Merge branch 'origin' into devel

Conflicts:
	sound/soc/pxa/pxa2xx-i2s.c

9 files changed, 1337 insertions, 458 deletions

diff --git a/lib/Kconfig b/lib/Kconfig
index 03c2c24b9083..54aaf4feaf6c 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -136,12 +136,6 @@ config TEXTSEARCH_BM
 config TEXTSEARCH_FSM
         tristate
 
-#
-# plist support is select#ed if needed
-#
-config PLIST
-        boolean
-
 config HAS_IOMEM
         boolean
         depends on !NO_IOMEM
@@ -174,4 +168,10 @@ config DISABLE_OBSOLETE_CPUMASK_FUNCTIONS
        bool "Disable obsolete cpumask functions" if DEBUG_PER_CPU_MAPS
        depends on EXPERIMENTAL && BROKEN
 
+#
+# Netlink attribute parsing support is select'ed if needed
+#
+config NLATTR
+        bool
+
 endmenu
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index c536b37a11cc..0626fa4856e6 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -847,60 +847,70 @@ config BUILD_DOCSRC
 
           Say N if you are unsure.
 
-config DYNAMIC_PRINTK_DEBUG
-        bool "Enable dynamic printk() call support"
+config DYNAMIC_DEBUG
+        bool "Enable dynamic printk() support"
         default n
         depends on PRINTK
+        depends on DEBUG_FS
         select PRINTK_DEBUG
         help
 
           Compiles debug level messages into the kernel, which would not
           otherwise be available at runtime. These messages can then be
-          enabled/disabled on a per module basis. This mechanism implicitly
-          enables all pr_debug() and dev_dbg() calls. The impact of this
-          compile option is a larger kernel text size of about 2%.
+          enabled/disabled based on various levels of scope - per source file,
+          function, module, format string, and line number. This mechanism
+          implicitly enables all pr_debug() and dev_dbg() calls. The impact of
+          this compile option is a larger kernel text size of about 2%.
 
           Usage:
 
-          Dynamic debugging is controlled by the debugfs file,
-          dynamic_printk/modules. This file contains a list of the modules that
-          can be enabled. The format of the file is the module name, followed
-          by a set of flags that can be enabled. The first flag is always the
-          'enabled' flag. For example:
+          Dynamic debugging is controlled via the 'dynamic_debug/ddebug' file,
+          which is contained in the 'debugfs' filesystem. Thus, the debugfs
+          filesystem must first be mounted before making use of this feature.
+          We refer the control file as: <debugfs>/dynamic_debug/ddebug. This
+          file contains a list of the debug statements that can be enabled. The
+          format for each line of the file is:
 
-                <module_name> <enabled=0/1>
-                                .
-                                .
-                                .
+                filename:lineno [module]function flags format
 
-          <module_name> : Name of the module in which the debug call resides
-          <enabled=0/1> : whether the messages are enabled or not
+          filename : source file of the debug statement
+          lineno : line number of the debug statement
+          module : module that contains the debug statement
+          function : function that contains the debug statement
+          flags : 'p' means the line is turned 'on' for printing
+          format : the format used for the debug statement
 
           From a live system:
 
-                snd_hda_intel enabled=0
-                fixup enabled=0
-                driver enabled=0
+                nullarbor:~ # cat <debugfs>/dynamic_debug/ddebug
+                # filename:lineno [module]function flags format
+                fs/aio.c:222 [aio]__put_ioctx - "__put_ioctx:\040freeing\040%p\012"
+                fs/aio.c:248 [aio]ioctx_alloc - "ENOMEM:\040nr_events\040too\040high\012"
+                fs/aio.c:1770 [aio]sys_io_cancel - "calling\040cancel\012"
 
-          Enable a module:
+          Example usage:
 
-                $echo "set enabled=1 <module_name>" > dynamic_printk/modules
+                // enable the message at line 1603 of file svcsock.c
+                nullarbor:~ # echo -n 'file svcsock.c line 1603 +p' >
+                                                <debugfs>/dynamic_debug/ddebug
 
-          Disable a module:
+                // enable all the messages in file svcsock.c
+                nullarbor:~ # echo -n 'file svcsock.c +p' >
+                                                <debugfs>/dynamic_debug/ddebug
 
-                $echo "set enabled=0 <module_name>" > dynamic_printk/modules
+                // enable all the messages in the NFS server module
+                nullarbor:~ # echo -n 'module nfsd +p' >
+                                                <debugfs>/dynamic_debug/ddebug
 
-          Enable all modules:
+                // enable all 12 messages in the function svc_process()
+                nullarbor:~ # echo -n 'func svc_process +p' >
+                                                <debugfs>/dynamic_debug/ddebug
 
-                $echo "set enabled=1 all" > dynamic_printk/modules
+                // disable all 12 messages in the function svc_process()
+                nullarbor:~ # echo -n 'func svc_process -p' >
+                                                <debugfs>/dynamic_debug/ddebug
 
-          Disable all modules:
-
-                $echo "set enabled=0 all" > dynamic_printk/modules
-
-          Finally, passing "dynamic_printk" at the command line enables
-          debugging for all modules. This mode can be turned off via the above
-          disable command.
+          See Documentation/dynamic-debug-howto.txt for additional information.
 
 source "samples/Kconfig"
 
diff --git a/lib/Makefile b/lib/Makefile
index 32b0e64ded27..8bdc647e6d62 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -11,7 +11,8 @@ lib-y := ctype.o string.o vsprintf.o cmdline.o \
          rbtree.o radix-tree.o dump_stack.o \
          idr.o int_sqrt.o extable.o prio_tree.o \
          sha1.o irq_regs.o reciprocal_div.o argv_split.o \
-         proportions.o prio_heap.o ratelimit.o show_mem.o is_single_threaded.o
+         proportions.o prio_heap.o ratelimit.o show_mem.o \
+         is_single_threaded.o plist.o
 
 lib-$(CONFIG_MMU) += ioremap.o
 lib-$(CONFIG_SMP) += cpumask.o
@@ -40,7 +41,6 @@ lib-$(CONFIG_GENERIC_FIND_NEXT_BIT) += find_next_bit.o
 lib-$(CONFIG_GENERIC_FIND_LAST_BIT) += find_last_bit.o
 obj-$(CONFIG_GENERIC_HWEIGHT) += hweight.o
 obj-$(CONFIG_LOCK_KERNEL) += kernel_lock.o
-obj-$(CONFIG_PLIST) += plist.o
 obj-$(CONFIG_DEBUG_PREEMPT) += smp_processor_id.o
 obj-$(CONFIG_DEBUG_LIST) += list_debug.o
 obj-$(CONFIG_DEBUG_OBJECTS) += debugobjects.o
@@ -82,7 +82,9 @@ obj-$(CONFIG_HAVE_LMB) += lmb.o
 
 obj-$(CONFIG_HAVE_ARCH_TRACEHOOK) += syscall.o
 
-obj-$(CONFIG_DYNAMIC_PRINTK_DEBUG) += dynamic_printk.o
+obj-$(CONFIG_DYNAMIC_DEBUG) += dynamic_debug.o
+
+obj-$(CONFIG_NLATTR) += nlattr.o
 
 hostprogs-y     := gen_crc32table
 clean-files     := crc32table.h
diff --git a/lib/dynamic_debug.c b/lib/dynamic_debug.c
new file mode 100644
index 000000000000..833139ce1e22
--- /dev/null
+++ b/lib/dynamic_debug.c
@@ -0,0 +1,769 @@
+/*
+ * lib/dynamic_debug.c
+ *
+ * make pr_debug()/dev_dbg() calls runtime configurable based upon their
+ * source module.
+ *
+ * Copyright (C) 2008 Jason Baron <jbaron@redhat.com>
+ * By Greg Banks <gnb@melbourne.sgi.com>
+ * Copyright (c) 2008 Silicon Graphics Inc.  All Rights Reserved.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/kallsyms.h>
+#include <linux/version.h>
+#include <linux/types.h>
+#include <linux/mutex.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <linux/list.h>
+#include <linux/sysctl.h>
+#include <linux/ctype.h>
+#include <linux/uaccess.h>
+#include <linux/dynamic_debug.h>
+#include <linux/debugfs.h>
+
+extern struct _ddebug __start___verbose[];
+extern struct _ddebug __stop___verbose[];
+
+/* dynamic_debug_enabled, and dynamic_debug_enabled2 are bitmasks in which
+ * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
+ * use independent hash functions, to reduce the chance of false positives.
+ */
+long long dynamic_debug_enabled;
+EXPORT_SYMBOL_GPL(dynamic_debug_enabled);
+long long dynamic_debug_enabled2;
+EXPORT_SYMBOL_GPL(dynamic_debug_enabled2);
+
+struct ddebug_table {
+        struct list_head link;
+        char *mod_name;
+        unsigned int num_ddebugs;
+        unsigned int num_enabled;
+        struct _ddebug *ddebugs;
+};
+
+struct ddebug_query {
+        const char *filename;
+        const char *module;
+        const char *function;
+        const char *format;
+        unsigned int first_lineno, last_lineno;
+};
+
+struct ddebug_iter {
+        struct ddebug_table *table;
+        unsigned int idx;
+};
+
+static DEFINE_MUTEX(ddebug_lock);
+static LIST_HEAD(ddebug_tables);
+static int verbose = 0;
+
+/* Return the last part of a pathname */
+static inline const char *basename(const char *path)
+{
+        const char *tail = strrchr(path, '/');
+        return tail ? tail+1 : path;
+}
+
+/* format a string into buf[] which describes the _ddebug's flags */
+static char *ddebug_describe_flags(struct _ddebug *dp, char *buf,
+                                    size_t maxlen)
+{
+        char *p = buf;
+
+        BUG_ON(maxlen < 4);
+        if (dp->flags & _DPRINTK_FLAGS_PRINT)
+                *p++ = 'p';
+        if (p == buf)
+                *p++ = '-';
+        *p = '\0';
+
+        return buf;
+}
+
+/*
+ * must be called with ddebug_lock held
+ */
+
+static int disabled_hash(char hash, bool first_table)
+{
+        struct ddebug_table *dt;
+        char table_hash_value;
+
+        list_for_each_entry(dt, &ddebug_tables, link) {
+                if (first_table)
+                        table_hash_value = dt->ddebugs->primary_hash;
+                else
+                        table_hash_value = dt->ddebugs->secondary_hash;
+                if (dt->num_enabled && (hash == table_hash_value))
+                        return 0;
+        }
+        return 1;
+}
+
+/*
+ * Search the tables for _ddebug's which match the given
+ * `query' and apply the `flags' and `mask' to them.  Tells
+ * the user which ddebug's were changed, or whether none
+ * were matched.
+ */
+static void ddebug_change(const struct ddebug_query *query,
+                           unsigned int flags, unsigned int mask)
+{
+        int i;
+        struct ddebug_table *dt;
+        unsigned int newflags;
+        unsigned int nfound = 0;
+        char flagbuf[8];
+
+        /* search for matching ddebugs */
+        mutex_lock(&ddebug_lock);
+        list_for_each_entry(dt, &ddebug_tables, link) {
+
+                /* match against the module name */
+                if (query->module != NULL &&
+                    strcmp(query->module, dt->mod_name))
+                        continue;
+
+                for (i = 0 ; i < dt->num_ddebugs ; i++) {
+                        struct _ddebug *dp = &dt->ddebugs[i];
+
+                        /* match against the source filename */
+                        if (query->filename != NULL &&
+                            strcmp(query->filename, dp->filename) &&
+                            strcmp(query->filename, basename(dp->filename)))
+                                continue;
+
+                        /* match against the function */
+                        if (query->function != NULL &&
+                            strcmp(query->function, dp->function))
+                                continue;
+
+                        /* match against the format */
+                        if (query->format != NULL &&
+                            strstr(dp->format, query->format) == NULL)
+                                continue;
+
+                        /* match against the line number range */
+                        if (query->first_lineno &&
+                            dp->lineno < query->first_lineno)
+                                continue;
+                        if (query->last_lineno &&
+                            dp->lineno > query->last_lineno)
+                                continue;
+
+                        nfound++;
+
+                        newflags = (dp->flags & mask) | flags;
+                        if (newflags == dp->flags)
+                                continue;
+
+                        if (!newflags)
+                                dt->num_enabled--;
+                        else if (!dp-flags)
+                                dt->num_enabled++;
+                        dp->flags = newflags;
+                        if (newflags) {
+                                dynamic_debug_enabled |=
+                                                (1LL << dp->primary_hash);
+                                dynamic_debug_enabled2 |=
+                                                (1LL << dp->secondary_hash);
+                        } else {
+                                if (disabled_hash(dp->primary_hash, true))
+                                        dynamic_debug_enabled &=
+                                                ~(1LL << dp->primary_hash);
+                                if (disabled_hash(dp->secondary_hash, false))
+                                        dynamic_debug_enabled2 &=
+                                                ~(1LL << dp->secondary_hash);
+                        }
+                        if (verbose)
+                                printk(KERN_INFO
+                                        "ddebug: changed %s:%d [%s]%s %s\n",
+                                        dp->filename, dp->lineno,
+                                        dt->mod_name, dp->function,
+                                        ddebug_describe_flags(dp, flagbuf,
+                                                        sizeof(flagbuf)));
+                }
+        }
+        mutex_unlock(&ddebug_lock);
+
+        if (!nfound && verbose)
+                printk(KERN_INFO "ddebug: no matches for query\n");
+}
+
+/*
+ * Split the buffer `buf' into space-separated words.
+ * Handles simple " and ' quoting, i.e. without nested,
+ * embedded or escaped \".  Return the number of words
+ * or <0 on error.
+ */
+static int ddebug_tokenize(char *buf, char *words[], int maxwords)
+{
+        int nwords = 0;
+
+        while (*buf) {
+                char *end;
+
+                /* Skip leading whitespace */
+                while (*buf && isspace(*buf))
+                        buf++;
+                if (!*buf)
+                        break;  /* oh, it was trailing whitespace */
+
+                /* Run `end' over a word, either whitespace separated or quoted */
+                if (*buf == '"' || *buf == '\'') {
+                        int quote = *buf++;
+                        for (end = buf ; *end && *end != quote ; end++)
+                                ;
+                        if (!*end)
+                                return -EINVAL; /* unclosed quote */
+                } else {
+                        for (end = buf ; *end && !isspace(*end) ; end++)
+                                ;
+                        BUG_ON(end == buf);
+                }
+                /* Here `buf' is the start of the word, `end' is one past the end */
+
+                if (nwords == maxwords)
+                        return -EINVAL; /* ran out of words[] before bytes */
+                if (*end)
+                        *end++ = '\0';  /* terminate the word */
+                words[nwords++] = buf;
+                buf = end;
+        }
+
+        if (verbose) {
+                int i;
+                printk(KERN_INFO "%s: split into words:", __func__);
+                for (i = 0 ; i < nwords ; i++)
+                        printk(" \"%s\"", words[i]);
+                printk("\n");
+        }
+
+        return nwords;
+}
+
+/*
+ * Parse a single line number.  Note that the empty string ""
+ * is treated as a special case and converted to zero, which
+ * is later treated as a "don't care" value.
+ */
+static inline int parse_lineno(const char *str, unsigned int *val)
+{
+        char *end = NULL;
+        BUG_ON(str == NULL);
+        if (*str == '\0') {
+                *val = 0;
+                return 0;
+        }
+        *val = simple_strtoul(str, &end, 10);
+        return end == NULL || end == str || *end != '\0' ? -EINVAL : 0;
+}
+
+/*
+ * Undo octal escaping in a string, inplace.  This is useful to
+ * 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;
+        char *out = str;
+
+        while (*in) {
+                if (*in == '\\') {
+                        if (in[1] == '\\') {
+                                *out++ = '\\';
+                                in += 2;
+                                continue;
+                        } else if (in[1] == 't') {
+                                *out++ = '\t';
+                                in += 2;
+                                continue;
+                        } else if (in[1] == 'n') {
+                                *out++ = '\n';
+                                in += 2;
+                                continue;
+                        } else if (isodigit(in[1]) &&
+                                 isodigit(in[2]) &&
+                                 isodigit(in[3])) {
+                                *out++ = ((in[1] - '0')<<6) |
+                                          ((in[2] - '0')<<3) |
+                                          (in[3] - '0');
+                                in += 4;
+                                continue;
+                        }
+                }
+                *out++ = *in++;
+        }
+        *out = '\0';
+
+        return str;
+}
+
+/*
+ * Parse words[] as a ddebug query specification, which is a series
+ * of (keyword, value) pairs chosen from these possibilities:
+ *
+ * func <function-name>
+ * file <full-pathname>
+ * file <base-filename>
+ * module <module-name>
+ * format <escaped-string-to-find-in-format>
+ * line <lineno>
+ * line <first-lineno>-<last-lineno> // where either may be empty
+ */
+static int ddebug_parse_query(char *words[], int nwords,
+                               struct ddebug_query *query)
+{
+        unsigned int i;
+
+        /* check we have an even number of words */
+        if (nwords % 2 != 0)
+                return -EINVAL;
+        memset(query, 0, sizeof(*query));
+
+        for (i = 0 ; i < nwords ; i += 2) {
+                if (!strcmp(words[i], "func"))
+                        query->function = words[i+1];
+                else if (!strcmp(words[i], "file"))
+                        query->filename = words[i+1];
+                else if (!strcmp(words[i], "module"))
+                        query->module = words[i+1];
+                else if (!strcmp(words[i], "format"))
+                        query->format = unescape(words[i+1]);
+                else if (!strcmp(words[i], "line")) {
+                        char *first = words[i+1];
+                        char *last = strchr(first, '-');
+                        if (last)
+                                *last++ = '\0';
+                        if (parse_lineno(first, &query->first_lineno) < 0)
+                                return -EINVAL;
+                        if (last != NULL) {
+                                /* range <first>-<last> */
+                                if (parse_lineno(last, &query->last_lineno) < 0)
+                                        return -EINVAL;
+                        } else {
+                                query->last_lineno = query->first_lineno;
+                        }
+                } else {
+                        if (verbose)
+                                printk(KERN_ERR "%s: unknown keyword \"%s\"\n",
+                                        __func__, words[i]);
+                        return -EINVAL;
+                }
+        }
+
+        if (verbose)
+                printk(KERN_INFO "%s: q->function=\"%s\" q->filename=\"%s\" "
+                       "q->module=\"%s\" q->format=\"%s\" q->lineno=%u-%u\n",
+                        __func__, query->function, query->filename,
+                        query->module, query->format, query->first_lineno,
+                        query->last_lineno);
+
+        return 0;
+}
+
+/*
+ * Parse `str' as a flags specification, format [-+=][p]+.
+ * Sets up *maskp and *flagsp to be used when changing the
+ * flags fields of matched _ddebug's.  Returns 0 on success
+ * or <0 on error.
+ */
+static int ddebug_parse_flags(const char *str, unsigned int *flagsp,
+                               unsigned int *maskp)
+{
+        unsigned flags = 0;
+        int op = '=';
+
+        switch (*str) {
+        case '+':
+        case '-':
+        case '=':
+                op = *str++;
+                break;
+        default:
+                return -EINVAL;
+        }
+        if (verbose)
+                printk(KERN_INFO "%s: op='%c'\n", __func__, op);
+
+        for ( ; *str ; ++str) {
+                switch (*str) {
+                case 'p':
+                        flags |= _DPRINTK_FLAGS_PRINT;
+                        break;
+                default:
+                        return -EINVAL;
+                }
+        }
+        if (flags == 0)
+                return -EINVAL;
+        if (verbose)
+                printk(KERN_INFO "%s: flags=0x%x\n", __func__, flags);
+
+        /* calculate final *flagsp, *maskp according to mask and op */
+        switch (op) {
+        case '=':
+                *maskp = 0;
+                *flagsp = flags;
+                break;
+        case '+':
+                *maskp = ~0U;
+                *flagsp = flags;
+                break;
+        case '-':
+                *maskp = ~flags;
+                *flagsp = 0;
+                break;
+        }
+        if (verbose)
+                printk(KERN_INFO "%s: *flagsp=0x%x *maskp=0x%x\n",
+                        __func__, *flagsp, *maskp);
+        return 0;
+}
+
+/*
+ * File_ops->write method for <debugfs>/dynamic_debug/conrol.  Gathers the
+ * command text from userspace, parses and executes it.
+ */
+static ssize_t ddebug_proc_write(struct file *file, const char __user *ubuf,
+                                  size_t len, loff_t *offp)
+{
+        unsigned int flags = 0, mask = 0;
+        struct ddebug_query query;
+#define MAXWORDS 9
+        int nwords;
+        char *words[MAXWORDS];
+        char tmpbuf[256];
+
+        if (len == 0)
+                return 0;
+        /* we don't check *offp -- multiple writes() are allowed */
+        if (len > sizeof(tmpbuf)-1)
+                return -E2BIG;
+        if (copy_from_user(tmpbuf, ubuf, len))
+                return -EFAULT;
+        tmpbuf[len] = '\0';
+        if (verbose)
+                printk(KERN_INFO "%s: read %d bytes from userspace\n",
+                        __func__, (int)len);
+
+        nwords = ddebug_tokenize(tmpbuf, words, MAXWORDS);
+        if (nwords < 0)
+                return -EINVAL;
+        if (ddebug_parse_query(words, nwords-1, &query))
+                return -EINVAL;
+        if (ddebug_parse_flags(words[nwords-1], &flags, &mask))
+                return -EINVAL;
+
+        /* actually go and implement the change */
+        ddebug_change(&query, flags, mask);
+
+        *offp += len;
+        return len;
+}
+
+/*
+ * Set the iterator to point to the first _ddebug object
+ * and return a pointer to that first object.  Returns
+ * NULL if there are no _ddebugs at all.
+ */
+static struct _ddebug *ddebug_iter_first(struct ddebug_iter *iter)
+{
+        if (list_empty(&ddebug_tables)) {
+                iter->table = NULL;
+                iter->idx = 0;
+                return NULL;
+        }
+        iter->table = list_entry(ddebug_tables.next,
+                                 struct ddebug_table, link);
+        iter->idx = 0;
+        return &iter->table->ddebugs[iter->idx];
+}
+
+/*
+ * Advance the iterator to point to the next _ddebug
+ * object from the one the iterator currently points at,
+ * and returns a pointer to the new _ddebug.  Returns
+ * NULL if the iterator has seen all the _ddebugs.
+ */
+static struct _ddebug *ddebug_iter_next(struct ddebug_iter *iter)
+{
+        if (iter->table == NULL)
+                return NULL;
+        if (++iter->idx == iter->table->num_ddebugs) {
+                /* iterate to next table */
+                iter->idx = 0;
+                if (list_is_last(&iter->table->link, &ddebug_tables)) {
+                        iter->table = NULL;
+                        return NULL;
+                }
+                iter->table = list_entry(iter->table->link.next,
+                                         struct ddebug_table, link);
+        }
+        return &iter->table->ddebugs[iter->idx];
+}
+
+/*
+ * Seq_ops start method.  Called at the start of every
+ * read() call from userspace.  Takes the ddebug_lock and
+ * seeks the seq_file's iterator to the given position.
+ */
+static void *ddebug_proc_start(struct seq_file *m, loff_t *pos)
+{
+        struct ddebug_iter *iter = m->private;
+        struct _ddebug *dp;
+        int n = *pos;
+
+        if (verbose)
+                printk(KERN_INFO "%s: called m=%p *pos=%lld\n",
+                        __func__, m, (unsigned long long)*pos);
+
+        mutex_lock(&ddebug_lock);
+
+        if (!n)
+                return SEQ_START_TOKEN;
+        if (n < 0)
+                return NULL;
+        dp = ddebug_iter_first(iter);
+        while (dp != NULL && --n > 0)
+                dp = ddebug_iter_next(iter);
+        return dp;
+}
+
+/*
+ * Seq_ops next method.  Called several times within a read()
+ * call from userspace, with ddebug_lock held.  Walks to the
+ * next _ddebug object with a special case for the header line.
+ */
+static void *ddebug_proc_next(struct seq_file *m, void *p, loff_t *pos)
+{
+        struct ddebug_iter *iter = m->private;
+        struct _ddebug *dp;
+
+        if (verbose)
+                printk(KERN_INFO "%s: called m=%p p=%p *pos=%lld\n",
+                        __func__, m, p, (unsigned long long)*pos);
+
+        if (p == SEQ_START_TOKEN)
+                dp = ddebug_iter_first(iter);
+        else
+                dp = ddebug_iter_next(iter);
+        ++*pos;
+        return dp;
+}
+
+/*
+ * Seq_ops show method.  Called several times within a read()
+ * call from userspace, with ddebug_lock held.  Formats the
+ * current _ddebug as a single human-readable line, with a
+ * special case for the header line.
+ */
+static int ddebug_proc_show(struct seq_file *m, void *p)
+{
+        struct ddebug_iter *iter = m->private;
+        struct _ddebug *dp = p;
+        char flagsbuf[8];
+
+        if (verbose)
+                printk(KERN_INFO "%s: called m=%p p=%p\n",
+                        __func__, m, p);
+
+        if (p == SEQ_START_TOKEN) {
+                seq_puts(m,
+                        "# filename:lineno [module]function flags format\n");
+                return 0;
+        }
+
+        seq_printf(m, "%s:%u [%s]%s %s \"",
+                   dp->filename, dp->lineno,
+                   iter->table->mod_name, dp->function,
+                   ddebug_describe_flags(dp, flagsbuf, sizeof(flagsbuf)));
+        seq_escape(m, dp->format, "\t\r\n\"");
+        seq_puts(m, "\"\n");
+
+        return 0;
+}
+
+/*
+ * Seq_ops stop method.  Called at the end of each read()
+ * call from userspace.  Drops ddebug_lock.
+ */
+static void ddebug_proc_stop(struct seq_file *m, void *p)
+{
+        if (verbose)
+                printk(KERN_INFO "%s: called m=%p p=%p\n",
+                        __func__, m, p);
+        mutex_unlock(&ddebug_lock);
+}
+
+static const struct seq_operations ddebug_proc_seqops = {
+        .start = ddebug_proc_start,
+        .next = ddebug_proc_next,
+        .show = ddebug_proc_show,
+        .stop = ddebug_proc_stop
+};
+
+/*
+ * File_ops->open method for <debugfs>/dynamic_debug/control.  Does the seq_file
+ * setup dance, and also creates an iterator to walk the _ddebugs.
+ * Note that we create a seq_file always, even for O_WRONLY files
+ * where it's not needed, as doing so simplifies the ->release method.
+ */
+static int ddebug_proc_open(struct inode *inode, struct file *file)
+{
+        struct ddebug_iter *iter;
+        int err;
+
+        if (verbose)
+                printk(KERN_INFO "%s: called\n", __func__);
+
+        iter = kzalloc(sizeof(*iter), GFP_KERNEL);
+        if (iter == NULL)
+                return -ENOMEM;
+
+        err = seq_open(file, &ddebug_proc_seqops);
+        if (err) {
+                kfree(iter);
+                return err;
+        }
+        ((struct seq_file *) file->private_data)->private = iter;
+        return 0;
+}
+
+static const struct file_operations ddebug_proc_fops = {
+        .owner = THIS_MODULE,
+        .open = ddebug_proc_open,
+        .read = seq_read,
+        .llseek = seq_lseek,
+        .release = seq_release_private,
+        .write = ddebug_proc_write
+};
+
+/*
+ * Allocate a new ddebug_table for the given module
+ * and add it to the global list.
+ */
+int ddebug_add_module(struct _ddebug *tab, unsigned int n,
+                             const char *name)
+{
+        struct ddebug_table *dt;
+        char *new_name;
+
+        dt = kzalloc(sizeof(*dt), GFP_KERNEL);
+        if (dt == NULL)
+                return -ENOMEM;
+        new_name = kstrdup(name, GFP_KERNEL);
+        if (new_name == NULL) {
+                kfree(dt);
+                return -ENOMEM;
+        }
+        dt->mod_name = new_name;
+        dt->num_ddebugs = n;
+        dt->num_enabled = 0;
+        dt->ddebugs = tab;
+
+        mutex_lock(&ddebug_lock);
+        list_add_tail(&dt->link, &ddebug_tables);
+        mutex_unlock(&ddebug_lock);
+
+        if (verbose)
+                printk(KERN_INFO "%u debug prints in module %s\n",
+                                 n, dt->mod_name);
+        return 0;
+}
+EXPORT_SYMBOL_GPL(ddebug_add_module);
+
+static void ddebug_table_free(struct ddebug_table *dt)
+{
+        list_del_init(&dt->link);
+        kfree(dt->mod_name);
+        kfree(dt);
+}
+
+/*
+ * Called in response to a module being unloaded.  Removes
+ * any ddebug_table's which point at the module.
+ */
+int ddebug_remove_module(char *mod_name)
+{
+        struct ddebug_table *dt, *nextdt;
+        int ret = -ENOENT;
+
+        if (verbose)
+                printk(KERN_INFO "%s: removing module \"%s\"\n",
+                                __func__, mod_name);
+
+        mutex_lock(&ddebug_lock);
+        list_for_each_entry_safe(dt, nextdt, &ddebug_tables, link) {
+                if (!strcmp(dt->mod_name, mod_name)) {
+                        ddebug_table_free(dt);
+                        ret = 0;
+                }
+        }
+        mutex_unlock(&ddebug_lock);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(ddebug_remove_module);
+
+static void ddebug_remove_all_tables(void)
+{
+        mutex_lock(&ddebug_lock);
+        while (!list_empty(&ddebug_tables)) {
+                struct ddebug_table *dt = list_entry(ddebug_tables.next,
+                                                      struct ddebug_table,
+                                                      link);
+                ddebug_table_free(dt);
+        }
+        mutex_unlock(&ddebug_lock);
+}
+
+static int __init dynamic_debug_init(void)
+{
+        struct dentry *dir, *file;
+        struct _ddebug *iter, *iter_start;
+        const char *modname = NULL;
+        int ret = 0;
+        int n = 0;
+
+        dir = debugfs_create_dir("dynamic_debug", NULL);
+        if (!dir)
+                return -ENOMEM;
+        file = debugfs_create_file("control", 0644, dir, NULL,
+                                        &ddebug_proc_fops);
+        if (!file) {
+                debugfs_remove(dir);
+                return -ENOMEM;
+        }
+        if (__start___verbose != __stop___verbose) {
+                iter = __start___verbose;
+                modname = iter->modname;
+                iter_start = iter;
+                for (; iter < __stop___verbose; iter++) {
+                        if (strcmp(modname, iter->modname)) {
+                                ret = ddebug_add_module(iter_start, n, modname);
+                                if (ret)
+                                        goto out_free;
+                                n = 0;
+                                modname = iter->modname;
+                                iter_start = iter;
+                        }
+                        n++;
+                }
+                ret = ddebug_add_module(iter_start, n, modname);
+        }
+out_free:
+        if (ret) {
+                ddebug_remove_all_tables();
+                debugfs_remove(dir);
+                debugfs_remove(file);
+        }
+        return 0;
+}
+module_init(dynamic_debug_init);
diff --git a/lib/dynamic_printk.c b/lib/dynamic_printk.c
deleted file mode 100644
index 165a19763dc9..000000000000
--- a/lib/dynamic_printk.c
+++ /dev/null
@@ -1,414 +0,0 @@
-/*
- * lib/dynamic_printk.c
- *
- * make pr_debug()/dev_dbg() calls runtime configurable based upon their
- * their source module.
- *
- * Copyright (C) 2008 Red Hat, Inc., Jason Baron <jbaron@redhat.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/uaccess.h>
-#include <linux/seq_file.h>
-#include <linux/debugfs.h>
-#include <linux/fs.h>
-
-extern struct mod_debug __start___verbose[];
-extern struct mod_debug __stop___verbose[];
-
-struct debug_name {
-        struct hlist_node hlist;
-        struct hlist_node hlist2;
-        int hash1;
-        int hash2;
-        char *name;
-        int enable;
-        int type;
-};
-
-static int nr_entries;
-static int num_enabled;
-int dynamic_enabled = DYNAMIC_ENABLED_NONE;
-static struct hlist_head module_table[DEBUG_HASH_TABLE_SIZE] =
-        { [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
-static struct hlist_head module_table2[DEBUG_HASH_TABLE_SIZE] =
-        { [0 ... DEBUG_HASH_TABLE_SIZE-1] = HLIST_HEAD_INIT };
-static DECLARE_MUTEX(debug_list_mutex);
-
-/* dynamic_printk_enabled, and dynamic_printk_enabled2 are bitmasks in which
- * bit n is set to 1 if any modname hashes into the bucket n, 0 otherwise. They
- * use independent hash functions, to reduce the chance of false positives.
- */
-long long dynamic_printk_enabled;
-EXPORT_SYMBOL_GPL(dynamic_printk_enabled);
-long long dynamic_printk_enabled2;
-EXPORT_SYMBOL_GPL(dynamic_printk_enabled2);
-
-/* returns the debug module pointer. */
-static struct debug_name *find_debug_module(char *module_name)
-{
-        int i;
-        struct hlist_head *head;
-        struct hlist_node *node;
-        struct debug_name *element;
-
-        element = NULL;
-        for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
-                head = &module_table[i];
-                hlist_for_each_entry_rcu(element, node, head, hlist)
-                        if (!strcmp(element->name, module_name))
-                                return element;
-        }
-        return NULL;
-}
-
-/* returns the debug module pointer. */
-static struct debug_name *find_debug_module_hash(char *module_name, int hash)
-{
-        struct hlist_head *head;
-        struct hlist_node *node;
-        struct debug_name *element;
-
-        element = NULL;
-        head = &module_table[hash];
-        hlist_for_each_entry_rcu(element, node, head, hlist)
-                if (!strcmp(element->name, module_name))
-                        return element;
-        return NULL;
-}
-
-/* caller must hold mutex*/
-static int __add_debug_module(char *mod_name, int hash, int hash2)
-{
-        struct debug_name *new;
-        char *module_name;
-        int ret = 0;
-
-        if (find_debug_module(mod_name)) {
-                ret = -EINVAL;
-                goto out;
-        }
-        module_name = kmalloc(strlen(mod_name) + 1, GFP_KERNEL);
-        if (!module_name) {
-                ret = -ENOMEM;
-                goto out;
-        }
-        module_name = strcpy(module_name, mod_name);
-        module_name[strlen(mod_name)] = '\0';
-        new = kzalloc(sizeof(struct debug_name), GFP_KERNEL);
-        if (!new) {
-                kfree(module_name);
-                ret = -ENOMEM;
-                goto out;
-        }
-        INIT_HLIST_NODE(&new->hlist);
-        INIT_HLIST_NODE(&new->hlist2);
-        new->name = module_name;
-        new->hash1 = hash;
-        new->hash2 = hash2;
-        hlist_add_head_rcu(&new->hlist, &module_table[hash]);
-        hlist_add_head_rcu(&new->hlist2, &module_table2[hash2]);
-        nr_entries++;
-out:
-        return ret;
-}
-
-int unregister_dynamic_debug_module(char *mod_name)
-{
-        struct debug_name *element;
-        int ret = 0;
-
-        down(&debug_list_mutex);
-        element = find_debug_module(mod_name);
-        if (!element) {
-                ret = -EINVAL;
-                goto out;
-        }
-        hlist_del_rcu(&element->hlist);
-        hlist_del_rcu(&element->hlist2);
-        synchronize_rcu();
-        kfree(element->name);
-        if (element->enable)
-                num_enabled--;
-        kfree(element);
-        nr_entries--;
-out:
-        up(&debug_list_mutex);
-        return ret;
-}
-EXPORT_SYMBOL_GPL(unregister_dynamic_debug_module);
-
-int register_dynamic_debug_module(char *mod_name, int type, char *share_name,
-                                        char *flags, int hash, int hash2)
-{
-        struct debug_name *elem;
-        int ret = 0;
-
-        down(&debug_list_mutex);
-        elem = find_debug_module(mod_name);
-        if (!elem) {
-                if (__add_debug_module(mod_name, hash, hash2))
-                        goto out;
-                elem = find_debug_module(mod_name);
-                if (dynamic_enabled == DYNAMIC_ENABLED_ALL &&
-                                !strcmp(mod_name, share_name)) {
-                        elem->enable = true;
-                        num_enabled++;
-                }
-        }
-        elem->type |= type;
-out:
-        up(&debug_list_mutex);
-        return ret;
-}
-EXPORT_SYMBOL_GPL(register_dynamic_debug_module);
-
-int __dynamic_dbg_enabled_helper(char *mod_name, int type, int value, int hash)
-{
-        struct debug_name *elem;
-        int ret = 0;
-
-        if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
-                return 1;
-        rcu_read_lock();
-        elem = find_debug_module_hash(mod_name, hash);
-        if (elem && elem->enable)
-                ret = 1;
-        rcu_read_unlock();
-        return ret;
-}
-EXPORT_SYMBOL_GPL(__dynamic_dbg_enabled_helper);
-
-static void set_all(bool enable)
-{
-        struct debug_name *e;
-        struct hlist_node *node;
-        int i;
-        long long enable_mask;
-
-        for (i = 0; i < DEBUG_HASH_TABLE_SIZE; i++) {
-                if (module_table[i].first != NULL) {
-                        hlist_for_each_entry(e, node, &module_table[i], hlist) {
-                                e->enable = enable;
-                        }
-                }
-        }
-        if (enable)
-                enable_mask = ULLONG_MAX;
-        else
-                enable_mask = 0;
-        dynamic_printk_enabled = enable_mask;
-        dynamic_printk_enabled2 = enable_mask;
-}
-
-static int disabled_hash(int i, bool first_table)
-{
-        struct debug_name *e;
-        struct hlist_node *node;
-
-        if (first_table) {
-                hlist_for_each_entry(e, node, &module_table[i], hlist) {
-                        if (e->enable)
-                                return 0;
-                }
-        } else {
-                hlist_for_each_entry(e, node, &module_table2[i], hlist2) {
-                        if (e->enable)
-                                return 0;
-                }
-        }
-        return 1;
-}
-
-static ssize_t pr_debug_write(struct file *file, const char __user *buf,
-                                size_t length, loff_t *ppos)
-{
-        char *buffer, *s, *value_str, *setting_str;
-        int err, value;
-        struct debug_name *elem = NULL;
-        int all = 0;
-
-        if (length > PAGE_SIZE || length < 0)
-                return -EINVAL;
-
-        buffer = (char *)__get_free_page(GFP_KERNEL);
-        if (!buffer)
-                return -ENOMEM;
-
-        err = -EFAULT;
-        if (copy_from_user(buffer, buf, length))
-                goto out;
-
-        err = -EINVAL;
-        if (length < PAGE_SIZE)
-                buffer[length] = '\0';
-        else if (buffer[PAGE_SIZE-1])
-                goto out;
-
-        err = -EINVAL;
-        down(&debug_list_mutex);
-
-        if (strncmp("set", buffer, 3))
-                goto out_up;
-        s = buffer + 3;
-        setting_str = strsep(&s, "=");
-        if (s == NULL)
-                goto out_up;
-        setting_str = strstrip(setting_str);
-        value_str = strsep(&s, " ");
-        if (s == NULL)
-                goto out_up;
-        s = strstrip(s);
-        if (!strncmp(s, "all", 3))
-                all = 1;
-        else
-                elem = find_debug_module(s);
-        if (!strncmp(setting_str, "enable", 6)) {
-                value = !!simple_strtol(value_str, NULL, 10);
-                if (all) {
-                        if (value) {
-                                set_all(true);
-                                num_enabled = nr_entries;
-                                dynamic_enabled = DYNAMIC_ENABLED_ALL;
-                        } else {
-                                set_all(false);
-                                num_enabled = 0;
-                                dynamic_enabled = DYNAMIC_ENABLED_NONE;
-                        }
-                        err = 0;
-                } else if (elem) {
-                        if (value && (elem->enable == 0)) {
-                                dynamic_printk_enabled |= (1LL << elem->hash1);
-                                dynamic_printk_enabled2 |= (1LL << elem->hash2);
-                                elem->enable = 1;
-                                num_enabled++;
-                                dynamic_enabled = DYNAMIC_ENABLED_SOME;
-                                err = 0;
-                                printk(KERN_DEBUG
-                                        "debugging enabled for module %s\n",
-                                        elem->name);
-                        } else if (!value && (elem->enable == 1)) {
-                                elem->enable = 0;
-                                num_enabled--;
-                                if (disabled_hash(elem->hash1, true))
-                                        dynamic_printk_enabled &=
-                                                        ~(1LL << elem->hash1);
-                                if (disabled_hash(elem->hash2, false))
-                                        dynamic_printk_enabled2 &=
-                                                        ~(1LL << elem->hash2);
-                                if (num_enabled)
-                                        dynamic_enabled = DYNAMIC_ENABLED_SOME;
-                                else
-                                        dynamic_enabled = DYNAMIC_ENABLED_NONE;
-                                err = 0;
-                                printk(KERN_DEBUG
-                                        "debugging disabled for module %s\n",
-                                        elem->name);
-                        }
-                }
-        }
-        if (!err)
-                err = length;
-out_up:
-        up(&debug_list_mutex);
-out:
-        free_page((unsigned long)buffer);
-        return err;
-}
-
-static void *pr_debug_seq_start(struct seq_file *f, loff_t *pos)
-{
-        return (*pos < DEBUG_HASH_TABLE_SIZE) ? pos : NULL;
-}
-
-static void *pr_debug_seq_next(struct seq_file *s, void *v, loff_t *pos)
-{
-        (*pos)++;
-        if (*pos >= DEBUG_HASH_TABLE_SIZE)
-                return NULL;
-        return pos;
-}
-
-static void pr_debug_seq_stop(struct seq_file *s, void *v)
-{
-        /* Nothing to do */
-}
-
-static int pr_debug_seq_show(struct seq_file *s, void *v)
-{
-        struct hlist_head *head;
-        struct hlist_node *node;
-        struct debug_name *elem;
-        unsigned int i = *(loff_t *) v;
-
-        rcu_read_lock();
-        head = &module_table[i];
-        hlist_for_each_entry_rcu(elem, node, head, hlist) {
-                seq_printf(s, "%s enabled=%d", elem->name, elem->enable);
-                seq_printf(s, "\n");
-        }
-        rcu_read_unlock();
-        return 0;
-}
-
-static struct seq_operations pr_debug_seq_ops = {
-        .start = pr_debug_seq_start,
-        .next  = pr_debug_seq_next,
-        .stop  = pr_debug_seq_stop,
-        .show  = pr_debug_seq_show
-};
-
-static int pr_debug_open(struct inode *inode, struct file *filp)
-{
-        return seq_open(filp, &pr_debug_seq_ops);
-}
-
-static const struct file_operations pr_debug_operations = {
-        .open           = pr_debug_open,
-        .read           = seq_read,
-        .write          = pr_debug_write,
-        .llseek         = seq_lseek,
-        .release        = seq_release,
-};
-
-static int __init dynamic_printk_init(void)
-{
-        struct dentry *dir, *file;
-        struct mod_debug *iter;
-        unsigned long value;
-
-        dir = debugfs_create_dir("dynamic_printk", NULL);
-        if (!dir)
-                return -ENOMEM;
-        file = debugfs_create_file("modules", 0644, dir, NULL,
-                                        &pr_debug_operations);
-        if (!file) {
-                debugfs_remove(dir);
-                return -ENOMEM;
-        }
-        for (value = (unsigned long)__start___verbose;
-                value < (unsigned long)__stop___verbose;
-                value += sizeof(struct mod_debug)) {
-                        iter = (struct mod_debug *)value;
-                        register_dynamic_debug_module(iter->modname,
-                                iter->type,
-                                iter->logical_modname,
-                                iter->flag_names, iter->hash, iter->hash2);
-        }
-        if (dynamic_enabled == DYNAMIC_ENABLED_ALL)
-                set_all(true);
-        return 0;
-}
-module_init(dynamic_printk_init);
-/* may want to move this earlier so we can get traces as early as possible */
-
-static int __init dynamic_printk_setup(char *str)
-{
-        if (str)
-                return -ENOENT;
-        dynamic_enabled = DYNAMIC_ENABLED_ALL;
-        return 0;
-}
-/* Use early_param(), so we can get debug output as early as possible */
-early_param("dynamic_printk", dynamic_printk_setup);
diff --git a/lib/kernel_lock.c b/lib/kernel_lock.c
index 01a3c22c1b5a..39f1029e3525 100644
--- a/lib/kernel_lock.c
+++ b/lib/kernel_lock.c
@@ -39,7 +39,7 @@ static  __cacheline_aligned_in_smp DEFINE_SPINLOCK(kernel_flag);
 int __lockfunc __reacquire_kernel_lock(void)
 {
         while (!_raw_spin_trylock(&kernel_flag)) {
-                if (test_thread_flag(TIF_NEED_RESCHED))
+                if (need_resched())
                         return -EAGAIN;
                 cpu_relax();
         }
diff --git a/lib/kobject.c b/lib/kobject.c
index 0487d1f64806..a6dec32f2ddd 100644
--- a/lib/kobject.c
+++ b/lib/kobject.c
@@ -212,7 +212,7 @@ static int kobject_add_internal(struct kobject *kobj)
  * @fmt: format string used to build the name
  * @vargs: vargs to format the string.
  */
-static int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
+int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
                                   va_list vargs)
 {
         const char *old_name = kobj->name;
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index 318328ddbd1c..97a777ad4f59 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -118,6 +118,13 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
         kset = top_kobj->kset;
         uevent_ops = kset->uevent_ops;
 
+        /* skip the event, if uevent_suppress is set*/
+        if (kobj->uevent_suppress) {
+                pr_debug("kobject: '%s' (%p): %s: uevent_suppress "
+                                 "caused the event to drop!\n",
+                                 kobject_name(kobj), kobj, __func__);
+                return 0;
+        }
         /* skip the event, if the filter returns zero. */
         if (uevent_ops && uevent_ops->filter)
                 if (!uevent_ops->filter(kset, kobj)) {
@@ -227,6 +234,9 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
                         NETLINK_CB(skb).dst_group = 1;
                         retval = netlink_broadcast(uevent_sock, skb, 0, 1,
                                                    GFP_KERNEL);
+                        /* ENOBUFS should be handled in userspace */
+                        if (retval == -ENOBUFS)
+                                retval = 0;
                 } else
                         retval = -ENOMEM;
         }
@@ -248,7 +258,7 @@ int kobject_uevent_env(struct kobject *kobj, enum kobject_action action,
                         goto exit;
 
                 retval = call_usermodehelper(argv[0], argv,
-                                             env->envp, UMH_WAIT_EXEC);
+                                             env->envp, UMH_NO_WAIT);
         }
 
 exit:
diff --git a/lib/nlattr.c b/lib/nlattr.c
new file mode 100644
index 000000000000..c4706eb98d3d
--- /dev/null
+++ b/lib/nlattr.c
@@ -0,0 +1,502 @@
+/*
+ * NETLINK      Netlink attributes
+ *
+ *              Authors:        Thomas Graf <tgraf@suug.ch>
+ *                              Alexey Kuznetsov <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/jiffies.h>
+#include <linux/netdevice.h>
+#include <linux/skbuff.h>
+#include <linux/string.h>
+#include <linux/types.h>
+#include <net/netlink.h>
+
+static u16 nla_attr_minlen[NLA_TYPE_MAX+1] __read_mostly = {
+        [NLA_U8]        = sizeof(u8),
+        [NLA_U16]       = sizeof(u16),
+        [NLA_U32]       = sizeof(u32),
+        [NLA_U64]       = sizeof(u64),
+        [NLA_NESTED]    = NLA_HDRLEN,
+};
+
+static int validate_nla(struct nlattr *nla, int maxtype,
+                        const struct nla_policy *policy)
+{
+        const struct nla_policy *pt;
+        int minlen = 0, attrlen = nla_len(nla), type = nla_type(nla);
+
+        if (type <= 0 || type > maxtype)
+                return 0;
+
+        pt = &policy[type];
+
+        BUG_ON(pt->type > NLA_TYPE_MAX);
+
+        switch (pt->type) {
+        case NLA_FLAG:
+                if (attrlen > 0)
+                        return -ERANGE;
+                break;
+
+        case NLA_NUL_STRING:
+                if (pt->len)
+                        minlen = min_t(int, attrlen, pt->len + 1);
+                else
+                        minlen = attrlen;
+
+                if (!minlen || memchr(nla_data(nla), '\0', minlen) == NULL)
+                        return -EINVAL;
+                /* fall through */
+
+        case NLA_STRING:
+                if (attrlen < 1)
+                        return -ERANGE;
+
+                if (pt->len) {
+                        char *buf = nla_data(nla);
+
+                        if (buf[attrlen - 1] == '\0')
+                                attrlen--;
+
+                        if (attrlen > pt->len)
+                                return -ERANGE;
+                }
+                break;
+
+        case NLA_BINARY:
+                if (pt->len && attrlen > pt->len)
+                        return -ERANGE;
+                break;
+
+        case NLA_NESTED_COMPAT:
+                if (attrlen < pt->len)
+                        return -ERANGE;
+                if (attrlen < NLA_ALIGN(pt->len))
+                        break;
+                if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN)
+                        return -ERANGE;
+                nla = nla_data(nla) + NLA_ALIGN(pt->len);
+                if (attrlen < NLA_ALIGN(pt->len) + NLA_HDRLEN + nla_len(nla))
+                        return -ERANGE;
+                break;
+        case NLA_NESTED:
+                /* a nested attributes is allowed to be empty; if its not,
+                 * it must have a size of at least NLA_HDRLEN.
+                 */
+                if (attrlen == 0)
+                        break;
+        default:
+                if (pt->len)
+                        minlen = pt->len;
+                else if (pt->type != NLA_UNSPEC)
+                        minlen = nla_attr_minlen[pt->type];
+
+                if (attrlen < minlen)
+                        return -ERANGE;
+        }
+
+        return 0;
+}
+
+/**
+ * nla_validate - Validate a stream of attributes
+ * @head: head of attribute stream
+ * @len: length of attribute stream
+ * @maxtype: maximum attribute type to be expected
+ * @policy: validation policy
+ *
+ * Validates all attributes in the specified attribute stream against the
+ * specified policy. Attributes with a type exceeding maxtype will be
+ * ignored. See documenation of struct nla_policy for more details.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int nla_validate(struct nlattr *head, int len, int maxtype,
+                 const struct nla_policy *policy)
+{
+        struct nlattr *nla;
+        int rem, err;
+
+        nla_for_each_attr(nla, head, len, rem) {
+                err = validate_nla(nla, maxtype, policy);
+                if (err < 0)
+                        goto errout;
+        }
+
+        err = 0;
+errout:
+        return err;
+}
+
+/**
+ * nla_policy_len - Determin the max. length of a policy
+ * @policy: policy to use
+ * @n: number of policies
+ *
+ * Determines the max. length of the policy.  It is currently used
+ * to allocated Netlink buffers roughly the size of the actual
+ * message.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int
+nla_policy_len(const struct nla_policy *p, int n)
+{
+        int i, len = 0;
+
+        for (i = 0; i < n; i++) {
+                if (p->len)
+                        len += nla_total_size(p->len);
+                else if (nla_attr_minlen[p->type])
+                        len += nla_total_size(nla_attr_minlen[p->type]);
+        }
+
+        return len;
+}
+
+/**
+ * nla_parse - Parse a stream of attributes into a tb buffer
+ * @tb: destination array with maxtype+1 elements
+ * @maxtype: maximum attribute type to be expected
+ * @head: head of attribute stream
+ * @len: length of attribute stream
+ * @policy: validation policy
+ *
+ * Parses a stream of attributes and stores a pointer to each attribute in
+ * the tb array accessable via the attribute type. Attributes with a type
+ * exceeding maxtype will be silently ignored for backwards compatibility
+ * reasons. policy may be set to NULL if no validation is required.
+ *
+ * Returns 0 on success or a negative error code.
+ */
+int nla_parse(struct nlattr *tb[], int maxtype, struct nlattr *head, int len,
+              const struct nla_policy *policy)
+{
+        struct nlattr *nla;
+        int rem, err;
+
+        memset(tb, 0, sizeof(struct nlattr *) * (maxtype + 1));
+
+        nla_for_each_attr(nla, head, len, rem) {
+                u16 type = nla_type(nla);
+
+                if (type > 0 && type <= maxtype) {
+                        if (policy) {
+                                err = validate_nla(nla, maxtype, policy);
+                                if (err < 0)
+                                        goto errout;
+                        }
+
+                        tb[type] = nla;
+                }
+        }
+
+        if (unlikely(rem > 0))
+                printk(KERN_WARNING "netlink: %d bytes leftover after parsing "
+                       "attributes.\n", rem);
+
+        err = 0;
+errout:
+        return err;
+}
+
+/**
+ * nla_find - Find a specific attribute in a stream of attributes
+ * @head: head of attribute stream
+ * @len: length of attribute stream
+ * @attrtype: type of attribute to look for
+ *
+ * Returns the first attribute in the stream matching the specified type.
+ */
+struct nlattr *nla_find(struct nlattr *head, int len, int attrtype)
+{
+        struct nlattr *nla;
+        int rem;
+
+        nla_for_each_attr(nla, head, len, rem)
+                if (nla_type(nla) == attrtype)
+                        return nla;
+
+        return NULL;
+}
+
+/**
+ * nla_strlcpy - Copy string attribute payload into a sized buffer
+ * @dst: where to copy the string to
+ * @nla: attribute to copy the string from
+ * @dstsize: size of destination buffer
+ *
+ * Copies at most dstsize - 1 bytes into the destination buffer.
+ * The result is always a valid NUL-terminated string. Unlike
+ * strlcpy the destination buffer is always padded out.
+ *
+ * Returns the length of the source buffer.
+ */
+size_t nla_strlcpy(char *dst, const struct nlattr *nla, size_t dstsize)
+{
+        size_t srclen = nla_len(nla);
+        char *src = nla_data(nla);
+
+        if (srclen > 0 && src[srclen - 1] == '\0')
+                srclen--;
+
+        if (dstsize > 0) {
+                size_t len = (srclen >= dstsize) ? dstsize - 1 : srclen;
+
+                memset(dst, 0, dstsize);
+                memcpy(dst, src, len);
+        }
+
+        return srclen;
+}
+
+/**
+ * nla_memcpy - Copy a netlink attribute into another memory area
+ * @dest: where to copy to memcpy
+ * @src: netlink attribute to copy from
+ * @count: size of the destination area
+ *
+ * Note: The number of bytes copied is limited by the length of
+ *       attribute's payload. memcpy
+ *
+ * Returns the number of bytes copied.
+ */
+int nla_memcpy(void *dest, const struct nlattr *src, int count)
+{
+        int minlen = min_t(int, count, nla_len(src));
+
+        memcpy(dest, nla_data(src), minlen);
+
+        return minlen;
+}
+
+/**
+ * nla_memcmp - Compare an attribute with sized memory area
+ * @nla: netlink attribute
+ * @data: memory area
+ * @size: size of memory area
+ */
+int nla_memcmp(const struct nlattr *nla, const void *data,
+                             size_t size)
+{
+        int d = nla_len(nla) - size;
+
+        if (d == 0)
+                d = memcmp(nla_data(nla), data, size);
+
+        return d;
+}
+
+/**
+ * nla_strcmp - Compare a string attribute against a string
+ * @nla: netlink string attribute
+ * @str: another string
+ */
+int nla_strcmp(const struct nlattr *nla, const char *str)
+{
+        int len = strlen(str) + 1;
+        int d = nla_len(nla) - len;
+
+        if (d == 0)
+                d = memcmp(nla_data(nla), str, len);
+
+        return d;
+}
+
+#ifdef CONFIG_NET
+/**
+ * __nla_reserve - reserve room for attribute on the skb
+ * @skb: socket buffer to reserve room on
+ * @attrtype: attribute type
+ * @attrlen: length of attribute payload
+ *
+ * Adds a netlink attribute header to a socket buffer and reserves
+ * room for the payload but does not copy it.
+ *
+ * The caller is responsible to ensure that the skb provides enough
+ * tailroom for the attribute header and payload.
+ */
+struct nlattr *__nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
+{
+        struct nlattr *nla;
+
+        nla = (struct nlattr *) skb_put(skb, nla_total_size(attrlen));
+        nla->nla_type = attrtype;
+        nla->nla_len = nla_attr_size(attrlen);
+
+        memset((unsigned char *) nla + nla->nla_len, 0, nla_padlen(attrlen));
+
+        return nla;
+}
+EXPORT_SYMBOL(__nla_reserve);
+
+/**
+ * __nla_reserve_nohdr - reserve room for attribute without header
+ * @skb: socket buffer to reserve room on
+ * @attrlen: length of attribute payload
+ *
+ * Reserves room for attribute payload without a header.
+ *
+ * The caller is responsible to ensure that the skb provides enough
+ * tailroom for the payload.
+ */
+void *__nla_reserve_nohdr(struct sk_buff *skb, int attrlen)
+{
+        void *start;
+
+        start = skb_put(skb, NLA_ALIGN(attrlen));
+        memset(start, 0, NLA_ALIGN(attrlen));
+
+        return start;
+}
+EXPORT_SYMBOL(__nla_reserve_nohdr);
+
+/**
+ * nla_reserve - reserve room for attribute on the skb
+ * @skb: socket buffer to reserve room on
+ * @attrtype: attribute type
+ * @attrlen: length of attribute payload
+ *
+ * Adds a netlink attribute header to a socket buffer and reserves
+ * room for the payload but does not copy it.
+ *
+ * Returns NULL if the tailroom of the skb is insufficient to store
+ * the attribute header and payload.
+ */
+struct nlattr *nla_reserve(struct sk_buff *skb, int attrtype, int attrlen)
+{
+        if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen)))
+                return NULL;
+
+        return __nla_reserve(skb, attrtype, attrlen);
+}
+EXPORT_SYMBOL(nla_reserve);
+
+/**
+ * nla_reserve_nohdr - reserve room for attribute without header
+ * @skb: socket buffer to reserve room on
+ * @attrlen: length of attribute payload
+ *
+ * Reserves room for attribute payload without a header.
+ *
+ * Returns NULL if the tailroom of the skb is insufficient to store
+ * the attribute payload.
+ */
+void *nla_reserve_nohdr(struct sk_buff *skb, int attrlen)
+{
+        if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
+                return NULL;
+
+        return __nla_reserve_nohdr(skb, attrlen);
+}
+EXPORT_SYMBOL(nla_reserve_nohdr);
+
+/**
+ * __nla_put - Add a netlink attribute to a socket buffer
+ * @skb: socket buffer to add attribute to
+ * @attrtype: attribute type
+ * @attrlen: length of attribute payload
+ * @data: head of attribute payload
+ *
+ * The caller is responsible to ensure that the skb provides enough
+ * tailroom for the attribute header and payload.
+ */
+void __nla_put(struct sk_buff *skb, int attrtype, int attrlen,
+                             const void *data)
+{
+        struct nlattr *nla;
+
+        nla = __nla_reserve(skb, attrtype, attrlen);
+        memcpy(nla_data(nla), data, attrlen);
+}
+EXPORT_SYMBOL(__nla_put);
+
+/**
+ * __nla_put_nohdr - Add a netlink attribute without header
+ * @skb: socket buffer to add attribute to
+ * @attrlen: length of attribute payload
+ * @data: head of attribute payload
+ *
+ * The caller is responsible to ensure that the skb provides enough
+ * tailroom for the attribute payload.
+ */
+void __nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
+{
+        void *start;
+
+        start = __nla_reserve_nohdr(skb, attrlen);
+        memcpy(start, data, attrlen);
+}
+EXPORT_SYMBOL(__nla_put_nohdr);
+
+/**
+ * nla_put - Add a netlink attribute to a socket buffer
+ * @skb: socket buffer to add attribute to
+ * @attrtype: attribute type
+ * @attrlen: length of attribute payload
+ * @data: head of attribute payload
+ *
+ * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
+ * the attribute header and payload.
+ */
+int nla_put(struct sk_buff *skb, int attrtype, int attrlen, const void *data)
+{
+        if (unlikely(skb_tailroom(skb) < nla_total_size(attrlen)))
+                return -EMSGSIZE;
+
+        __nla_put(skb, attrtype, attrlen, data);
+        return 0;
+}
+EXPORT_SYMBOL(nla_put);
+
+/**
+ * nla_put_nohdr - Add a netlink attribute without header
+ * @skb: socket buffer to add attribute to
+ * @attrlen: length of attribute payload
+ * @data: head of attribute payload
+ *
+ * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
+ * the attribute payload.
+ */
+int nla_put_nohdr(struct sk_buff *skb, int attrlen, const void *data)
+{
+        if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
+                return -EMSGSIZE;
+
+        __nla_put_nohdr(skb, attrlen, data);
+        return 0;
+}
+EXPORT_SYMBOL(nla_put_nohdr);
+
+/**
+ * nla_append - Add a netlink attribute without header or padding
+ * @skb: socket buffer to add attribute to
+ * @attrlen: length of attribute payload
+ * @data: head of attribute payload
+ *
+ * Returns -EMSGSIZE if the tailroom of the skb is insufficient to store
+ * the attribute payload.
+ */
+int nla_append(struct sk_buff *skb, int attrlen, const void *data)
+{
+        if (unlikely(skb_tailroom(skb) < NLA_ALIGN(attrlen)))
+                return -EMSGSIZE;
+
+        memcpy(skb_put(skb, attrlen), data, attrlen);
+        return 0;
+}
+EXPORT_SYMBOL(nla_append);
+#endif
+
+EXPORT_SYMBOL(nla_validate);
+EXPORT_SYMBOL(nla_policy_len);
+EXPORT_SYMBOL(nla_parse);
+EXPORT_SYMBOL(nla_find);
+EXPORT_SYMBOL(nla_strlcpy);
+EXPORT_SYMBOL(nla_memcpy);
+EXPORT_SYMBOL(nla_memcmp);
+EXPORT_SYMBOL(nla_strcmp);