From abb08a53883ed7afbe3f0ac9444805042f473a63 Mon Sep 17 00:00:00 2001
From: Joe Perches <joe@perches.com>
Date: Wed, 10 Dec 2014 15:51:46 -0800
Subject: [PATCH] checkpatch: try to avoid mask and shift errors
Shift has a higher precedence that mask so warn when a mask then shift
operation is done without parentheses around the mask.
This test works well for a right shift, but the left shift is pretty
commonly done correctly so only warn on the right shift.
Signed-off-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
scripts/checkpatch.pl | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 853dc7f9f7516..24d6702a95c28 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4482,6 +4482,14 @@ sub process {
}
}
+# check for mask then right shift without a parentheses
+ if ($^V && $^V ge 5.10.0 &&
+ $line =~ /$LvalOrFunc\s*\&\s*($LvalOrFunc)\s*>>/ &&
+ $4 !~ /^\&/) { # $LvalOrFunc may be &foo, ignore if so
+ WARN("MASK_THEN_SHIFT",
+ "Possible precedence defect with mask then right shift - may need parentheses\n" . $herecurr);
+ }
+
# check for bad placement of section $InitAttribute (e.g.: __initdata)
if ($line =~ /(\b$InitAttribute\b)/) {
my $attr = $1;
--
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