tracing, Text Edit Lock: Fix one sparse warning in kernel/extable.c

[linux-2.6.git] / kernel / extable.c

diff --git a/kernel/extable.c b/kernel/extable.c
index e136ed8d82ba56ab81283a48fe3d6cfb41c23c79..b54a6017b6b57bd77919fedd865b6bba24fcac8e 100644 (file)
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -15,11 +15,22 @@
     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/ftrace.h>
+#include <linux/memory.h>
 #include <linux/module.h>
+#include <linux/mutex.h>
 #include <linux/init.h>
-#include <linux/ftrace.h>
-#include <asm/uaccess.h>
+
 #include <asm/sections.h>
+#include <asm/uaccess.h>
+
+/*
+ * mutex protecting text section modification (dynamic code patching).
+ * some users need to sleep (allocating memory...) while they hold this lock.
+ *
+ * NOT exported to modules - patching kernel text is a really delicate matter.
+ */
+DEFINE_MUTEX(text_mutex);
 
 extern struct exception_table_entry __start___ex_table[];
 extern struct exception_table_entry __stop___ex_table[];
@@ -41,7 +52,7 @@ const struct exception_table_entry *search_exception_tables(unsigned long addr)
        return e;
 }
 
-__notrace_funcgraph int core_kernel_text(unsigned long addr)
+int core_kernel_text(unsigned long addr)
 {
        if (addr >= (unsigned long)_stext &&
            addr <= (unsigned long)_etext)
@@ -54,7 +65,7 @@ __notrace_funcgraph int core_kernel_text(unsigned long addr)
        return 0;
 }
 
-__notrace_funcgraph int __kernel_text_address(unsigned long addr)
+int __kernel_text_address(unsigned long addr)
 {
        if (core_kernel_text(addr))
                return 1;