diff options
Diffstat (limited to 'runtime/itrace.c')
| -rw-r--r-- | runtime/itrace.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/runtime/itrace.c b/runtime/itrace.c index 97ba427e..69f3bf74 100644 --- a/runtime/itrace.c +++ b/runtime/itrace.c @@ -318,6 +318,19 @@ static int usr_itrace_init(int single_step, pid_t tid, struct stap_itrace_probe struct task_struct *tsk; spin_lock_init(&itrace_lock); + + /* 'arch_has_single_step' needs to be defined for either single step mode + * or branch mode. + */ + if (!arch_has_single_step()) { + printk(KERN_ERR "usr_itrace_init: arch does not support step mode\n"); + return 1; + } + if (!single_step && !arch_has_block_step()) { + printk(KERN_ERR "usr_itrace_init: arch does not support block step mode\n"); + return 1; + } + rcu_read_lock(); #ifdef STAPCONF_FIND_TASK_PID tsk = find_task_by_pid(tid); |