linux-kernel - [PATCH] checkpatch: Warn on logging continuations

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Message-Id: <7100ba00098694ec81471a299583ed068975fd05.1483465888.git.joe@perches.com>
Date:   Tue,  3 Jan 2017 09:52:09 -0800
From:   Joe Perches <joe@...ches.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Andy Whitcroft <apw@...onical.com>
Cc:     linux-kernel@...r.kernel.org
Subject: [PATCH] checkpatch: Warn on logging continuations

pr_cont(...) and printk(KERN_CONT ...) uses should be discouraged
as their output can be interleaved by multiple logging processes.

Signed-off-by: Joe Perches <joe@...ches.com>
---
 scripts/checkpatch.pl | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 1579230ebacc..a0909b0229f1 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5268,6 +5268,12 @@ sub process {
 			}
 		}
 
+# check for logging continuations
+		if ($line =~ /\bprintk\s*\(\s*KERN_CONT\b|\bpr_cont\s*\(/) {
+			WARN("LOGGING_CONTINUATION",
+			     "Avoid logging continuation uses where feasible\n" . $herecurr);
+		}
+
 # check for mask then right shift without a parentheses
 		if ($^V && $^V ge 5.10.0 &&
 		    $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
-- 
2.10.0.rc2.1.g053435c