tracing: Have ftrace_dump_on_oops kernel parameter take numbers

The kernel parameter for ftrace_dump_on_oops can take a single assignment.
That is, it can be:

ftrace_dump_on_oops or ftrace_dump_on_oops=orig_cpu

But the content in the sysctl file is a number.

0 for disabled
1 for ftrace_dump_on_oops (all CPUs)
2 for ftrace_dump_on_oops (orig CPU)

Allow the kernel command line to take a number as well to match the sysctl
numbers.

That is:

ftrace_dump_on_oops=1 is the same as ftrace_dump_on_oops

and

ftrace_dump_on_oops=2 is the same as ftrace_dump_on_oops=orig_cpu

Signed-off-by: Steven Rostedt (VMware) <[e-mail]>

kernel/trace/trace.c

···
 
 static int __init set_ftrace_dump_on_oops(char *str)
 {
-	if (*str++ != '=' || !*str) {
+	if (*str++ != '=' || !*str || !strcmp("1", str)) {
 		ftrace_dump_on_oops = DUMP_ALL;
 		return 1;
 	}
 
-	if (!strcmp("orig_cpu", str)) {
+	if (!strcmp("orig_cpu", str) || !strcmp("2", str)) {
 		ftrace_dump_on_oops = DUMP_ORIG;
                 return 1;
         }