Messages in this thread Patch in this message | | | Date | Sun, 22 Mar 2009 19:39:28 GMT | From | Ingo Molnar <> | Subject | [tip:tracing/core] tracing, Text Edit Lock - kprobes architecture independent support, nommu fix |
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Commit-ID: 505f2b970b2269ce4cb669b3ff4f6479d379cec2 Gitweb: http://git.kernel.org/tip/505f2b970b2269ce4cb669b3ff4f6479d379cec2 Author: Ingo Molnar <mingo@elte.hu> AuthorDate: Fri, 20 Mar 2009 11:05:04 +0100 Committer: Ingo Molnar <mingo@elte.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@canb.auug.org.au> Cc: Paul Mundt <lethal@linux-sh.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> LKML-Reference: <20090320110602.86351a91.sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar <mingo@elte.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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