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-rw-r--r--arch/i386/kernel/traps.c46
-rw-r--r--arch/x86_64/kernel/traps.c51
-rw-r--r--include/asm-i386/unwind.h8
-rw-r--r--include/asm-x86_64/unwind.h8
-rw-r--r--include/linux/unwind.h8
-rw-r--r--kernel/unwind.c7
6 files changed, 83 insertions, 45 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c
index 286584667865..78464097470a 100644
--- a/arch/i386/kernel/traps.c
+++ b/arch/i386/kernel/traps.c
@@ -93,6 +93,7 @@ asmlinkage void spurious_interrupt_bug(void);
asmlinkage void machine_check(void);
static int kstack_depth_to_print = 24;
+static int call_trace = 1;
ATOMIC_NOTIFIER_HEAD(i386die_chain);
int register_die_notifier(struct notifier_block *nb)
@@ -171,40 +172,47 @@ static inline unsigned long print_context_stack(struct thread_info *tinfo,
return ebp;
}
-static asmlinkage void show_trace_unwind(struct unwind_frame_info *info, void *log_lvl)
+static asmlinkage int show_trace_unwind(struct unwind_frame_info *info, void *log_lvl)
{
+ int n = 0;
int printed = 0; /* nr of entries already printed on current line */
while (unwind(info) == 0 && UNW_PC(info)) {
+ ++n;
printed = print_addr_and_symbol(UNW_PC(info), log_lvl, printed);
if (arch_unw_user_mode(info))
break;
}
if (printed)
printk("\n");
+ return n;
}
static void show_trace_log_lvl(struct task_struct *task, struct pt_regs *regs,
unsigned long *stack, char *log_lvl)
{
unsigned long ebp;
- struct unwind_frame_info info;
if (!task)
task = current;
- if (regs) {
- if (unwind_init_frame_info(&info, task, regs) == 0) {
- show_trace_unwind(&info, log_lvl);
- return;
+ if (call_trace >= 0) {
+ int unw_ret = 0;
+ struct unwind_frame_info info;
+
+ if (regs) {
+ if (unwind_init_frame_info(&info, task, regs) == 0)
+ unw_ret = show_trace_unwind(&info, log_lvl);
+ } else if (task == current)
+ unw_ret = unwind_init_running(&info, show_trace_unwind, log_lvl);
+ else {
+ if (unwind_init_blocked(&info, task) == 0)
+ unw_ret = show_trace_unwind(&info, log_lvl);
}
- } else if (task == current) {
- if (unwind_init_running(&info, show_trace_unwind, log_lvl) == 0)
- return;
- } else {
- if (unwind_init_blocked(&info, task) == 0) {
- show_trace_unwind(&info, log_lvl);
- return;
+ if (unw_ret > 0) {
+ if (call_trace > 0)
+ return;
+ printk("%sLegacy call trace:\n", log_lvl);
}
}
@@ -1245,3 +1253,15 @@ static int __init kstack_setup(char *s)
return 1;
}
__setup("kstack=", kstack_setup);
+
+static int __init call_trace_setup(char *s)
+{
+ if (strcmp(s, "old") == 0)
+ call_trace = -1;
+ else if (strcmp(s, "both") == 0)
+ call_trace = 0;
+ else if (strcmp(s, "new") == 0)
+ call_trace = 1;
+ return 1;
+}
+__setup("call_trace=", call_trace_setup);
diff --git a/arch/x86_64/kernel/traps.c b/arch/x86_64/kernel/traps.c
index eb1534ff1f5f..bd0891f4c2c7 100644
--- a/arch/x86_64/kernel/traps.c
+++ b/arch/x86_64/kernel/traps.c
@@ -107,6 +107,7 @@ static inline void preempt_conditional_cli(struct pt_regs *regs)
}
static int kstack_depth_to_print = 10;
+static int call_trace = 1;
#ifdef CONFIG_KALLSYMS
#include <linux/kallsyms.h>
@@ -190,11 +191,12 @@ static unsigned long *in_exception_stack(unsigned cpu, unsigned long stack,
return NULL;
}
-static void show_trace_unwind(struct unwind_frame_info *info, void *context)
+static int show_trace_unwind(struct unwind_frame_info *info, void *context)
{
- int i = 11;
+ int i = 11, n = 0;
while (unwind(info) == 0 && UNW_PC(info)) {
+ ++n;
if (i > 50) {
printk("\n ");
i = 7;
@@ -205,6 +207,7 @@ static void show_trace_unwind(struct unwind_frame_info *info, void *context)
break;
}
printk("\n");
+ return n;
}
/*
@@ -218,27 +221,32 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
{
const unsigned cpu = safe_smp_processor_id();
unsigned long *irqstack_end = (unsigned long *)cpu_pda(cpu)->irqstackptr;
- int i;
+ int i = 11;
unsigned used = 0;
- struct unwind_frame_info info;
printk("\nCall Trace:");
if (!tsk)
tsk = current;
- if (regs) {
- if (unwind_init_frame_info(&info, tsk, regs) == 0) {
- show_trace_unwind(&info, NULL);
- return;
+ if (call_trace >= 0) {
+ int unw_ret = 0;
+ struct unwind_frame_info info;
+
+ if (regs) {
+ if (unwind_init_frame_info(&info, tsk, regs) == 0)
+ unw_ret = show_trace_unwind(&info, NULL);
+ } else if (tsk == current)
+ unw_ret = unwind_init_running(&info, show_trace_unwind, NULL);
+ else {
+ if (unwind_init_blocked(&info, tsk) == 0)
+ unw_ret = show_trace_unwind(&info, NULL);
}
- } else if (tsk == current) {
- if (unwind_init_running(&info, show_trace_unwind, NULL) == 0)
- return;
- } else {
- if (unwind_init_blocked(&info, tsk) == 0) {
- show_trace_unwind(&info, NULL);
- return;
+ if (unw_ret > 0) {
+ if (call_trace > 0)
+ return;
+ printk("Legacy call trace:");
+ i = 18;
}
}
@@ -264,7 +272,7 @@ void show_trace(struct task_struct *tsk, struct pt_regs *regs, unsigned long * s
} \
} while (0)
- for(i = 11; ; ) {
+ for(; ; ) {
const char *id;
unsigned long *estack_end;
estack_end = in_exception_stack(cpu, (unsigned long)stack,
@@ -1052,3 +1060,14 @@ static int __init kstack_setup(char *s)
}
__setup("kstack=", kstack_setup);
+static int __init call_trace_setup(char *s)
+{
+ if (strcmp(s, "old") == 0)
+ call_trace = -1;
+ else if (strcmp(s, "both") == 0)
+ call_trace = 0;
+ else if (strcmp(s, "new") == 0)
+ call_trace = 1;
+ return 1;
+}
+__setup("call_trace=", call_trace_setup);
diff --git a/include/asm-i386/unwind.h b/include/asm-i386/unwind.h
index 1c076897ac21..d480f2e38215 100644
--- a/include/asm-i386/unwind.h
+++ b/include/asm-i386/unwind.h
@@ -66,10 +66,10 @@ static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
info->regs.xes = __USER_DS;
}
-extern asmlinkage void arch_unwind_init_running(struct unwind_frame_info *,
- asmlinkage void (*callback)(struct unwind_frame_info *,
- void *arg),
- void *arg);
+extern asmlinkage int arch_unwind_init_running(struct unwind_frame_info *,
+ asmlinkage int (*callback)(struct unwind_frame_info *,
+ void *arg),
+ void *arg);
static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
{
diff --git a/include/asm-x86_64/unwind.h b/include/asm-x86_64/unwind.h
index 4f61de246179..f3e7124effe3 100644
--- a/include/asm-x86_64/unwind.h
+++ b/include/asm-x86_64/unwind.h
@@ -75,10 +75,10 @@ static inline void arch_unw_init_blocked(struct unwind_frame_info *info)
info->regs.ss = __KERNEL_DS;
}
-extern void arch_unwind_init_running(struct unwind_frame_info *,
- void (*callback)(struct unwind_frame_info *,
- void *arg),
- void *arg);
+extern int arch_unwind_init_running(struct unwind_frame_info *,
+ int (*callback)(struct unwind_frame_info *,
+ void *arg),
+ void *arg);
static inline int arch_unw_user_mode(const struct unwind_frame_info *info)
{
diff --git a/include/linux/unwind.h b/include/linux/unwind.h
index 0295aa789ab4..13c7b2cd87ce 100644
--- a/include/linux/unwind.h
+++ b/include/linux/unwind.h
@@ -49,8 +49,8 @@ extern int unwind_init_blocked(struct unwind_frame_info *,
* Prepare to unwind the currently running thread.
*/
extern int unwind_init_running(struct unwind_frame_info *,
- asmlinkage void (*callback)(struct unwind_frame_info *,
- void *arg),
+ asmlinkage int (*callback)(struct unwind_frame_info *,
+ void *arg),
void *arg);
/*
@@ -97,8 +97,8 @@ static inline int unwind_init_blocked(struct unwind_frame_info *info,
}
static inline int unwind_init_running(struct unwind_frame_info *info,
- asmlinkage void (*cb)(struct unwind_frame_info *,
- void *arg),
+ asmlinkage int (*cb)(struct unwind_frame_info *,
+ void *arg),
void *arg)
{
return -ENOSYS;
diff --git a/kernel/unwind.c b/kernel/unwind.c
index d36bcd3ad3b5..0421035272d9 100644
--- a/kernel/unwind.c
+++ b/kernel/unwind.c
@@ -885,14 +885,13 @@ EXPORT_SYMBOL(unwind_init_blocked);
* Prepare to unwind the currently running thread.
*/
int unwind_init_running(struct unwind_frame_info *info,
- asmlinkage void (*callback)(struct unwind_frame_info *,
- void *arg),
+ asmlinkage int (*callback)(struct unwind_frame_info *,
+ void *arg),
void *arg)
{
info->task = current;
- arch_unwind_init_running(info, callback, arg);
- return 0;
+ return arch_unwind_init_running(info, callback, arg);
}
EXPORT_SYMBOL(unwind_init_running);

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