[PATCH] checkpatch: add a rule to check devinitconst mistakes

[Andi Kleen <andi@firstfloor.org>]

From: Andi Kleen <ak@linux.intel.com>

Check for const __devinitdata and non const __devinitconst

People get this regularly wrong and it breaks the LTO builds,
as it causes a section attribute conflict.

This doesn't catch all mistakes -- spreading over multiple lines,
getting const pointers wrong, but hopefully the common ones.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 scripts/checkpatch.pl | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 2ee9eb7..5d68d9c 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -2676,6 +2676,15 @@ sub process {
 			}
 		}
 
+# check for __devinitdata with const or const without __devintconst
+# XXX should scan multiple lines and handle misplaced consts for pointers
+		if ($line =~ /const/ && $line =~ /__(dev)?initdata/) {
+		    ERROR("DEVINITCONST", "const init definition must use __devinitconst");
+		}
+		if ($line =~ /__(dev)?initconst/ && $line !~ /\Wconst\W/) {
+		    ERROR("DEVINITCONST", "__devinitconst must have have const definition");
+		}
+
 # check for spacing round square brackets; allowed:
 #  1. with a type on the left -- int [] a;
 #  2. at the beginning of a line for slice initialisers -- [0...10] = 5,
-- 
1.8.3.1