static struct ftrace_ops *
ftrace_find_tramp_ops_any(struct dyn_ftrace *rec);
+enum ftrace_bug_type ftrace_bug_type;
+
+static void print_bug_type(void)
+{
+ switch (ftrace_bug_type) {
+ case FTRACE_BUG_UNKNOWN:
+ break;
+ case FTRACE_BUG_INIT:
+ pr_info("Initializing ftrace call sites\n");
+ break;
+ case FTRACE_BUG_NOP:
+ pr_info("Setting ftrace call site to NOP\n");
+ break;
+ case FTRACE_BUG_CALL:
+ pr_info("Setting ftrace call site to call ftrace function\n");
+ break;
+ case FTRACE_BUG_UPDATE:
+ pr_info("Updating ftrace call site to call a different ftrace function\n");
+ break;
+ }
+}
+
/**
* ftrace_bug - report and shutdown function tracer
* @failed: The failed type (EFAULT, EINVAL, EPERM)
pr_info("ftrace faulted on unknown error ");
print_ip_sym(ip);
}
+ print_bug_type();
if (rec) {
struct ftrace_ops *ops = NULL;
{
unsigned long flag = 0UL;
+ ftrace_bug_type = FTRACE_BUG_UNKNOWN;
+
/*
* If we are updating calls:
*
* from the save regs, to a non-save regs function or
* vice versa, or from a trampoline call.
*/
- if (flag & FTRACE_FL_ENABLED)
+ if (flag & FTRACE_FL_ENABLED) {
+ ftrace_bug_type = FTRACE_BUG_CALL;
return FTRACE_UPDATE_MAKE_CALL;
+ }
+ ftrace_bug_type = FTRACE_BUG_UPDATE;
return FTRACE_UPDATE_MODIFY_CALL;
}
FTRACE_FL_REGS_EN);
}
+ ftrace_bug_type = FTRACE_BUG_NOP;
return FTRACE_UPDATE_MAKE_NOP;
}
ret = ftrace_update_record(rec, enable);
+ ftrace_bug_type = FTRACE_BUG_UNKNOWN;
+
switch (ret) {
case FTRACE_UPDATE_IGNORE:
return 0;
case FTRACE_UPDATE_MAKE_CALL:
+ ftrace_bug_type = FTRACE_BUG_CALL;
return ftrace_make_call(rec, ftrace_addr);
case FTRACE_UPDATE_MAKE_NOP:
+ ftrace_bug_type = FTRACE_BUG_NOP;
return ftrace_make_nop(NULL, rec, ftrace_old_addr);
case FTRACE_UPDATE_MODIFY_CALL:
+ ftrace_bug_type = FTRACE_BUG_UPDATE;
return ftrace_modify_call(rec, ftrace_old_addr, ftrace_addr);
}
ret = ftrace_make_nop(mod, rec, MCOUNT_ADDR);
if (ret) {
+ ftrace_bug_type = FTRACE_BUG_INIT;
ftrace_bug(ret, rec);
return 0;
}