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| author | Ingo Molnar <mingo@elte.hu> | 2009-03-20 11:05:04 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-20 11:09:27 +0100 |
| commit | 505f2b970b2269ce4cb669b3ff4f6479d379cec2 (patch) | |
| tree | 741b9ed4752d852eb8b01dd4b4be765c9f37015e /kernel | |
| parent | 22de89b371a18086162eacd9f8c960299334ab01 (diff) | |
| download | lwn-505f2b970b2269ce4cb669b3ff4f6479d379cec2.tar.gz lwn-505f2b970b2269ce4cb669b3ff4f6479d379cec2.zip | |
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>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/extable.c | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/kernel/extable.c b/kernel/extable.c index 0df6253730be..25d39b0c3a1b 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[]; |