linux-kernel - [for-next][PATCH 09/24] tracing: Have ftrace_dump_on

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Message-ID: <20210626130536.139237977@goodmis.org>
Date:   Sat, 26 Jun 2021 09:04:13 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [for-next][PATCH 09/24] tracing: Have ftrace_dump_on_oops kernel parameter take numbers

From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>

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@...dmis.org>
---
 kernel/trace/trace.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index bbc63ac5b47f..d352fb4b7709 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -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;
         }
-- 
2.30.2