linux-kernel - [PATCH] checkpatch: More comprehensive split strings warning

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Date:	Mon, 02 Dec 2013 21:44:17 -0800
From:	Joe Perches <joe@...ches.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...onical.com>
Subject: [PATCH] checkpatch: More comprehensive split strings warning

The current checkpatch test for split strings does
not find several cases that should be found.

For instance:

diff --git a/drivers/net/wireless/iwlwifi/mvm/rs.c b/drivers/net/wireless/iwlwifi/mvm/rs.c
[]
@@ -1868,7 +1865,8 @@ static void rs_rate_scale_perform(struct iwl_mvm *mvm,
 		/* Else poor success; go back to mode in "active" table */
 		} else {
 			IWL_DEBUG_RATE(mvm,
-				       "LQ: GOING BACK TO THE OLD TABLE suc=%d cur-tpt=%d old-tpt=%d\n",
+				       "GOING BACK TO THE OLD TABLE: SR %d "
+				       "cur-tpt %d old-tpt %d\n",
 				       window->success_ratio,
 				       window->average_tpt,
 				      lq_sta->last_tpt);

does not currently emit a warning.

Improve the test to find these cases.

Add more exceptions to reduce false positives for
assembly and octal/hex string constants.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 38be5d5..1d0d5ac 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2049,16 +2049,12 @@ sub process {
 		}
 
 # Check for user-visible strings broken across lines, which breaks the ability
-# to grep for the string.  Limited to strings used as parameters (those
-# following an open parenthesis), which almost completely eliminates false
-# positives, as well as warning only once per parameter rather than once per
-# line of the string.  Make an exception when the previous string ends in a
-# newline (multiple lines in one string constant) or \n\t (common in inline
-# assembly to indent the instruction on the following line).
+# to grep for the string.  Make exceptions when the previous string ends in a
+# newline (multiple lines in one string constant) or '\t', '\r', ';', or '{'
+# (common in inline assembly) or is a octal \123 or hexadecimal \xaf value
 		if ($line =~ /^\+\s*"/ &&
 		    $prevline =~ /"\s*$/ &&
-		    $prevline =~ /\(/ &&
-		    $prevrawline !~ /\\n(?:\\t)*"\s*$/) {
+		    $prevrawline !~ /(?:\\(?:[ntr]|[0-7]{1,3}|x[0-9a-fA-F]{1,2})|;\s*|\{\s*)"\s*$/) {
 			WARN("SPLIT_STRING",
 			     "quoted string split across lines\n" . $hereprev);
 		}


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