linux-kernel - [tip:tracing/core] tracing, Text Edit Lock - kprobes architecture independent support, nommu fix

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Date:	Sun, 22 Mar 2009 19:39:28 GMT
From:	Ingo Molnar <mingo@...e.hu>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, mathieu.desnoyers@...ymtl.ca,
	hpa@...or.com, mingo@...hat.com, lethal@...ux-sh.org,
	tglx@...utronix.de, sfr@...b.auug.org.au, mingo@...e.hu
Subject: [tip:tracing/core] tracing, Text Edit Lock - kprobes architecture independent support, nommu fix

Commit-ID:  505f2b970b2269ce4cb669b3ff4f6479d379cec2
Gitweb:     http://git.kernel.org/tip/505f2b970b2269ce4cb669b3ff4f6479d379cec2
Author:     Ingo Molnar <mingo@...e.hu>
AuthorDate: Fri, 20 Mar 2009 11:05:04 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Fri, 20 Mar 2009 11:09:27 +0100

tracing, Text Edit Lock - kprobes architecture independent support, nommu fix

Impact: build fix on SH !CONFIG_MMU

Stephen Rothwell reported this linux-next build failure on the SH
architecture:

  kernel/built-in.o: In function `disable_all_kprobes':
  kernel/kprobes.c:1382: undefined reference to `text_mutex'
  [...]

And observed:

| Introduced by commit 4460fdad85becd569f11501ad5b91814814335ff ("tracing,
| Text Edit Lock - kprobes architecture independent support") from the
| tracing tree.  text_mutex is defined in mm/memory.c which is only built
| if CONFIG_MMU is defined, which is not true for sh allmodconfig.

Move this lock to kernel/extable.c (which is already home to various
kernel text related routines), which file is always built-in.

Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
Cc: Paul Mundt <lethal@...ux-sh.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
LKML-Reference: <20090320110602.86351a91.sfr@...b.auug.org.au>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 kernel/extable.c |   14 ++++++++++++--
 mm/memory.c      |    8 --------
 2 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/kernel/extable.c b/kernel/extable.c
index 0df6253..25d39b0 100644
--- a/kernel/extable.c
+++ b/kernel/extable.c
@@ -15,11 +15,21 @@
     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/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[];
diff --git a/mm/memory.c b/mm/memory.c
index 05fab3b..dfc9e4e 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -101,14 +101,6 @@ int randomize_va_space __read_mostly =
 					2;
 #endif
 
-/*
- * 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);
-
 static int __init disable_randmaps(char *s)
 {
 	randomize_va_space = 0;
--
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