diff mbox series

[125/156] checkpatch: warn if trace_printk and friends are called

Message ID 20201016024853.NXTjAZOIJ%akpm@linux-foundation.org (mailing list archive)
State New
Headers show
Series [001/156] device-dax/kmem: fix resource release | expand

Commit Message

Andrew Morton Oct. 16, 2020, 2:48 a.m. UTC
From: Nicolas Boichat <drinkcat@chromium.org>
Subject: checkpatch: warn if trace_printk and friends are called

trace_printk is meant as a debugging tool, and should not be compiled into
production code without specific debug Kconfig options enabled, or source
code changes, as indicated by the warning that shows up on boot if any
trace_printk is called:

 **                                                      **
 ** trace_printk() being used. Allocating extra memory.  **
 **                                                      **
 ** This means that this is a DEBUG kernel and it is     **
 ** unsafe for production use.                           **

Let's warn developers when they try to submit such a change.

Link: https://lkml.kernel.org/r/20200825193600.v2.1.I723c43c155f02f726c97501be77984f1e6bb740a@changeid
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

 scripts/checkpatch.pl |    6 ++++++
 1 file changed, 6 insertions(+)
diff mbox series


--- a/scripts/checkpatch.pl~checkpatch-warn-if-trace_printk-and-friends-are-called
+++ a/scripts/checkpatch.pl
@@ -4274,6 +4274,12 @@  sub process {
 			     "Prefer dev_$level(... to dev_printk(KERN_$orig, ...\n" . $herecurr);
+# trace_printk should not be used in production code.
+		if ($line =~ /\b(trace_printk|trace_puts|ftrace_vprintk)\s*\(/) {
+			     "Do not use $1() in production code (this can be ignored if built only with a debug config option)\n" . $herecurr);
+		}
 # ENOSYS means "bad syscall nr" and nothing else.  This will have a small
 # number of false positives, but assembly files are not checked, so at
 # least the arch entry code will not trigger this warning.