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Date: Thu, 24 Sep 2009 19:17:56 -0400
From: Jason Baron <jbaron@...hat.com>
To: linux-kernel@...r.kernel.org
Cc: mingo@...e.hu, mathieu.desnoyers@...ymtl.ca, tglx@...utronix.de,
rostedt@...dmis.org, ak@...e.de, roland@...hat.com, rth@...hat.com,
mhiramat@...hat.com
Subject: [PATCH 3/4] jump label - add module support
Add module support to jump label patching.
Signed-off-by: Jason Baron <jbaron@...hat.com>
---
arch/x86/kernel/jump_label.c | 4 +++-
include/linux/jump_label.h | 34 ++++++++++++++++++++++++++--------
include/linux/module.h | 12 +++++++++++-
kernel/module.c | 31 +++++++++++++++++++++++++++++++
4 files changed, 71 insertions(+), 10 deletions(-)
diff --git a/arch/x86/kernel/jump_label.c b/arch/x86/kernel/jump_label.c
index 207947d..d057c3f 100644
--- a/arch/x86/kernel/jump_label.c
+++ b/arch/x86/kernel/jump_label.c
@@ -2,6 +2,7 @@
#include <linux/memory.h>
#include <linux/kprobes.h>
#include <linux/uaccess.h>
+#include <linux/module.h>
#ifdef __HAVE_ARCH_JUMP_LABEL
@@ -73,7 +74,7 @@ void jump_label_transform(struct jump_entry *entry, enum jump_label_type type)
mutex_unlock(&text_mutex);
}
-int jump_label_update(const char *name, enum jump_label_type type)
+int jump_label_update(const char *name, enum jump_label_type type, int module_lock)
{
struct jump_entry *iter;
@@ -85,6 +86,7 @@ int jump_label_update(const char *name, enum jump_label_type type)
jump_label_transform(iter, type);
}
}
+ jump_label_update_modules(name, type, module_lock);
mutex_unlock(&jump_label_mutex);
return 0;
}
diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
index eb0a4ef..1033d35 100644
--- a/include/linux/jump_label.h
+++ b/include/linux/jump_label.h
@@ -23,13 +23,22 @@ enum jump_label_instruction {
#ifdef __HAVE_ARCH_JUMP_LABEL
-extern int jump_label_update(const char *name, enum jump_label_type type);
+extern int jump_label_update(const char *name, enum jump_label_type type,
+ int module_lock);
+extern void jump_label_transform(struct jump_entry *entry,
+ enum jump_label_type type);
-#define enable_jump_label(name) \
- jump_label_update(name, JUMP_LABEL_ENABLE);
+#define enable_jump_label_locked(name) \
+ jump_label_update(name, JUMP_LABEL_ENABLE, 1);
-#define disable_jump_label(name) \
- jump_label_update(name, JUMP_LABEL_DISABLE);
+#define disable_jump_label_locked(name) \
+ jump_label_update(name, JUMP_LABEL_DISABLE, 1);
+
+#define enable_jump_label_unlocked(name) \
+ jump_label_update(name, JUMP_LABEL_ENABLE, 0);
+
+#define disable_jump_label_unlocked(name) \
+ jump_label_update(name, JUMP_LABEL_DISABLE, 0);
#else
@@ -37,13 +46,22 @@ extern int jump_label_update(const char *name, enum jump_label_type type);
if (likely(!cond)) \
goto label;
-static inline int enable_jump_label(const char *name, enum jump_label_type type)
+static inline int enable_jump_label_locked(const char *name)
+{
+ return 0;
+}
+
+static inline int disable_jump_label_locked(const char *name)
+{
+ return 0;
+}
+
+static inline int enable_jump_label_unlocked(const char *name)
{
return 0;
}
-static inline int disable_jump_label(const char *name,
- enum jump_label_type type)
+static inline int disable_jump_label_unlocked(const char *name)
{
return 0;
}
diff --git a/include/linux/module.h b/include/linux/module.h
index 86863cd..911f5c9 100644
--- a/include/linux/module.h
+++ b/include/linux/module.h
@@ -17,6 +17,7 @@
#include <linux/moduleparam.h>
#include <linux/marker.h>
#include <linux/tracepoint.h>
+#include <linux/jump_label.h>
#include <asm/local.h>
#include <asm/module.h>
@@ -353,7 +354,10 @@ struct module
struct tracepoint *tracepoints;
unsigned int num_tracepoints;
#endif
-
+#ifdef __HAVE_ARCH_JUMP_LABEL
+ struct jump_entry *jump_entries;
+ unsigned int num_jump_entries;
+#endif
#ifdef CONFIG_TRACING
const char **trace_bprintk_fmt_start;
unsigned int num_trace_bprintk_fmt;
@@ -557,6 +561,7 @@ extern void module_update_markers(void);
extern void module_update_tracepoints(void);
extern int module_get_iter_tracepoints(struct tracepoint_iter *iter);
+extern void jump_label_update_modules(const char *name, enum jump_label_type type, int module_lock);
#else /* !CONFIG_MODULES... */
#define EXPORT_SYMBOL(sym)
@@ -682,6 +687,11 @@ static inline int module_get_iter_tracepoints(struct tracepoint_iter *iter)
return 0;
}
+static inline void jump_label_update_modules(const char *name, enum jump_label_type type, int module_lock)
+{
+ return 0;
+}
+
#endif /* CONFIG_MODULES */
struct device_driver;
diff --git a/kernel/module.c b/kernel/module.c
index 46580ed..01c2343 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -54,6 +54,7 @@
#include <linux/async.h>
#include <linux/percpu.h>
#include <linux/kmemleak.h>
+#include <linux/jump_label.h>
#define CREATE_TRACE_POINTS
#include <trace/events/module.h>
@@ -2247,6 +2248,12 @@ static noinline struct module *load_module(void __user *umod,
sizeof(*mod->tracepoints),
&mod->num_tracepoints);
#endif
+#ifdef __HAVE_ARCH_JUMP_LABEL
+ mod->jump_entries = section_objs(hdr, sechdrs, secstrings,
+ "__jump_table",
+ sizeof(*mod->jump_entries),
+ &mod->num_jump_entries);
+#endif
#ifdef CONFIG_EVENT_TRACING
mod->trace_events = section_objs(hdr, sechdrs, secstrings,
"_ftrace_events",
@@ -3017,4 +3024,28 @@ int module_get_iter_tracepoints(struct tracepoint_iter *iter)
mutex_unlock(&module_mutex);
return found;
}
+
+#endif
+
+#ifdef __HAVE_ARCH_JUMP_LABEL
+
+void jump_label_update_modules(const char *name, enum jump_label_type type, int module_lock)
+{
+ struct module *iter_mod;
+ struct jump_entry *entry;
+
+ if (!module_lock)
+ mutex_lock(&module_mutex);
+ list_for_each_entry(iter_mod, &modules, list) {
+ for(entry = iter_mod->jump_entries;
+ entry < iter_mod->jump_entries + iter_mod->num_jump_entries;
+ entry++) {
+ if (!strcmp(name, entry->name))
+ jump_label_transform(entry, type);
+ }
+ }
+ if (!module_lock)
+ mutex_unlock(&module_mutex);
+}
+
#endif
--
1.6.2.5
--
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