +754,7 @@ static int bitmap_pos_to_ord(const unsigned long *buf, int pos, int bits)
  *
  * The bit positions 0 through @bits are valid positions in @buf.
  */
-static int bitmap_ord_to_pos(const unsigned long *buf, int ord, int bits)
+int bitmap_ord_to_pos(const unsigned long *buf, int ord, int bits)
 {
         int pos = 0;
 
diff --git a/lib/cpumask.c b/lib/cpumask.c
index 05d6aca7fc19..af3e5817de98 100644
--- a/lib/cpumask.c
+++ b/lib/cpumask.c
@@ -30,7 +30,7 @@ int __any_online_cpu(const cpumask_t *mask)
 {
         int cpu;
 
-        for_each_cpu_mask(cpu, *mask) {
+        for_each_cpu(cpu, mask) {
                 if (cpu_online(cpu))
                         break;
         }
@@ -131,7 +131,7 @@ EXPORT_SYMBOL(zalloc_cpumask_var_node);
  */
 bool alloc_cpumask_var(cpumask_var_t *mask, gfp_t flags)
 {
-        return alloc_cpumask_var_node(mask, flags, numa_node_id());
+        return alloc_cpumask_var_node(mask, flags, NUMA_NO_NODE);
 }
 EXPORT_SYMBOL(alloc_cpumask_var);
 
diff --git a/lib/crc32.c b/lib/crc32.c
index 4855995fcde9..a6e633a48cea 100644
--- a/lib/crc32.c
+++ b/lib/crc32.c
@@ -26,7 +26,7 @@
 #include <linux/compiler.h>
 #include <linux/types.h>
 #include <linux/init.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 #include "crc32defs.h"
 #if CRC_LE_BITS == 8
 # define tole(x) __constant_cpu_to_le32(x)
diff --git a/lib/dec_and_lock.c b/lib/dec_and_lock.c
index e73822aa6e9a..b5257725daad 100644
--- a/lib/dec_and_lock.c
+++ b/lib/dec_and_lock.c
@@ -1,6 +1,6 @@
 #include <linux/module.h>
 #include <linux/spinlock.h>
-#include <asm/atomic.h>
+#include <linux/atomic.h>
 
 /*
  * This is an implementation of the notion of "decrement a
diff --git a/lib/fault-inject.c b/lib/fault-inject.c
index 7e65af70635e..f193b7796449 100644
--- a/lib/fault-inject.c
+++ b/lib/fault-inject.c
@@ -8,7 +8,6 @@
 #include <linux/module.h>
 #include <linux/interrupt.h>
 #include <linux/stacktrace.h>
-#include <linux/kallsyms.h>
 #include <linux/fault-inject.h>
 
 /*
@@ -140,16 +139,6 @@ static int debugfs_ul_set(void *data, u64 val)
         return 0;
 }
 
-#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
-static int debugfs_ul_set_MAX_STACK_TRACE_DEPTH(void *data, u64 val)
-{
-        *(unsigned long *)data =
-                val < MAX_STACK_TRACE_DEPTH ?
-                val : MAX_STACK_TRACE_DEPTH;
-        return 0;
-}
-#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
-
 static int debugfs_ul_get(void *data, u64 *val)
 {
         *val = *(unsigned long *)data;
@@ -165,16 +154,26 @@ static struct dentry *debugfs_create_ul(const char *name, mode_t mode,
 }
 
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
-DEFINE_SIMPLE_ATTRIBUTE(fops_ul_MAX_STACK_TRACE_DEPTH, debugfs_ul_get,
-                        debugfs_ul_set_MAX_STACK_TRACE_DEPTH, "%llu\n");
 
-static struct dentry *debugfs_create_ul_MAX_STACK_TRACE_DEPTH(
+static int debugfs_stacktrace_depth_set(void *data, u64 val)
+{
+        *(unsigned long *)data =
+                min_t(unsigned long, val, MAX_STACK_TRACE_DEPTH);
+
+        return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(fops_stacktrace_depth, debugfs_ul_get,
+                        debugfs_stacktrace_depth_set, "%llu\n");
+
+static struct dentry *debugfs_create_stacktrace_depth(
         const char *name, mode_t mode,
         struct dentry *parent, unsigned long *value)
 {
         return debugfs_create_file(name, mode, parent, value,
-                                   &fops_ul_MAX_STACK_TRACE_DEPTH);
+                                   &fops_stacktrace_depth);
 }
+
 #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
 
 static int debugfs_atomic_t_set(void *data, u64 val)
@@ -198,118 +197,51 @@ static struct dentry *debugfs_create_atomic_t(const char *name, mode_t mode,
         return debugfs_create_file(name, mode, parent, value, &fops_atomic_t);
 }
 
-void cleanup_fault_attr_dentries(struct fault_attr *attr)
-{
-        debugfs_remove(attr->dentries.probability_file);
-        attr->dentries.probability_file = NULL;
-
-        debugfs_remove(attr->dentries.interval_file);
-        attr->dentries.interval_file = NULL;
-
-        debugfs_remove(attr->dentries.times_file);
-        attr->dentries.times_file = NULL;
-
-        debugfs_remove(attr->dentries.space_file);
-        attr->dentries.space_file = NULL;
-
-        debugfs_remove(attr->dentries.verbose_file);
-        attr->dentries.verbose_file = NULL;
-
-        debugfs_remove(attr->dentries.task_filter_file);
-        attr->dentries.task_filter_file = NULL;
-
-#ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
-
-        debugfs_remove(attr->dentries.stacktrace_depth_file);
-        attr->dentries.stacktrace_depth_file = NULL;
-
-        debugfs_remove(attr->dentries.require_start_file);
-        attr->dentries.require_start_file = NULL;
-
-        debugfs_remove(attr->dentries.require_end_file);
-        attr->dentries.require_end_file = NULL;
-
-        debugfs_remove(attr->dentries.reject_start_file);
-        attr->dentries.reject_start_file = NULL;
-
-        debugfs_remove(attr->dentries.reject_end_file);
-        attr->dentries.reject_end_file = NULL;
-
-#endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
-
-        if (attr->dentries.dir)
-                WARN_ON(!simple_empty(attr->dentries.dir));
-
-        debugfs_remove(attr->dentries.dir);
-        attr->dentries.dir = NULL;
-}
-
-int init_fault_attr_dentries(struct fault_attr *attr, const char *name)
+struct dentry *fault_create_debugfs_attr(const char *name,
+                        struct dentry *parent, struct fault_attr *attr)
 {
         mode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
         struct dentry *dir;
 
-        memset(&attr->dentries, 0, sizeof(attr->dentries));
-
-        dir = debugfs_create_dir(name, NULL);
+        dir = debugfs_create_dir(name, parent);
         if (!dir)
-                goto fail;
-        attr->dentries.dir = dir;
-
-        attr->dentries.probability_file =
-                debugfs_create_ul("probability", mode, dir, &attr->probability);
+                return ERR_PTR(-ENOMEM);
 
-        attr->dentries.interval_file =
-                debugfs_create_ul("interval", mode, dir, &attr->interval);
-
-        attr->dentries.times_file =
-                debugfs_create_atomic_t("times", mode, dir, &attr->times);
-
-        attr->dentries.space_file =
-                debugfs_create_atomic_t("space", mode, dir, &attr->space);
-
-        attr->dentries.verbose_file =
-                debugfs_create_ul("verbose", mode, dir, &attr->verbose);
-
-        attr->dentries.task_filter_file = debugfs_create_bool("task-filter",
-                                                mode, dir, &attr->task_filter);
-
-        if (!attr->dentries.probability_file || !attr->dentries.interval_file ||
-            !attr->dentries.times_file || !attr->dentries.space_file ||
-            !attr->dentries.verbose_file || !attr->dentries.task_filter_file)
+        if (!debugfs_create_ul("probability", mode, dir, &attr->probability))
+                goto fail;
+        if (!debugfs_create_ul("interval", mode, dir, &attr->interval))
+                goto fail;
+        if (!debugfs_create_atomic_t("times", mode, dir, &attr->times))
+                goto fail;
+        if (!debugfs_create_atomic_t("space", mode, dir, &attr->space))
+                goto fail;
+        if (!debugfs_create_ul("verbose", mode, dir, &attr->verbose))
+                goto fail;
+        if (!debugfs_create_bool("task-filter", mode, dir, &attr->task_filter))
                 goto fail;
 
 #ifdef CONFIG_FAULT_INJECTION_STACKTRACE_FILTER
 
-        attr->dentries.stacktrace_depth_file =
-                debugfs_create_ul_MAX_STACK_TRACE_DEPTH(
-                        "stacktrace-depth", mode, dir, &attr->stacktrace_depth);
-
-        attr->dentries.require_start_file =
-                debugfs_create_ul("require-start", mode, dir, &attr->require_start);
-
-        attr->dentries.require_end_file =
-                debugfs_create_ul("require-end", mode, dir, &attr->require_end);
-
-        attr->dentries.reject_start_file =
-                debugfs_create_ul("reject-start", mode, dir, &attr->reject_start);
-
-        attr->dentries.reject_end_file =
-                debugfs_create_ul("reject-end", mode, dir, &attr->reject_end);
-
-        if (!attr->dentries.stacktrace_depth_file ||
-            !attr->dentries.require_start_file ||
-            !attr->dentries.require_end_file ||
-            !attr->dentries.reject_start_file ||
-            !attr->dentries.reject_end_file)
+        if (!debugfs_create_stacktrace_depth("stacktrace-depth", mode, dir,
+                                &attr->stacktrace_depth))
+                goto fail;
+        if (!debugfs_create_ul("require-start", mode, dir,
+                                &attr->require_start))
+                goto fail;
+        if (!debugfs_create_ul("require-end", mode, dir, &attr->require_end))
+                goto fail;
+        if (!debugfs_create_ul("reject-start", mode, dir, &attr->reject_start))
+                goto fail;
+        if (!debugfs_create_ul("reject-end", mode, dir, &attr->reject_end))
                 goto fail;
 
 #endif /* CONFIG_FAULT_INJECTION_STACKTRACE_FILTER */
 
-        return 0;
+        return dir;
 fail:
-        cleanup_fault_attr_dentries(attr);
-        return -ENOMEM;
+        debugfs_remove_recursive(dir);
+
+        return ERR_PTR(-ENOMEM);
 }
 
 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
diff --git a/lib/genalloc.c b/lib/genalloc.c
index 577ddf805975..f352cc42f4f8 100644
--- a/lib/genalloc.c
+++ b/lib/genalloc.c
@@ -1,8 +1,26 @@
 /*
- * Basic general purpose allocator for managing special purpose memory
- * not managed by the regular kmalloc/kfree interface.
- * Uses for this includes on-device special memory, uncached memory
- * etc.
+ * Basic general purpose allocator for managing special purpose
+ * memory, for example, memory that is not managed by the regular
+ * kmalloc/kfree interface.  Uses for this includes on-device special
+ * memory, uncached memory etc.
+ *
+ * It is safe to use the allocator in NMI handlers and other special
+ * unblockable contexts that could otherwise deadlock on locks.  This
+ * is implemented by using atomic operations and retries on any
+ * conflicts.  The disadvantage is that there may be livelocks in
+ * extreme cases.  For better scalability, one allocator can be used
+ * for each CPU.
+ *
+ * The lockless operation only works if there is enough memory
+ * available.  If new memory is added to the pool a lock has to be
+ * still taken.  So any user relying on locklessness has to ensure
+ * that sufficient memory is preallocated.
+ *
+ * The basic atomic operation of this allocator is cmpxchg on long.
+ * On architectures that don't have NMI-safe cmpxchg implementation,
+ * the allocator can NOT be used in NMI handler.  So code uses the
+ * allocator in NMI handler should depend on
+ * CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
  *
  * Copyright 2005 (C) Jes Sorensen <jes@trained-monkey.org>
  *
@@ -13,8 +31,109 @@
 #include <linux/slab.h>
 #include <linux/module.h>
 #include <linux/bitmap.h>
+#include <linux/rculist.h>
+#include <linux/interrupt.h>
 #include <linux/genalloc.h>
 
+static int set_bits_ll(unsigned long *addr, unsigned long mask_to_set)
+{
+        unsigned long val, nval;
+
+        nval = *addr;
+        do {
+                val = nval;
+                if (val & mask_to_set)
+                        return -EBUSY;
+                cpu_relax();
+        } while ((nval = cmpxchg(addr, val, val | mask_to_set)) != val);
+
+        return 0;
+}
+
+static int clear_bits_ll(unsigned long *addr, unsigned long mask_to_clear)
+{
+        unsigned long val, nval;
+
+        nval = *addr;
+        do {
+                val = nval;
+                if ((val & mask_to_clear) != mask_to_clear)
+                        return -EBUSY;
+                cpu_relax();
+        } while ((nval = cmpxchg(addr, val, val & ~mask_to_clear)) != val);
+
+        return 0;
+}
+
+/*
+ * bitmap_set_ll - set the specified number of bits at the specified position
+ * @map: pointer to a bitmap
+ * @start: a bit position in @map
+ * @nr: number of bits to set
+ *
+ * Set @nr bits start from @start in @map lock-lessly. Several users
+ * can set/clear the same bitmap simultaneously without lock. If two
+ * users set the same bit, one user will return remain bits, otherwise
+ * return 0.
+ */
+static int bitmap_set_ll(unsigned long *map, int start, int nr)
+{
+        unsigned long *p = map + BIT_WORD(start);
+        const int size = start + nr;
+        int bits_to_set = BITS_PER_LONG - (start % BITS_PER_LONG);
+        unsigned long mask_to_set = BITMAP_FIRST_WORD_MASK(start);
+
+        while (nr - bits_to_set >= 0) {
+                if (set_bits_ll(p, mask_to_set))
+                        return nr;
+                nr -= bits_to_set;
+                bits_to_set = BITS_PER_LONG;
+                mask_to_set = ~0UL;
+                p++;
+        }
+        if (nr) {
+                mask_to_set &= BITMAP_LAST_WORD_MASK(size);
+                if (set_bits_ll(p, mask_to_set))
+                        return nr;
+        }
+
+        return 0;
+}
+
+/*
+ * bitmap_clear_ll - clear the specified number of bits at the specified position
+ * @map: pointer to a bitmap
+ * @start: a bit position in @map
+ * @nr: number of bits to set
+ *
+ * Clear @nr bits start from @start in @map lock-lessly. Several users
+ * can set/clear the same bitmap simultaneously without lock. If two
+ * users clear the same bit, one user will return remain bits,
+ * otherwise return 0.
+ */
+static int bitmap_clear_ll(unsigned long *map, int start, int nr)
+{
+        unsigned long *p = map + BIT_WORD(start);
+        const int size = start + nr;
+        int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG);
+        unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start);
+
+        while (nr - bits_to_clear >= 0) {
+                if (clear_bits_ll(p, mask_to_clear))
+                        return nr;
+                nr -= bits_to_clear;
+                bits_to_clear = BITS_PER_LONG;
+                mask_to_clear = ~0UL;
+                p++;
+        }
+        if (nr) {
+                mask_to_clear &= BITMAP_LAST_WORD_MASK(size);
+                if (clear_bits_ll(p, mask_to_clear))
+                        return nr;
+        }
+
+        return 0;
+}
 
 /**
  * gen_pool_create - create a new special memory pool
@@ -30,7 +149,7 @@ struct gen_pool *gen_pool_create(int min_alloc_order, int nid)
 
         pool = kmalloc_node(sizeof(struct gen_pool), GFP_KERNEL, nid);
         if (pool != NULL) {
-                rwlock_init(&pool->lock);
+                spin_lock_init(&pool->lock);
                 INIT_LIST_HEAD(&pool->chunks);
                 pool->min_alloc_order = min_alloc_order;
         }
@@ -63,14 +182,14 @@ int gen_pool_add_virt(struct gen_pool *pool, unsigned long virt, phys_addr_t phy
         if (unlikely(chunk == NULL))
                 return -ENOMEM;
 
-        spin_lock_init(&chunk->lock);
         chunk->phys_addr = phys;
         chunk->start_addr = virt;
         chunk->end_addr = virt + size;
+        atomic_set(&chunk->avail, size);
 
-        write_lock(&pool->lock);
-        list_add(&chunk->next_chunk, &pool->chunks);
-        write_unlock(&pool->lock);
+        spin_lock(&pool->lock);
+        list_add_rcu(&chunk->next_chunk, &pool->chunks);
+        spin_unlock(&pool->lock);
 
         return 0;
 }
@@ -85,19 +204,19 @@ EXPORT_SYMBOL(gen_pool_add_virt);
  */
 phys_addr_t gen_pool_virt_to_phys(struct gen_pool *pool, unsigned long addr)
 {
-        struct list_head *_chunk;
         struct gen_pool_chunk *chunk;
+        phys_addr_t paddr = -1;
 
-        read_lock(&pool->lock);
-        list_for_each(_chunk, &pool->chunks) {
-                chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
-
-                if (addr >= chunk->start_addr && addr < chunk->end_addr)
-                        return chunk->phys_addr + addr - chunk->start_addr;
+        rcu_read_lock();
+        list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
+                if (addr >= chunk->start_addr && addr < chunk->end_addr) {
+                        paddr = chunk->phys_addr + (addr - chunk->start_addr);
+                        break;
+                }
         }
-        read_unlock(&pool->lock);
+        rcu_read_unlock();
 
-        return -1;
+        return paddr;
 }
 EXPORT_SYMBOL(gen_pool_virt_to_phys);
 
@@ -115,7 +234,6 @@ void gen_pool_destroy(struct gen_pool *pool)
         int order = pool->min_alloc_order;
         int bit, end_bit;
 
-
         list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
                 chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
                 list_del(&chunk->next_chunk);
@@ -137,44 +255,50 @@ EXPORT_SYMBOL(gen_pool_destroy);
  * @size: number of bytes to allocate from the pool
  *
  * Allocate the requested number of bytes from the specified pool.
- * Uses a first-fit algorithm.
+ * Uses a first-fit algorithm. Can not be used in NMI handler on
+ * architectures without NMI-safe cmpxchg implementation.
  */
 unsigned long gen_pool_alloc(struct gen_pool *pool, size_t size)
 {
-        struct list_head *_chunk;
         struct gen_pool_chunk *chunk;
-        unsigned long addr, flags;
+        unsigned long addr = 0;
         int order = pool->min_alloc_order;
-        int nbits, start_bit, end_bit;
+        int nbits, start_bit = 0, end_bit, remain;
+
+#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
+        BUG_ON(in_nmi());
+#endif
 
         if (size == 0)
                 return 0;
 
         nbits = (size + (1UL << order) - 1) >> order;
-
-        read_lock(&pool->lock);
-        list_for_each(_chunk, &pool->chunks) {
-                chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
+        rcu_read_lock();
+        list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
+                if (size > atomic_read(&chunk->avail))
+                        continue;
 
                 end_bit = (chunk->end_addr - chunk->start_addr) >> order;
-
-                spin_lock_irqsave(&chunk->lock, flags);
-                start_bit = bitmap_find_next_zero_area(chunk->bits, end_bit, 0,
-                                                nbits, 0);
-                if (start_bit >= end_bit) {
-                        spin_unlock_irqrestore(&chunk->lock, flags);
+retry:
+                start_bit = bitmap_find_next_zero_area(chunk->bits, end_bit,
+                                                       start_bit, nbits, 0);
+                if (start_bit >= end_bit)
                         continue;
+                remain = bitmap_set_ll(chunk->bits, start_bit, nbits);
+                if (remain) {
+                        remain = bitmap_clear_ll(chunk->bits, start_bit,
+                                                 nbits - remain);
+                        BUG_ON(remain);
+                        goto retry;
                 }
 
                 addr = chunk->start_addr + ((unsigned long)start_bit << order);
-
-                bitmap_set(chunk->bits, start_bit, nbits);
-                spin_unlock_irqrestore(&chunk->lock, flags);
-                read_unlock(&pool->lock);
-                return addr;
+                size = nbits << order;
+                atomic_sub(size, &chunk->avail);
+                break;
         }
-        read_unlock(&pool->lock);
-        return 0;
+        rcu_read_unlock();
+        return addr;
 }
 EXPORT_SYMBOL(gen_pool_alloc);
 
@@ -184,33 +308,95 @@ EXPORT_SYMBOL(gen_pool_alloc);
  * @addr: starting address of memory to free back to pool
  * @size: size in bytes of memory to free
  *
- * Free previously allocated special memory back to the specified pool.
+ * Free previously allocated special memory back to the specified
+ * pool.  Can not be used in NMI handler on architectures without
+ * NMI-safe cmpxchg implementation.
  */
 void gen_pool_free(struct gen_pool *pool, unsigned long addr, size_t size)
 {
-        struct list_head *_chunk;
         struct gen_pool_chunk *chunk;
-        unsigned long flags;
         int order = pool->min_alloc_order;
-        int bit, nbits;
+        int start_bit, nbits, remain;
 
-        nbits = (size + (1UL << order) - 1) >> order;
-
-        read_lock(&pool->lock);
-        list_for_each(_chunk, &pool->chunks) {
-                chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
+#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
+        BUG_ON(in_nmi());
+#endif
 
+        nbits = (size + (1UL << order) - 1) >> order;
+        rcu_read_lock();
+        list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk) {
                 if (addr >= chunk->start_addr && addr < chunk->end_addr) {
                         BUG_ON(addr + size > chunk->end_addr);
-                        spin_lock_irqsave(&chunk->lock, flags);
-                        bit = (addr - chunk->start_addr) >> order;
-                        while (nbits--)
-                                __clear_bit(bit++, chunk->bits);
-                        spin_unlock_irqrestore(&chunk->lock, flags);
-                        break;
+                        start_bit = (addr - chunk->start_addr) >> order;
+                        remain = bitmap_clear_ll(chunk->bits, start_bit, nbits);
+                        BUG_ON(remain);
+                        size = nbits << order;
+                        atomic_add(size, &chunk->avail);
+                        rcu_read_unlock();
+                        return;
                 }
         }
-        BUG_ON(nbits > 0);
-        read_unlock(&pool->lock);
+        rcu_read_unlock();
+        BUG();
 }
 EXPORT_SYMBOL(gen_pool_free);
+
+/**
+ * gen_pool_for_each_chunk - call func for every chunk of generic memory pool
+ * @pool:       the generic memory pool
+ * @func:       func to call
+ * @data:       additional data used by @func
+ *
+ * Call @func for every chunk of generic memory pool.  The @func is
+ * called with rcu_read_lock held.
+ */
+void gen_pool_for_each_chunk(struct gen_pool *pool,
+        void (*func)(struct gen_pool *pool, struct gen_pool_chunk *chunk, void *data),
+        void *data)
+{
+        struct gen_pool_chunk *chunk;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(chunk, &(pool)->chunks, next_chunk)
+                func(pool, chunk, data);
+        rcu_read_unlock();
+}
+EXPORT_SYMBOL(gen_pool_for_each_chunk);
+
+/**
+ * gen_pool_avail - get available free space of the pool
+ * @pool: pool to get available free space
+ *
+ * Return available free space of the specified pool.
+ */
+size_t gen_pool_avail(struct gen_pool *pool)
+{
+        struct gen_pool_chunk *chunk;
+        size_t avail = 0;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk)
+                avail += atomic_read(&chunk->avail);
+        rcu_read_unlock();
+        return avail;
+}
+EXPORT_SYMBOL_GPL(gen_pool_avail);
+
+/**
+ * gen_pool_size - get size in bytes of memory managed by the pool
+ * @pool: pool to get size
+ *
+ * Return size in bytes of memory managed by the pool.
+ */
+size_t gen_pool_size(struct gen_pool *pool)
+{
+        struct gen_pool_chunk *chunk;
+        size_t size = 0;
+
+        rcu_read_lock();
+        list_for_each_entry_rcu(chunk, &pool->chunks, next_chunk)
+                size += chunk->end_addr - chunk->start_addr;
+        rcu_read_unlock();
+        return size;
+}
+EXPORT_SYMBOL_GPL(gen_pool_size);
diff --git a/lib/idr.c b/lib/idr.c
index e0abbc177e30..5acf9bb10968 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -34,8 +34,10 @@
 #include <linux/err.h>
 #include <linux/string.h>
 #include <linux/idr.h>
+#include <linux/spinlock.h>
 
 static struct kmem_cache *idr_layer_cache;
+static DEFINE_SPINLOCK(simple_ida_lock);
 
 static struct idr_layer *get_from_free_list(struct idr *idp)
 {
@@ -926,6 +928,71 @@ void ida_destroy(struct ida *ida)
 EXPORT_SYMBOL(ida_destroy);
 
 /**
+ * ida_simple_get - get a new id.
+ * @ida: the (initialized) ida.
+ * @start: the minimum id (inclusive, < 0x8000000)
+ * @end: the maximum id (exclusive, < 0x8000000 or 0)
+ * @gfp_mask: memory allocation flags
+ *
+ * Allocates an id in the range start <= id < end, or returns -ENOSPC.
+ * On memory allocation failure, returns -ENOMEM.
+ *
+ * Use ida_simple_remove() to get rid of an id.
+ */
+int ida_simple_get(struct ida *ida, unsigned int start, unsigned int end,
+                   gfp_t gfp_mask)
+{
+        int ret, id;
+        unsigned int max;
+
+        BUG_ON((int)start < 0);
+        BUG_ON((int)end < 0);
+
+        if (end == 0)
+                max = 0x80000000;
+        else {
+                BUG_ON(end < start);
+                max = end - 1;
+        }
+
+again:
+        if (!ida_pre_get(ida, gfp_mask))
+                return -ENOMEM;
+
+        spin_lock(&simple_ida_lock);
+        ret = ida_get_new_above(ida, start, &id);
+        if (!ret) {
+                if (id > max) {
+                        ida_remove(ida, id);
+                        ret = -ENOSPC;
+                } else {
+                        ret = id;
+                }
+        }
+        spin_unlock(&simple_ida_lock);
+
+        if (unlikely(ret == -EAGAIN))
+                goto again;
+
+        return ret;
+}
+EXPORT_SYMBOL(ida_simple_get);
+
+/**
+ * ida_simple_remove - remove an allocated id.
+ * @ida: the (initialized) ida.
+ * @id: the id returned by ida_simple_get.
+ */
+void ida_simple_remove(struct ida *ida, unsigned int id)
+{
+        BUG_ON((int)id < 0);
+        spin_lock(&simple_ida_lock);
+        ida_remove(ida, id);
+        spin_unlock(&simple_ida_lock);
+}
+EXPORT_SYMBOL(ida_simple_remove);
+
+/**
  * ida_init - initialize ida handle
  * @ida:        ida handle
  *
diff --git a/lib/llist.c b/lib/llist.c
new file mode 100644
index 000000000000..da445724fa1f
--- /dev/null
+++ b/lib/llist.c
@@ -0,0 +1,129 @@
+/*
+ * Lock-less NULL terminated single linked list
+ *
+ * The basic atomic operation of this list is cmpxchg on long.  On
+ * architectures that don't have NMI-safe cmpxchg implementation, the
+ * list can NOT be used in NMI handler.  So code uses the list in NMI
+ * handler should depend on CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG.
+ *
+ * Copyright 2010,2011 Intel Corp.
+ *   Author: Huang Ying <ying.huang@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation;
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/interrupt.h>
+#include <linux/llist.h>
+
+#include <asm/system.h>
+
+/**
+ * llist_add - add a new entry
+ * @new:        new entry to be added
+ * @head:       the head for your lock-less list
+ */
+void llist_add(struct llist_node *new, struct llist_head *head)
+{
+        struct llist_node *entry, *old_entry;
+
+#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
+        BUG_ON(in_nmi());
+#endif
+
+        entry = head->first;
+        do {
+                old_entry = entry;
+                new->next = entry;
+                cpu_relax();
+        } while ((entry = cmpxchg(&head->first, old_entry, new)) != old_entry);
+}
+EXPORT_SYMBOL_GPL(llist_add);
+
+/**
+ * llist_add_batch - add several linked entries in batch
+ * @new_first:  first entry in batch to be added
+ * @new_last:   last entry in batch to be added
+ * @head:       the head for your lock-less list
+ */
+void llist_add_batch(struct llist_node *new_first, struct llist_node *new_last,
+                     struct llist_head *head)
+{
+        struct llist_node *entry, *old_entry;
+
+#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
+        BUG_ON(in_nmi());
+#endif
+
+        entry = head->first;
+        do {
+                old_entry = entry;
+                new_last->next = entry;
+                cpu_relax();
+        } while ((entry = cmpxchg(&head->first, old_entry, new_first)) != old_entry);
+}
+EXPORT_SYMBOL_GPL(llist_add_batch);
+
+/**
+ * llist_del_first - delete the first entry of lock-less list
+ * @head:       the head for your lock-less list
+ *
+ * If list is empty, return NULL, otherwise, return the first entry
+ * deleted, this is the newest added one.
+ *
+ * Only one llist_del_first user can be used simultaneously with
+ * multiple llist_add users without lock.  Because otherwise
+ * llist_del_first, llist_add, llist_add (or llist_del_all, llist_add,
+ * llist_add) sequence in another user may change @head->first->next,
+ * but keep @head->first.  If multiple consumers are needed, please
+ * use llist_del_all or use lock between consumers.
+ */
+struct llist_node *llist_del_first(struct llist_head *head)
+{
+        struct llist_node *entry, *old_entry, *next;
+
+#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
+        BUG_ON(in_nmi());
+#endif
+
+        entry = head->first;
+        do {
+                if (entry == NULL)
+                        return NULL;
+                old_entry = entry;
+                next = entry->next;
+                cpu_relax();
+        } while ((entry = cmpxchg(&head->first, old_entry, next)) != old_entry);
+
+        return entry;
+}
+EXPORT_SYMBOL_GPL(llist_del_first);
+
+/**
+ * llist_del_all - delete all entries from lock-less list
+ * @head:       the head of lock-less list to delete all entries
+ *
+ * If list is empty, return NULL, otherwise, delete all entries and
+ * return the pointer to the first entry.  The order of entries
+ * deleted is from the newest to the oldest added one.
+ */
+struct llist_node *llist_del_all(struct llist_head *head)
+{
+#ifndef CONFIG_ARCH_HAVE_NMI_SAFE_CMPXCHG
+        BUG_ON(in_nmi());
+#endif
+
+        return xchg(&head->first, NULL);
+}
+EXPORT_SYMBOL_GPL(llist_del_all);
diff --git a/lib/md5.c b/lib/md5.c
new file mode 100644
index 000000000000..c777180e1f2f
--- /dev/null
+++ b/lib/md5.c
@@ -0,0 +1,95 @@
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/cryptohash.h>
+
+#define F1(x, y, z)     (z ^ (x & (y ^ z)))
+#define F2(x, y, z)     F1(z, x, y)
+#define F3(x, y, z)     (x ^ y ^ z)
+#define F4(x, y, z)     (y ^ (x | ~z))
+
+#define MD5STEP(f, w, x, y, z, in, s) \
+        (w += f(x, y, z) + in, w = (w<<s | w>>(32-s)) + x)
+
+void md5_transform(__u32 *hash, __u32 const *in)
+{
+        u32 a, b, c, d;
+
+        a = hash[0];
+        b = hash[1];
+        c = hash[2];
+        d = hash[3];
+
+        MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
+        MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
+        MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
+        MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
+        MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
+        MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
+        MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
+        MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
+        MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
+        MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
+        MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
+        MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
+        MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
+        MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
+        MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
+        MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
+
+        MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
+        MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
+        MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
+        MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
+        MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
+        MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
+        MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
+        MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
+        MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
+        MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
+        MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
+        MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
+        MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
+        MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
+        MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
+        MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
+
+        MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
+        MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
+        MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
+        MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
+        MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
+        MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
+        MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
+        MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
+        MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
+        MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
+        MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
+        MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
+        MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
+        MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
+        MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
+        MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
+
+        MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
+        MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
+        MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
+        MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
+        MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
+        MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
+        MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
+        MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
+        MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
+        MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
+        MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
+        MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
+        MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
+        MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
+        MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
+        MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
+
+        hash[0] += a;
+        hash[1] += b;
+        hash[2] += c;
+        hash[3] += d;
+}
+EXPORT_SYMBOL(md5_transform);
diff --git a/lib/radix-tree.c b/lib/radix-tree.c
index 7ea2e033d715..a2f9da59c197 100644
--- a/lib/radix-tree.c
+++ b/lib/radix-tree.c
@@ -823,8 +823,8 @@ unsigned long radix_tree_prev_hole(struct radix_tree_root *root,
 EXPORT_SYMBOL(radix_tree_prev_hole);
 
 static unsigned int
-__lookup(struct radix_tree_node *slot, void ***results, unsigned long index,
-        unsigned int max_items, unsigned long *next_index)
+__lookup(struct radix_tree_node *slot, void ***results, unsigned long *indices,
+        unsigned long index, unsigned int max_items, unsigned long *next_index)
 {
         unsigned int nr_found = 0;
         unsigned int shift, height;
@@ -857,12 +857,16 @@ __lookup(struct radix_tree_node *slot, void ***results, unsigned long index,
 
         /* Bottom level: grab some items */
         for (i = index & RADIX_TREE_MAP_MASK; i < RADIX_TREE_MAP_SIZE; i++) {
-                index++;
                 if (slot->slots[i]) {
-                        results[nr_found++] = &(slot->slots[i]);
-                        if (nr_found == max_items)
+                        results[nr_found] = &(slot->slots[i]);
+                        if (indices)
+                                indices[nr_found] = index;
+                        if (++nr_found == max_items) {
+                                index++;
                                 goto out;
+                        }
                 }
+                index++;
         }
 out:
         *next_index = index;
@@ -918,8 +922,8 @@ radix_tree_gang_lookup(struct radix_tree_root *root, void **results,
 
                 if (cur_index > max_index)
                         break;
-                slots_found = __lookup(node, (void ***)results + ret, cur_index,
-                                        max_items - ret, &next_index);
+                slots_found = __lookup(node, (void ***)results + ret, NULL,
+                                cur_index, max_items - ret, &next_index);
                 nr_found = 0;
                 for (i = 0; i < slots_found; i++) {
                         struct radix_tree_node *slot;
@@ -944,6 +948,7 @@ EXPORT_SYMBOL(radix_tree_gang_lookup);
  *      radix_tree_gang_lookup_slot - perform multiple slot lookup on radix tree
  *      @root:          radix tree root
  *      @results:       where the results of the lookup are placed
+ *      @indices:       where their indices should be placed (but usually NULL)
  *      @first_index:   start the lookup from this key
  *      @max_items:     place up to this many items at *results
  *
@@ -958,7 +963,8 @@ EXPORT_SYMBOL(radix_tree_gang_lookup);
  *      protection, radix_tree_deref_slot may fail requiring a retry.
  */
 unsigned int
-radix_tree_gang_lookup_slot(struct radix_tree_root *root, void ***results,
+radix_tree_gang_lookup_slot(struct radix_tree_root *root,
+                        void ***results, unsigned long *indices,
                         unsigned long first_index, unsigned int max_items)
 {
         unsigned long max_index;
@@ -974,6 +980,8 @@ radix_tree_gang_lookup_slot(struct radix_tree_root *root, void ***results,
                 if (first_index > 0)
                         return 0;
                 results[0] = (void **)&root->rnode;
+                if (indices)
+                        indices[0] = 0;
                 return 1;
         }
         node = indirect_to_ptr(node);
@@ -987,8 +995,9 @@ radix_tree_gang_lookup_slot(struct radix_tree_root *root, void ***results,
 
                 if (cur_index > max_index)
                         break;
-                slots_found = __lookup(node, results + ret, cur_index,
-                                        max_items - ret, &next_index);
+                slots_found = __lookup(node, results + ret,
+                                indices ? indices + ret : NULL,
+                                cur_index, max_items - ret, &next_index);
                 ret += slots_found;
                 if (next_index == 0)
                         break;
@@ -1194,6 +1203,98 @@ radix_tree_gang_lookup_tag_slot(struct radix_tree_root *root, void ***results,
 }
 EXPORT_SYMBOL(radix_tree_gang_lookup_tag_slot);
 
+#if defined(CONFIG_SHMEM) && defined(CONFIG_SWAP)
+#include <linux/sched.h> /* for cond_resched() */
+
+/*
+ * This linear search is at present only useful to shmem_unuse_inode().
+ */
+static unsigned long __locate(struct radix_tree_node *slot, void *item,
+                              unsigned long index, unsigned long *found_index)
+{
+        unsigned int shift, height;
+        unsigned long i;
+
+        height = slot->height;
+        shift = (height-1) * RADIX_TREE_MAP_SHIFT;
+
+        for ( ; height > 1; height--) {
+                i = (index >> shift) & RADIX_TREE_MAP_MASK;
+                for (;;) {
+                        if (slot->slots[i] != NULL)
+                                break;
+                        index &= ~((1UL << shift) - 1);
+                        index += 1UL << shift;
+                        if (index == 0)
+                                goto out;       /* 32-bit wraparound */
+                        i++;
+                        if (i == RADIX_TREE_MAP_SIZE)
+                                goto out;
+                }
+
+                shift -= RADIX_TREE_MAP_SHIFT;
+                slot = rcu_dereference_raw(slot->slots[i]);
+                if (slot == NULL)
+                        goto out;
+        }
+
+        /* Bottom level: check items */
+        for (i = 0; i < RADIX_TREE_MAP_SIZE; i++) {
+                if (slot->slots[i] == item) {
+                        *found_index = index + i;
+                        index = 0;
+                        goto out;
+                }
+        }
+        index += RADIX_TREE_MAP_SIZE;
+out:
+        return index;
+}
+
+/**
+ *      radix_tree_locate_item - search through radix tree for item
+ *      @root:          radix tree root
+ *      @item:          item to be found
+ *
+ *      Returns index where item was found, or -1 if not found.
+ *      Caller must hold no lock (since this time-consuming function needs
+ *      to be preemptible), and must check afterwards if item is still there.
+ */
+unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item)
+{
+        struct radix_tree_node *node;
+        unsigned long max_index;
+        unsigned long cur_index = 0;
+        unsigned long found_index = -1;
+
+        do {
+                rcu_read_lock();
+                node = rcu_dereference_raw(root->rnode);
+                if (!radix_tree_is_indirect_ptr(node)) {
+                        rcu_read_unlock();
+                        if (node == item)
+                                found_index = 0;
+                        break;
+                }
+
+                node = indirect_to_ptr(node);
+                max_index = radix_tree_maxindex(node->height);
+                if (cur_index > max_index)
+                        break;
+
+                cur_index = __locate(node, item, cur_index, &found_index);
+                rcu_read_unlock();
+                cond_resched();
+        } while (cur_index != 0 && cur_index <= max_index);
+
+        return found_index;
+}
+#else
+unsigned long radix_tree_locate_item(struct radix_tree_root *root, void *item)
+{
+        return -1;
+}
+#endif /* CONFIG_SHMEM && CONFIG_SWAP */
 
 /**
  *      radix_tree_shrink    -    shrink height of a radix tree to minimal
diff --git a/lib/sha1.c b/lib/sha1.c
index 4c45fd50e913..1de509a159c8 100644
--- a/lib/sha1.c
+++ b/lib/sha1.c
@@ -1,31 +1,73 @@
 /*
- * SHA transform algorithm, originally taken from code written by
- * Peter Gutmann, and placed in the public domain.
+ * SHA1 routine optimized to do word accesses rather than byte accesses,
+ * and to avoid unnecessary copies into the context array.
+ *
+ * This was based on the git SHA1 implementation.
  */
 
 #include <linux/kernel.h>
 #include <linux/module.h>
+#include <linux/bitops.h>
 #include <linux/cryptohash.h>
+#include <asm/unaligned.h>
 
-/* The SHA f()-functions.  */
+/*
+ * If you have 32 registers or more, the compiler can (and should)
+ * try to change the array[] accesses into registers. However, on
+ * machines with less than ~25 registers, that won't really work,
+ * and at least gcc will make an unholy mess of it.
+ *
+ * So to avoid that mess which just slows things down, we force
+ * the stores to memory to actually happen (we might be better off
+ * with a 'W(t)=(val);asm("":"+m" (W(t))' there instead, as
+ * suggested by Artur Skawina - that will also make gcc unable to
+ * try to do the silly "optimize away loads" part because it won't
+ * see what the value will be).
+ *
+ * Ben Herrenschmidt reports that on PPC, the C version comes close
+ * to the optimized asm with this (ie on PPC you don't want that
+ * 'volatile', since there are lots of registers).
+ *
+ * On ARM we get the best code generation by forcing a full memory barrier
+ * between each SHA_ROUND, otherwise gcc happily get wild with spilling and
+ * the stack frame size simply explode and performance goes down the drain.
+ */
 
-#define f1(x,y,z)   (z ^ (x & (y ^ z)))         /* x ? y : z */
-#define f2(x,y,z)   (x ^ y ^ z)                 /* XOR */
-#define f3(x,y,z)   ((x & y) + (z & (x ^ y)))   /* majority */
+#ifdef CONFIG_X86
+  #define setW(x, val) (*(volatile __u32 *)&W(x) = (val))
+#elif defined(CONFIG_ARM)
+  #define setW(x, val) do { W(x) = (val); __asm__("":::"memory"); } while (0)
+#else
+  #define setW(x, val) (W(x) = (val))
+#endif
 
-/* The SHA Mysterious Constants */
+/* This "rolls" over the 512-bit array */
+#define W(x) (array[(x)&15])
 
-#define K1  0x5A827999L                 /* Rounds  0-19: sqrt(2) * 2^30 */
-#define K2  0x6ED9EBA1L                 /* Rounds 20-39: sqrt(3) * 2^30 */
-#define K3  0x8F1BBCDCL                 /* Rounds 40-59: sqrt(5) * 2^30 */
-#define K4  0xCA62C1D6L                 /* Rounds 60-79: sqrt(10) * 2^30 */
+/*
+ * Where do we get the source from? The first 16 iterations get it from
+ * the input data, the next mix it from the 512-bit array.
+ */
+#define SHA_SRC(t) get_unaligned_be32((__u32 *)data + t)
+#define SHA_MIX(t) rol32(W(t+13) ^ W(t+8) ^ W(t+2) ^ W(t), 1)
+
+#define SHA_ROUND(t, input, fn, constant, A, B, C, D, E) do { \
+        __u32 TEMP = input(t); setW(t, TEMP); \
+        E += TEMP + rol32(A,5) + (fn) + (constant); \
+        B = ror32(B, 2); } while (0)
+
+#define T_0_15(t, A, B, C, D, E)  SHA_ROUND(t, SHA_SRC, (((C^D)&B)^D) , 0x5a827999, A, B, C, D, E )
+#define T_16_19(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (((C^D)&B)^D) , 0x5a827999, A, B, C, D, E )
+#define T_20_39(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (B^C^D) , 0x6ed9eba1, A, B, C, D, E )
+#define T_40_59(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, ((B&C)+(D&(B^C))) , 0x8f1bbcdc, A, B, C, D, E )
+#define T_60_79(t, A, B, C, D, E) SHA_ROUND(t, SHA_MIX, (B^C^D) ,  0xca62c1d6, A, B, C, D, E )
 
 /**
  * sha_transform - single block SHA1 transform
  *
  * @digest: 160 bit digest to update
  * @data:   512 bits of data to hash
- * @W:      80 words of workspace (see note)
+ * @array:  16 words of workspace (see note)
  *
  * This function generates a SHA1 digest for a single 512-bit block.
  * Be warned, it does not handle padding and message digest, do not
@@ -36,47 +78,111 @@
  * to clear the workspace. This is left to the caller to avoid
  * unnecessary clears between chained hashing operations.
  */
-void sha_transform(__u32 *digest, const char *in, __u32 *W)
+void sha_transform(__u32 *digest, const char *data, __u32 *array)
 {
-        __u32 a, b, c, d, e, t, i;
-
-        for (i = 0; i < 16; i++)
-                W[i] = be32_to_cpu(((const __be32 *)in)[i]);
-
-        for (i = 0; i < 64; i++)
-                W[i+16] = rol32(W[i+13] ^ W[i+8] ^ W[i+2] ^ W[i], 1);
-
-        a = digest[0];
-        b = digest[1];
-        c = digest[2];
-        d = digest[3];
-        e = digest[4];
-
-        for (i = 0; i < 20; i++) {
-                t = f1(b, c, d) + K1 + rol32(a, 5) + e + W[i];
-                e = d; d = c; c = rol32(b, 30); b = a; a = t;
-        }
-
-        for (; i < 40; i ++) {
-                t = f2(b, c, d) + K2 + rol32(a, 5) + e + W[i];
-                e = d; d = c; c = rol32(b, 30); b = a; a = t;
-        }
-
-        for (; i < 60; i ++) {
-                t = f3(b, c, d) + K3 + rol32(a, 5) + e + W[i];
-                e = d; d = c; c = rol32(b, 30); b = a; a = t;
-        }
-
-        for (; i < 80; i ++) {
-                t = f2(b, c, d) + K4 + rol32(a, 5) + e + W[i];
-                e = d; d = c; c = rol32(b, 30); b = a; a = t;
-        }
-
-        digest[0] += a;
-        digest[1] += b;
-        digest[2] += c;
-        digest[3] += d;
-        digest[4] += e;
+        __u32 A, B, C, D, E;
+
+        A = digest[0];
+        B = digest[1];
+        C = digest[2];
+        D = digest[3];
+        E = digest[4];
+
+        /* Round 1 - iterations 0-16 take their input from 'data' */
+        T_0_15( 0, A, B, C, D, E);
+        T_0_15( 1, E, A, B, C, D);
+        T_0_15( 2, D, E, A, B, C);
+        T_0_15( 3, C, D, E, A, B);
+        T_0_15( 4, B, C, D, E, A);
+        T_0_15( 5, A, B, C, D, E);
+        T_0_15( 6, E, A, B, C, D);
+        T_0_15( 7, D, E, A, B, C);
+        T_0_15( 8, C, D, E, A, B);
+        T_0_15( 9, B, C, D, E, A);
+        T_0_15(10, A, B, C, D, E);
+        T_0_15(11, E, A, B, C, D);
+        T_0_15(12, D, E, A, B, C);
+        T_0_15(13, C, D, E, A, B);
+        T_0_15(14, B, C, D, E, A);
+        T_0_15(15, A, B, C, D, E);
+
+        /* Round 1 - tail. Input from 512-bit mixing array */
+        T_16_19(16, E, A, B, C, D);
+        T_16_19(17, D, E, A, B, C);
+        T_16_19(18, C, D, E, A, B);
+        T_16_19(19, B, C, D, E, A);
+
+        /* Round 2 */
+        T_20_39(20, A, B, C, D, E);
+        T_20_39(21, E, A, B, C, D);
+        T_20_39(22, D, E, A, B, C);
+        T_20_39(23, C, D, E, A, B);
+        T_20_39(24, B, C, D, E, A);
+        T_20_39(25, A, B, C, D, E);
+        T_20_39(26, E, A, B, C, D);
+        T_20_39(27, D, E, A, B, C);
+        T_20_39(28, C, D, E, A, B);
+        T_20_39(29, B, C, D, E, A);
+        T_20_39(30, A, B, C, D, E);
+        T_20_39(31, E, A, B, C, D);
+        T_20_39(32, D, E, A, B, C);
+        T_20_39(33, C, D, E, A, B);
+        T_20_39(34, B, C, D, E, A);
+        T_20_39(35, A, B, C, D, E);
+        T_20_39(36, E, A, B, C, D);
+        T_20_39(37, D, E, A, B, C);
+        T_20_39(38, C, D, E, A, B);
+        T_20_39(39, B, C, D, E, A);
+
+        /* Round 3 */
+        T_40_59(40, A, B, C, D, E);
+        T_40_59(41, E, A, B, C, D);
+        T_40_59(42, D, E, A, B, C);
+        T_40_59(43, C, D, E, A, B);
+        T_40_59(44, B, C, D, E, A);
+        T_40_59(45, A, B, C, D, E);
+        T_40_59(46, E, A, B, C, D);
+        T_40_59(47, D, E, A, B, C);
+        T_40_59(48, C, D, E, A, B);
+        T_40_59(49, B, C, D, E, A);
+        T_40_59(50, A, B, C, D, E);
+        T_40_59(51, E, A, B, C, D);
+        T_40_59(52, D, E, A, B, C);
+        T_40_59(53, C, D, E, A, B);
+        T_40_59(54, B, C, D, E, A);
+        T_40_59(55, A, B, C, D, E);
+        T_40_59(56, E, A, B, C, D);
+        T_40_59(57, D, E, A, B, C);
+        T_40_59(58, C, D, E, A, B);
+        T_40_59(59, B, C, D, E, A);
+
+        /* Round 4 */
+        T_60_79(60, A, B, C, D, E);
+        T_60_79(61, E, A, B, C, D);
+        T_60_79(62, D, E, A, B, C);
+        T_60_79(63, C, D, E, A, B);
+        T_60_79(64, B, C, D, E, A);
+        T_60_79(65, A, B, C, D, E);
+        T_60_79(66, E, A, B, C, D);
+        T_60_79(67, D, E, A, B, C);
+        T_60_79(68, C, D, E, A, B);
+        T_60_79(69, B, C, D, E, A);
+        T_60_79(70, A, B, C, D, E);
+        T_60_79(71, E, A, B, C, D);
+        T_60_79(72, D, E, A, B, C);
+        T_60_79(73, C, D, E, A, B);
+        T_60_79(74, B, C, D, E, A);
+        T_60_79(75, A, B, C, D, E);
+        T_60_79(76, E, A, B, C, D);
+        T_60_79(77, D, E, A, B, C);
+        T_60_79(78, C, D, E, A, B);
+        T_60_79(79, B, C, D, E, A);
+
+        digest[0] += A;
+        digest[1] += B;
+        digest[2] += C;
+        digest[3] += D;
+        digest[4] += E;
 }
 EXPORT_SYMBOL(sha_transform);
 
@@ -92,4 +198,3 @@ void sha_init(__u32 *buf)
         buf[3] = 0x10325476;
         buf[4] = 0xc3d2e1f0;
 }
-