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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) <rostedt@goodmis.org>
This commit is contained in:
Steven Rostedt (VMware) 2021-06-17 16:20:41 -04:00
parent f38601368f
commit 2db7ab6b4c
1 changed files with 2 additions and 2 deletions
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4
kernel/trace/trace.c
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@ -197,12 +197,12 @@ __setup("ftrace=", set_cmdline_ftrace);
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;
}