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authorIngo Molnar <mingo@elte.hu>2006-07-03 00:24:38 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-03 15:27:02 -0700
commit8637c09901049f061b94f684915d4f18ecf91d79 (patch)
tree83ca3ab38ab4d12f4e10176ba01ae33809388767
parentf0a5c315eb266edc608a29971bb4ff1a3025c58f (diff)
downloadop-kernel-dev-8637c09901049f061b94f684915d4f18ecf91d79.zip
op-kernel-dev-8637c09901049f061b94f684915d4f18ecf91d79.tar.gz
[PATCH] lockdep: stacktrace subsystem, core
Framework to generate and save stacktraces quickly, without printing anything to the console. Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Arjan van de Ven <arjan@linux.intel.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--include/linux/stacktrace.h20
-rw-r--r--kernel/Makefile1
-rw-r--r--kernel/stacktrace.c24
-rw-r--r--lib/Kconfig.debug6
4 files changed, 50 insertions, 1 deletions
diff --git a/include/linux/stacktrace.h b/include/linux/stacktrace.h
new file mode 100644
index 0000000..9cc81e5
--- /dev/null
+++ b/include/linux/stacktrace.h
@@ -0,0 +1,20 @@
+#ifndef __LINUX_STACKTRACE_H
+#define __LINUX_STACKTRACE_H
+
+#ifdef CONFIG_STACKTRACE
+struct stack_trace {
+ unsigned int nr_entries, max_entries;
+ unsigned long *entries;
+};
+
+extern void save_stack_trace(struct stack_trace *trace,
+ struct task_struct *task, int all_contexts,
+ unsigned int skip);
+
+extern void print_stack_trace(struct stack_trace *trace, int spaces);
+#else
+# define save_stack_trace(trace, task, all, skip) do { } while (0)
+# define print_stack_trace(trace) do { } while (0)
+#endif
+
+#endif
diff --git a/kernel/Makefile b/kernel/Makefile
index 82fb182..e7fd20e 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -10,6 +10,7 @@ obj-y = sched.o fork.o exec_domain.o panic.o printk.o profile.o \
kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
hrtimer.o
+obj-$(CONFIG_STACKTRACE) += stacktrace.o
obj-y += time/
obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
obj-$(CONFIG_FUTEX) += futex.o
diff --git a/kernel/stacktrace.c b/kernel/stacktrace.c
new file mode 100644
index 0000000..b71816e
--- /dev/null
+++ b/kernel/stacktrace.c
@@ -0,0 +1,24 @@
+/*
+ * kernel/stacktrace.c
+ *
+ * Stack trace management functions
+ *
+ * Copyright (C) 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ */
+#include <linux/sched.h>
+#include <linux/kallsyms.h>
+#include <linux/stacktrace.h>
+
+void print_stack_trace(struct stack_trace *trace, int spaces)
+{
+ int i, j;
+
+ for (i = 0; i < trace->nr_entries; i++) {
+ unsigned long ip = trace->entries[i];
+
+ for (j = 0; j < spaces + 1; j++)
+ printk(" ");
+ print_ip_sym(ip);
+ }
+}
+
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 7b3863d..04e374c 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -107,7 +107,7 @@ config DEBUG_SLAB_LEAK
config DEBUG_PREEMPT
bool "Debug preemptible kernel"
- depends on DEBUG_KERNEL && PREEMPT
+ depends on DEBUG_KERNEL && PREEMPT && TRACE_IRQFLAGS_SUPPORT
default y
help
If you say Y here then the kernel will use a debug variant of the
@@ -149,6 +149,10 @@ config DEBUG_SPINLOCK_SLEEP
If you say Y here, various routines which may sleep will become very
noisy if they are called with a spinlock held.
+config STACKTRACE
+ bool
+ depends on STACKTRACE_SUPPORT
+
config DEBUG_KOBJECT
bool "kobject debugging"
depends on DEBUG_KERNEL
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