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tracing: Fix tp_printk option related with tp_printk_stop_on_boot

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[ Upstream commit 3203ce39ac0b2a57a84382ec184c7d4a0bede175 ]

The kernel parameter "tp_printk_stop_on_boot" starts with "tp_printk" which is
the same as another kernel parameter "tp_printk". If "tp_printk" setup is
called before the "tp_printk_stop_on_boot", it will override the latter
and keep it from being set.

This is similar to other kernel parameter issues, such as:
  Commit 745a600cf1a6 ("um: console: Ignore console= option")
or init/do_mounts.c:45 (setup function of "ro" kernel param)

Fix it by checking for a "_" right after the "tp_printk" and if that
exists do not process the parameter.

Link: https://lkml.kernel.org/r/20220208195421.969326-1-jsyoo5b@gmail.com

Signed-off-by: JaeSang Yoo <jsyoo5b@gmail.com>
[ Fixed up change log and added space after if condition ]
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
JaeSang Yoo 2022-02-09 04:54:22 +09:00 committed by Greg Kroah-Hartman
parent e81883667a
commit 7beb744b1e
1 changed files with 4 additions and 0 deletions
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4
kernel/trace/trace.c
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@ -228,6 +228,10 @@ __setup("trace_clock=", set_trace_boot_clock);
static int __init set_tracepoint_printk(char *str)
{
/* Ignore the "tp_printk_stop_on_boot" param */
if (*str == '_')
return 0;
if ((strcmp(str, "=0") != 0 && strcmp(str, "=off") != 0))
tracepoint_printk = 1;
return 1;