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Subject[PATCH] checkpatch: Prefer ftrace over function entry/exit printks
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Prefer using ftrace over function entry/exit logging messages.

Warn with various function entry/exit only logging that only
use __func__ with or without descriptive decoration.

Signed-off-by: Joe Perches <joe@perches.com>
---
scripts/checkpatch.pl | 35 +++++++++++++++++++++++++++++++++++
1 file changed, 35 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index e6857bdfcb2d..7c95f23352ae 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -507,6 +507,30 @@ our $signature_tags = qr{(?xi:
Cc:
)};

+our $tracing_logging_tags = qr{(?xi:
+ [=-]*> |
+ <[=-]* |
+ \[ |
+ \] |
+ start |
+ called |
+ entered |
+ entry |
+ enter |
+ in |
+ inside |
+ here |
+ begin |
+ exit |
+ end |
+ done |
+ leave |
+ completed |
+ out |
+ return |
+ [\.\!:\s]*
+)};
+
sub edit_distance_min {
my (@arr) = @_;
my $len = scalar @arr;
@@ -5981,6 +6005,17 @@ sub process {
"Prefer using '\"%s...\", __func__' to using '$context_function', this function's name, in a string\n" . $herecurr);
}

+# check for unnecessary function tracing like uses
+# This does not use $logFunctions because there are many instances like
+# 'dprintk(FOO, "%s()\n", __func__);' which do not match $logFunctions
+ if ($rawline =~ /^\+.*\([^"]*"$tracing_logging_tags{0,3}%s(?:\s*\(\s*\)\s*)?$tracing_logging_tags{0,3}(?:\\n)?"\s*,\s*__func__\s*\)\s*;/) {
+ if (WARN("TRACING_LOGGING",
+ "Unnecessary ftrace-like logging - prefer using ftrace\n" . $herecurr) &&
+ $fix) {
+ fix_delete_line($fixlinenr, $rawline);
+ }
+ }
+
# check for spaces before a quoted newline
if ($rawline =~ /^.*\".*\s\\n/) {
if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
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