From 505f2b970b2269ce4cb669b3ff4f6479d379cec2 Mon Sep 17 00:00:00 2001 From: Ingo Molnar Date: Fri, 20 Mar 2009 11:05:04 +0100 Subject: 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 Cc: Paul Mundt Cc: Mathieu Desnoyers LKML-Reference: <20090320110602.86351a91.sfr@canb.auug.org.au> Signed-off-by: Ingo Molnar --- kernel/extable.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'kernel') diff --git a/kernel/extable.c b/kernel/extable.c index 0df6253730b..25d39b0c3a1 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 #include +#include #include -#include -#include + #include +#include + +/* + * 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[]; -- cgit From 09c9e84d474d917d9de5b9011ed2064b03a19677 Mon Sep 17 00:00:00 2001 From: Frederic Weisbecker Date: Sat, 21 Mar 2009 04:33:36 +0100 Subject: tracing/ring-buffer: don't annotate rb_cpu_notify with __cpuinit Impact: remove a section warning CONFIG_DEBUG_SECTION_MISMATCH raises the following warning on -tip: WARNING: kernel/trace/built-in.o(.text+0x5bc5): Section mismatch in reference from the function ring_buffer_alloc() to the function .cpuinit.text:rb_cpu_notify() The function ring_buffer_alloc() references the function __cpuinit rb_cpu_notify(). This is actually harmless. The code in the ring buffer don't build rb_cpu_notify and other cpu hotplug stuffs when !CONFIG_HOTPLUG_CPU so we have no risk to reference freed memory here (it would even be harmless if we unconditionally build it because register_cpu_notifier would do nothing when !CONFIG_HOTPLUG_CPU. But since ring_buffer_alloc() can be called everytime, we don't want it to be annotated with __cpuinit so we drop the __cpuinit from rb_cpu_notify. This is not a waste of memory because it is only defined and used on CONFIG_HOTPLUG_CPU. Signed-off-by: Frederic Weisbecker Cc: Steven Rostedt LKML-Reference: <1237606416-22268-1-git-send-email-fweisbec@gmail.com> Signed-off-by: Ingo Molnar --- kernel/trace/ring_buffer.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'kernel') diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 384ca5d9d72..808b14bbf07 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -535,8 +535,8 @@ static void rb_free_cpu_buffer(struct ring_buffer_per_cpu *cpu_buffer) extern int ring_buffer_page_too_big(void); #ifdef CONFIG_HOTPLUG_CPU -static int __cpuinit rb_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu); +static int rb_cpu_notify(struct notifier_block *self, + unsigned long action, void *hcpu); #endif /** @@ -2784,8 +2784,8 @@ static __init int rb_init_debugfs(void) fs_initcall(rb_init_debugfs); #ifdef CONFIG_HOTPLUG_CPU -static int __cpuinit rb_cpu_notify(struct notifier_block *self, - unsigned long action, void *hcpu) +static int rb_cpu_notify(struct notifier_block *self, + unsigned long action, void *hcpu) { struct ring_buffer *buffer = container_of(self, struct ring_buffer, cpu_notify); -- cgit