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authorJaeSang Yoo <js.yoo.5b@gmail.com>2022-02-09 04:54:22 +0900
committerSteven Rostedt (Google) <rostedt@goodmis.org>2022-02-08 15:47:00 -0500
commit3203ce39ac0b2a57a84382ec184c7d4a0bede175 (patch)
treeae5f1ea0f679577687fecbc16961d233681a1465 /kernel
parent3a92e6de780c7afaa826b80058abd952bb2904d8 (diff)
downloadlinux-3203ce39ac0b2a57a84382ec184c7d4a0bede175.tar.bz2
tracing: Fix tp_printk option related with tp_printk_stop_on_boot
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>
Diffstat (limited to 'kernel')
-rw-r--r--kernel/trace/trace.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c
index c860f582b078..7c2578efde26 100644
--- a/kernel/trace/trace.c
+++ b/kernel/trace/trace.c
@@ -252,6 +252,10 @@ __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;