[PATCH] checkpatch.pl: Add warning for new __packed additions

[Tom Rini]

While there are valid reasons to use __packed, often the answer is that
you should be doing something else here instead.

Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Josh Triplett <josh@xxxxxxxxxxxxxxxx>
Signed-off-by: Tom Rini <trini@xxxxxx>
---
 scripts/checkpatch.pl |    5 +++++
 1 file changed, 5 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 0ea2a1e..fef3b13 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4010,6 +4010,11 @@ sub process {
 			WARN("PREFER_PACKED",
 			     "__packed is preferred over __attribute__((packed))\n" . $herecurr);
 		}
+# Check for new packed usage, warn to use care
+		if ($line =~ /\b(__attribute__\s*\(\s*\(.*\bpacked|__packed)\b/) {
+			WARN("NEW_PACKED",
+			     "Adding new packed members is to be done with care\n" . $herecurr);
+		}
 
 # Check for __attribute__ aligned, prefer __aligned
 		if ($realfile !~ m@\binclude/uapi/@ &&
-- 
1.7.9.5

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