7 files changed, 698 insertions, 2 deletions

diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index 7440a0dceddb..3d8e472a09c8 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -52,7 +52,10 @@
         . = ALIGN(8);                                                   \
         VMLINUX_SYMBOL(__start___markers) = .;                          \
         *(__markers)                                                    \
-        VMLINUX_SYMBOL(__stop___markers) = .;
+        VMLINUX_SYMBOL(__stop___markers) = .;                           \
+        VMLINUX_SYMBOL(__start___tracepoints) = .;                      \
+        *(__tracepoints)                                                \
+        VMLINUX_SYMBOL(__stop___tracepoints) = .;
 
 #define RO_DATA(align)                                                  \
         . = ALIGN((align));                                             \
@@ -61,6 +64,7 @@
                 *(.rodata) *(.rodata.*)                                 \
                 *(__vermagic)           /* Kernel version magic */      \
                 *(__markers_strings)    /* Markers: strings */          \
+                *(__tracepoints_strings)/* Tracepoints: strings */      \
         }                                                               \
                                                                         \
         .rodata1          : AT(ADDR(.rodata1) - LOAD_OFFSET) {          \
diff --git a/include/linux/module.h b/include/linux/module.h
index 68e09557c951..8b6113503863 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -16,6 +16,7 @@
 #include <linux/kobject.h>
 #include <linux/moduleparam.h>
 #include <linux/marker.h>
+#include <linux/tracepoint.h>
 #include <asm/local.h>
 
 #include <asm/module.h>
@@ -331,6 +332,10 @@ struct module
         struct marker *markers;
         unsigned int num_markers;
 #endif
+#ifdef CONFIG_TRACEPOINTS
+        struct tracepoint *tracepoints;
+        unsigned int num_tracepoints;
+#endif
 
 #ifdef CONFIG_MODULE_UNLOAD
         /* What modules depend on me? */
@@ -454,6 +459,9 @@ extern void print_modules(void);
 
 extern void module_update_markers(void);
 
+extern void module_update_tracepoints(void);
+extern int module_get_iter_tracepoints(struct tracepoint_iter *iter);
+
 #else /* !CONFIG_MODULES... */
 #define EXPORT_SYMBOL(sym)
 #define EXPORT_SYMBOL_GPL(sym)
@@ -558,6 +566,15 @@ static inline void module_update_markers(void)
 {
 }
 
+static inline void module_update_tracepoints(void)
+{
+}
+
+static inline int module_get_iter_tracepoints(struct tracepoint_iter *iter)
+{
+        return 0;
+}
+
 #endif /* CONFIG_MODULES */
 
 struct device_driver;
diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h
new file mode 100644
index 000000000000..e623a6fca5c3
--- /dev/null
+++ b/include/linux/tracepoint.h
@@ -0,0 +1,127 @@
+#ifndef _LINUX_TRACEPOINT_H
+#define _LINUX_TRACEPOINT_H
+
+/*
+ * Kernel Tracepoint API.
+ *
+ * See Documentation/tracepoint.txt.
+ *
+ * (C) Copyright 2008 Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
+ *
+ * Heavily inspired from the Linux Kernel Markers.
+ *
+ * This file is released under the GPLv2.
+ * See the file COPYING for more details.
+ */
+
+#include <linux/types.h>
+#include <linux/rcupdate.h>
+
+struct module;
+struct tracepoint;
+
+struct tracepoint {
+        const char *name;               /* Tracepoint name */
+        int state;                      /* State. */
+        void **funcs;
+} __attribute__((aligned(8)));
+
+
+#define TPPROTO(args...)        args
+#define TPARGS(args...)         args
+
+#ifdef CONFIG_TRACEPOINTS
+
+/*
+ * it_func[0] is never NULL because there is at least one element in the array
+ * when the array itself is non NULL.
+ */
+#define __DO_TRACE(tp, proto, args)                                     \
+        do {                                                            \
+                void **it_func;                                         \
+                                                                        \
+                rcu_read_lock_sched();                                  \
+                it_func = rcu_dereference((tp)->funcs);                 \
+                if (it_func) {                                          \
+                        do {                                            \
+                                ((void(*)(proto))(*it_func))(args);     \
+                        } while (*(++it_func));                         \
+                }                                                       \
+                rcu_read_unlock_sched();                                \
+        } while (0)
+
+/*
+ * Make sure the alignment of the structure in the __tracepoints section will
+ * not add unwanted padding between the beginning of the section and the
+ * structure. Force alignment to the same alignment as the section start.
+ */
+#define DEFINE_TRACE(name, proto, args)                                 \
+        static inline void trace_##name(proto)                          \
+        {                                                               \
+                static const char __tpstrtab_##name[]                   \
+                __attribute__((section("__tracepoints_strings")))       \
+                = #name ":" #proto;                                     \
+                static struct tracepoint __tracepoint_##name            \
+                __attribute__((section("__tracepoints"), aligned(8))) = \
+                { __tpstrtab_##name, 0, NULL };                         \
+                if (unlikely(__tracepoint_##name.state))                \
+                        __DO_TRACE(&__tracepoint_##name,                \
+                                TPPROTO(proto), TPARGS(args));          \
+        }                                                               \
+        static inline int register_trace_##name(void (*probe)(proto))   \
+        {                                                               \
+                return tracepoint_probe_register(#name ":" #proto,      \
+                        (void *)probe);                                 \
+        }                                                               \
+        static inline void unregister_trace_##name(void (*probe)(proto))\
+        {                                                               \
+                tracepoint_probe_unregister(#name ":" #proto,           \
+                        (void *)probe);                                 \
+        }
+
+extern void tracepoint_update_probe_range(struct tracepoint *begin,
+        struct tracepoint *end);
+
+#else /* !CONFIG_TRACEPOINTS */
+#define DEFINE_TRACE(name, proto, args)                 \
+        static inline void _do_trace_##name(struct tracepoint *tp, proto) \
+        { }                                                             \
+        static inline void trace_##name(proto)                          \
+        { }                                                             \
+        static inline int register_trace_##name(void (*probe)(proto))   \
+        {                                                               \
+                return -ENOSYS;                                         \
+        }                                                               \
+        static inline void unregister_trace_##name(void (*probe)(proto))\
+        { }
+
+static inline void tracepoint_update_probe_range(struct tracepoint *begin,
+        struct tracepoint *end)
+{ }
+#endif /* CONFIG_TRACEPOINTS */
+
+/*
+ * Connect a probe to a tracepoint.
+ * Internal API, should not be used directly.
+ */
+extern int tracepoint_probe_register(const char *name, void *probe);
+
+/*
+ * Disconnect a probe from a tracepoint.
+ * Internal API, should not be used directly.
+ */
+extern int tracepoint_probe_unregister(const char *name, void *probe);
+
+struct tracepoint_iter {
+        struct module *module;
+        struct tracepoint *tracepoint;
+};
+
+extern void tracepoint_iter_start(struct tracepoint_iter *iter);
+extern void tracepoint_iter_next(struct tracepoint_iter *iter);
+extern void tracepoint_iter_stop(struct tracepoint_iter *iter);
+extern void tracepoint_iter_reset(struct tracepoint_iter *iter);
+extern int tracepoint_get_iter_range(struct tracepoint **tracepoint,
+        struct tracepoint *begin, struct tracepoint *end);
+
+#endif
diff --git a/init/Kconfig b/init/Kconfig
index c11da38837e5..70082678a914 100644
--- a/init/Kconfig
+++ b/init/Kconfig
@@ -771,6 +771,13 @@ config PROFILING
           Say Y here to enable the extended profiling support mechanisms used
           by profilers such as OProfile.
 
+config TRACEPOINTS
+        bool "Activate tracepoints"
+        default y
+        help
+          Place an empty function call at each tracepoint site. Can be
+          dynamically changed for a probe function.
+
 config MARKERS
         bool "Activate markers"
         help
diff --git a/kernel/Makefile b/kernel/Makefile
index 4e1d7df7c3e2..8f9ce7ec21b6 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -83,6 +83,7 @@ obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
 obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
 obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
 obj-$(CONFIG_MARKERS) += marker.o
+obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
 obj-$(CONFIG_LATENCYTOP) += latencytop.o
 obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
 obj-$(CONFIG_FTRACE) += trace/
diff --git a/kernel/module.c b/kernel/module.c
index 9db11911e04b..661d73db786e 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -46,6 +46,7 @@
 #include <asm/cacheflush.h>
 #include <linux/license.h>
 #include <asm/sections.h>
+#include <linux/tracepoint.h>
 
 #if 0
 #define DEBUGP printk
@@ -1831,6 +1832,8 @@ static noinline struct module *load_module(void __user *umod,
 #endif
         unsigned int markersindex;
         unsigned int markersstringsindex;
+        unsigned int tracepointsindex;
+        unsigned int tracepointsstringsindex;
         struct module *mod;
         long err = 0;
         void *percpu = NULL, *ptr = NULL; /* Stops spurious gcc warning */
@@ -2117,6 +2120,9 @@ static noinline struct module *load_module(void __user *umod,
         markersindex = find_sec(hdr, sechdrs, secstrings, "__markers");
         markersstringsindex = find_sec(hdr, sechdrs, secstrings,
                                         "__markers_strings");
+        tracepointsindex = find_sec(hdr, sechdrs, secstrings, "__tracepoints");
+        tracepointsstringsindex = find_sec(hdr, sechdrs, secstrings,
+                                        "__tracepoints_strings");
 
         /* Now do relocations. */
         for (i = 1; i < hdr->e_shnum; i++) {
@@ -2144,6 +2150,12 @@ static noinline struct module *load_module(void __user *umod,
         mod->num_markers =
                 sechdrs[markersindex].sh_size / sizeof(*mod->markers);
 #endif
+#ifdef CONFIG_TRACEPOINTS
+        mod->tracepoints = (void *)sechdrs[tracepointsindex].sh_addr;
+        mod->num_tracepoints =
+                sechdrs[tracepointsindex].sh_size / sizeof(*mod->tracepoints);
+#endif
+
 
         /* Find duplicate symbols */
         err = verify_export_symbols(mod);
@@ -2162,11 +2174,16 @@ static noinline struct module *load_module(void __user *umod,
 
         add_kallsyms(mod, sechdrs, symindex, strindex, secstrings);
 
+        if (!mod->taints) {
 #ifdef CONFIG_MARKERS
-        if (!mod->taints)
                 marker_update_probe_range(mod->markers,
                         mod->markers + mod->num_markers);
 #endif
+#ifdef CONFIG_TRACEPOINTS
+                tracepoint_update_probe_range(mod->tracepoints,
+                        mod->tracepoints + mod->num_tracepoints);
+#endif
+        }
         err = module_finalize(hdr, sechdrs, mod);
         if (err < 0)
                 goto cleanup;
@@ -2717,3 +2734,50 @@ void module_update_markers(void)
         mutex_unlock(&module_mutex);
 }
 #endif
+
+#ifdef CONFIG_TRACEPOINTS
+void module_update_tracepoints(void)
+{
+        struct module *mod;
+
+        mutex_lock(&module_mutex);
+        list_for_each_entry(mod, &modules, list)
+                if (!mod->taints)
+                        tracepoint_update_probe_range(mod->tracepoints,
+                                mod->tracepoints + mod->num_tracepoints);
+        mutex_unlock(&module_mutex);
+}
+
+/*
+ * Returns 0 if current not found.
+ * Returns 1 if current found.
+ */
+int module_get_iter_tracepoints(struct tracepoint_iter *iter)
+{
+        struct module *iter_mod;
+        int found = 0;
+
+        mutex_lock(&module_mutex);
+        list_for_each_entry(iter_mod, &modules, list) {
+                if (!iter_mod->taints) {
+                        /*
+                         * Sorted module list
+                         */
+                        if (iter_mod < iter->module)
+                                continue;
+                        else if (iter_mod > iter->module)
+                                iter->tracepoint = NULL;
+                        found = tracepoint_get_iter_range(&iter->tracepoint,
+                                iter_mod->tracepoints,
+                                iter_mod->tracepoints
+                                        + iter_mod->num_tracepoints);
+                        if (found) {
+                                iter->module = iter_mod;
+                                break;
+                        }
+                }
+        }
+        mutex_unlock(&module_mutex);
+        return found;
+}
+#endif
diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
new file mode 100644
index 000000000000..42e86ddbd2a0
--- /dev/null
+++ b/kernel/tracepoint.c
@@ -0,0 +1,476 @@
+/*
+ * Copyright (C) 2008 Mathieu Desnoyers
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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/module.h>
+#include <linux/mutex.h>
+#include <linux/types.h>
+#include <linux/jhash.h>
+#include <linux/list.h>
+#include <linux/rcupdate.h>
+#include <linux/tracepoint.h>
+#include <linux/err.h>
+#include <linux/slab.h>
+
+extern struct tracepoint __start___tracepoints[];
+extern struct tracepoint __stop___tracepoints[];
+
+/* Set to 1 to enable tracepoint debug output */
+static const int tracepoint_debug;
+
+/*
+ * tracepoints_mutex nests inside module_mutex. Tracepoints mutex protects the
+ * builtin and module tracepoints and the hash table.
+ */
+static DEFINE_MUTEX(tracepoints_mutex);
+
+/*
+ * Tracepoint hash table, containing the active tracepoints.
+ * Protected by tracepoints_mutex.
+ */
+#define TRACEPOINT_HASH_BITS 6
+#define TRACEPOINT_TABLE_SIZE (1 << TRACEPOINT_HASH_BITS)
+
+/*
+ * Note about RCU :
+ * It is used to to delay the free of multiple probes array until a quiescent
+ * state is reached.
+ * Tracepoint entries modifications are protected by the tracepoints_mutex.
+ */
+struct tracepoint_entry {
+        struct hlist_node hlist;
+        void **funcs;
+        int refcount;   /* Number of times armed. 0 if disarmed. */
+        struct rcu_head rcu;
+        void *oldptr;
+        unsigned char rcu_pending:1;
+        char name[0];
+};
+
+static struct hlist_head tracepoint_table[TRACEPOINT_TABLE_SIZE];
+
+static void free_old_closure(struct rcu_head *head)
+{
+        struct tracepoint_entry *entry = container_of(head,
+                struct tracepoint_entry, rcu);
+        kfree(entry->oldptr);
+        /* Make sure we free the data before setting the pending flag to 0 */
+        smp_wmb();
+        entry->rcu_pending = 0;
+}
+
+static void tracepoint_entry_free_old(struct tracepoint_entry *entry, void *old)
+{
+        if (!old)
+                return;
+        entry->oldptr = old;
+        entry->rcu_pending = 1;
+        /* write rcu_pending before calling the RCU callback */
+        smp_wmb();
+#ifdef CONFIG_PREEMPT_RCU
+        synchronize_sched();    /* Until we have the call_rcu_sched() */
+#endif
+        call_rcu(&entry->rcu, free_old_closure);
+}
+
+static void debug_print_probes(struct tracepoint_entry *entry)
+{
+        int i;
+
+        if (!tracepoint_debug)
+                return;
+
+        for (i = 0; entry->funcs[i]; i++)
+                printk(KERN_DEBUG "Probe %d : %p\n", i, entry->funcs[i]);
+}
+
+static void *
+tracepoint_entry_add_probe(struct tracepoint_entry *entry, void *probe)
+{
+        int nr_probes = 0;
+        void **old, **new;
+
+        WARN_ON(!probe);
+
+        debug_print_probes(entry);
+        old = entry->funcs;
+        if (old) {
+                /* (N -> N+1), (N != 0, 1) probes */
+                for (nr_probes = 0; old[nr_probes]; nr_probes++)
+                        if (old[nr_probes] == probe)
+                                return ERR_PTR(-EEXIST);
+        }
+        /* + 2 : one for new probe, one for NULL func */
+        new = kzalloc((nr_probes + 2) * sizeof(void *), GFP_KERNEL);
+        if (new == NULL)
+                return ERR_PTR(-ENOMEM);
+        if (old)
+                memcpy(new, old, nr_probes * sizeof(void *));
+        new[nr_probes] = probe;
+        entry->refcount = nr_probes + 1;
+        entry->funcs = new;
+        debug_print_probes(entry);
+        return old;
+}
+
+static void *
+tracepoint_entry_remove_probe(struct tracepoint_entry *entry, void *probe)
+{
+        int nr_probes = 0, nr_del = 0, i;
+        void **old, **new;
+
+        old = entry->funcs;
+
+        debug_print_probes(entry);
+        /* (N -> M), (N > 1, M >= 0) probes */
+        for (nr_probes = 0; old[nr_probes]; nr_probes++) {
+                if ((!probe || old[nr_probes] == probe))
+                        nr_del++;
+        }
+
+        if (nr_probes - nr_del == 0) {
+                /* N -> 0, (N > 1) */
+                entry->funcs = NULL;
+                entry->refcount = 0;
+                debug_print_probes(entry);
+                return old;
+        } else {
+                int j = 0;
+                /* N -> M, (N > 1, M > 0) */
+                /* + 1 for NULL */
+                new = kzalloc((nr_probes - nr_del + 1)
+                        * sizeof(void *), GFP_KERNEL);
+                if (new == NULL)
+                        return ERR_PTR(-ENOMEM);
+                for (i = 0; old[i]; i++)
+                        if ((probe && old[i] != probe))
+                                new[j++] = old[i];
+                entry->refcount = nr_probes - nr_del;
+                entry->funcs = new;
+        }
+        debug_print_probes(entry);
+        return old;
+}
+
+/*
+ * Get tracepoint if the tracepoint is present in the tracepoint hash table.
+ * Must be called with tracepoints_mutex held.
+ * Returns NULL if not present.
+ */
+static struct tracepoint_entry *get_tracepoint(const char *name)
+{
+        struct hlist_head *head;
+        struct hlist_node *node;
+        struct tracepoint_entry *e;
+        u32 hash = jhash(name, strlen(name), 0);
+
+        head = &tracepoint_table[hash & ((1 << TRACEPOINT_HASH_BITS)-1)];
+        hlist_for_each_entry(e, node, head, hlist) {
+                if (!strcmp(name, e->name))
+                        return e;
+        }
+        return NULL;
+}
+
+/*
+ * Add the tracepoint to the tracepoint hash table. Must be called with
+ * tracepoints_mutex held.
+ */
+static struct tracepoint_entry *add_tracepoint(const char *name)
+{
+        struct hlist_head *head;
+        struct hlist_node *node;
+        struct tracepoint_entry *e;
+        size_t name_len = strlen(name) + 1;
+        u32 hash = jhash(name, name_len-1, 0);
+
+        head = &tracepoint_table[hash & ((1 << TRACEPOINT_HASH_BITS)-1)];
+        hlist_for_each_entry(e, node, head, hlist) {
+                if (!strcmp(name, e->name)) {
+                        printk(KERN_NOTICE
+                                "tracepoint %s busy\n", name);
+                        return ERR_PTR(-EEXIST);        /* Already there */
+                }
+        }
+        /*
+         * Using kmalloc here to allocate a variable length element. Could
+         * cause some memory fragmentation if overused.
+         */
+        e = kmalloc(sizeof(struct tracepoint_entry) + name_len, GFP_KERNEL);
+        if (!e)
+                return ERR_PTR(-ENOMEM);
+        memcpy(&e->name[0], name, name_len);
+        e->funcs = NULL;
+        e->refcount = 0;
+        e->rcu_pending = 0;
+        hlist_add_head(&e->hlist, head);
+        return e;
+}
+
+/*
+ * Remove the tracepoint from the tracepoint hash table. Must be called with
+ * mutex_lock held.
+ */
+static int remove_tracepoint(const char *name)
+{
+        struct hlist_head *head;
+        struct hlist_node *node;
+        struct tracepoint_entry *e;
+        int found = 0;
+        size_t len = strlen(name) + 1;
+        u32 hash = jhash(name, len-1, 0);
+
+        head = &tracepoint_table[hash & ((1 << TRACEPOINT_HASH_BITS)-1)];
+        hlist_for_each_entry(e, node, head, hlist) {
+                if (!strcmp(name, e->name)) {
+                        found = 1;
+                        break;
+                }
+        }
+        if (!found)
+                return -ENOENT;
+        if (e->refcount)
+                return -EBUSY;
+        hlist_del(&e->hlist);
+        /* Make sure the call_rcu has been executed */
+        if (e->rcu_pending)
+                rcu_barrier();
+        kfree(e);
+        return 0;
+}
+
+/*
+ * Sets the probe callback corresponding to one tracepoint.
+ */
+static void set_tracepoint(struct tracepoint_entry **entry,
+        struct tracepoint *elem, int active)
+{
+        WARN_ON(strcmp((*entry)->name, elem->name) != 0);
+
+        /*
+         * rcu_assign_pointer has a smp_wmb() which makes sure that the new
+         * probe callbacks array is consistent before setting a pointer to it.
+         * This array is referenced by __DO_TRACE from
+         * include/linux/tracepoints.h. A matching smp_read_barrier_depends()
+         * is used.
+         */
+        rcu_assign_pointer(elem->funcs, (*entry)->funcs);
+        elem->state = active;
+}
+
+/*
+ * Disable a tracepoint and its probe callback.
+ * Note: only waiting an RCU period after setting elem->call to the empty
+ * function insures that the original callback is not used anymore. This insured
+ * by preempt_disable around the call site.
+ */
+static void disable_tracepoint(struct tracepoint *elem)
+{
+        elem->state = 0;
+}
+
+/**
+ * tracepoint_update_probe_range - Update a probe range
+ * @begin: beginning of the range
+ * @end: end of the range
+ *
+ * Updates the probe callback corresponding to a range of tracepoints.
+ */
+void tracepoint_update_probe_range(struct tracepoint *begin,
+        struct tracepoint *end)
+{
+        struct tracepoint *iter;
+        struct tracepoint_entry *mark_entry;
+
+        mutex_lock(&tracepoints_mutex);
+        for (iter = begin; iter < end; iter++) {
+                mark_entry = get_tracepoint(iter->name);
+                if (mark_entry) {
+                        set_tracepoint(&mark_entry, iter,
+                                        !!mark_entry->refcount);
+                } else {
+                        disable_tracepoint(iter);
+                }
+        }
+        mutex_unlock(&tracepoints_mutex);
+}
+
+/*
+ * Update probes, removing the faulty probes.
+ */
+static void tracepoint_update_probes(void)
+{
+        /* Core kernel tracepoints */
+        tracepoint_update_probe_range(__start___tracepoints,
+                __stop___tracepoints);
+        /* tracepoints in modules. */
+        module_update_tracepoints();
+}
+
+/**
+ * tracepoint_probe_register -  Connect a probe to a tracepoint
+ * @name: tracepoint name
+ * @probe: probe handler
+ *
+ * Returns 0 if ok, error value on error.
+ * The probe address must at least be aligned on the architecture pointer size.
+ */
+int tracepoint_probe_register(const char *name, void *probe)
+{
+        struct tracepoint_entry *entry;
+        int ret = 0;
+        void *old;
+
+        mutex_lock(&tracepoints_mutex);
+        entry = get_tracepoint(name);
+        if (!entry) {
+                entry = add_tracepoint(name);
+                if (IS_ERR(entry)) {
+                        ret = PTR_ERR(entry);
+                        goto end;
+                }
+        }
+        /*
+         * If we detect that a call_rcu is pending for this tracepoint,
+         * make sure it's executed now.
+         */
+        if (entry->rcu_pending)
+                rcu_barrier();
+        old = tracepoint_entry_add_probe(entry, probe);
+        if (IS_ERR(old)) {
+                ret = PTR_ERR(old);
+                goto end;
+        }
+        mutex_unlock(&tracepoints_mutex);
+        tracepoint_update_probes();             /* may update entry */
+        mutex_lock(&tracepoints_mutex);
+        entry = get_tracepoint(name);
+        WARN_ON(!entry);
+        tracepoint_entry_free_old(entry, old);
+end:
+        mutex_unlock(&tracepoints_mutex);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_register);
+
+/**
+ * tracepoint_probe_unregister -  Disconnect a probe from a tracepoint
+ * @name: tracepoint name
+ * @probe: probe function pointer
+ *
+ * We do not need to call a synchronize_sched to make sure the probes have
+ * finished running before doing a module unload, because the module unload
+ * itself uses stop_machine(), which insures that every preempt disabled section
+ * have finished.
+ */
+int tracepoint_probe_unregister(const char *name, void *probe)
+{
+        struct tracepoint_entry *entry;
+        void *old;
+        int ret = -ENOENT;
+
+        mutex_lock(&tracepoints_mutex);
+        entry = get_tracepoint(name);
+        if (!entry)
+                goto end;
+        if (entry->rcu_pending)
+                rcu_barrier();
+        old = tracepoint_entry_remove_probe(entry, probe);
+        mutex_unlock(&tracepoints_mutex);
+        tracepoint_update_probes();             /* may update entry */
+        mutex_lock(&tracepoints_mutex);
+        entry = get_tracepoint(name);
+        if (!entry)
+                goto end;
+        tracepoint_entry_free_old(entry, old);
+        remove_tracepoint(name);        /* Ignore busy error message */
+        ret = 0;
+end:
+        mutex_unlock(&tracepoints_mutex);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(tracepoint_probe_unregister);
+
+/**
+ * tracepoint_get_iter_range - Get a next tracepoint iterator given a range.
+ * @tracepoint: current tracepoints (in), next tracepoint (out)
+ * @begin: beginning of the range
+ * @end: end of the range
+ *
+ * Returns whether a next tracepoint has been found (1) or not (0).
+ * Will return the first tracepoint in the range if the input tracepoint is
+ * NULL.
+ */
+int tracepoint_get_iter_range(struct tracepoint **tracepoint,
+        struct tracepoint *begin, struct tracepoint *end)
+{
+        if (!*tracepoint && begin != end) {
+                *tracepoint = begin;
+                return 1;
+        }
+        if (*tracepoint >= begin && *tracepoint < end)
+                return 1;
+        return 0;
+}
+EXPORT_SYMBOL_GPL(tracepoint_get_iter_range);
+
+static void tracepoint_get_iter(struct tracepoint_iter *iter)
+{
+        int found = 0;
+
+        /* Core kernel tracepoints */
+        if (!iter->module) {
+                found = tracepoint_get_iter_range(&iter->tracepoint,
+                                __start___tracepoints, __stop___tracepoints);
+                if (found)
+                        goto end;
+        }
+        /* tracepoints in modules. */
+        found = module_get_iter_tracepoints(iter);
+end:
+        if (!found)
+                tracepoint_iter_reset(iter);
+}
+
+void tracepoint_iter_start(struct tracepoint_iter *iter)
+{
+        tracepoint_get_iter(iter);
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_start);
+
+void tracepoint_iter_next(struct tracepoint_iter *iter)
+{
+        iter->tracepoint++;
+        /*
+         * iter->tracepoint may be invalid because we blindly incremented it.
+         * Make sure it is valid by marshalling on the tracepoints, getting the
+         * tracepoints from following modules if necessary.
+         */
+        tracepoint_get_iter(iter);
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_next);
+
+void tracepoint_iter_stop(struct tracepoint_iter *iter)
+{
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_stop);
+
+void tracepoint_iter_reset(struct tracepoint_iter *iter)
+{
+        iter->module = NULL;
+        iter->tracepoint = NULL;
+}
+EXPORT_SYMBOL_GPL(tracepoint_iter_reset);