checkpatch: check for #if 0/#if 1

The #if 0 or #if 1 is used to toggle features. Warn if #if 0 or #if 1
is present and suggest that they can be removed.

[akpm@linux-foundation.org: fix spacing around periods, per Joe\
Link: http://lkml.kernel.org/r/1532625218-24321-1-git-send-email-pheragu@codeaurora.org
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
Signed-off-by: Prakruthi Deepak Heragu <pheragu@codeaurora.org>
Acked-by: Joe Perches <joe@perches.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index d43a446..b5eade9 100755 (executable)
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -5422,9 +5422,14 @@ sub process {
 
 # warn about #if 0
                if ($line =~ /^.\s*\#\s*if\s+0\b/) {
-                       CHK("REDUNDANT_CODE",
-                           "if this code is redundant consider removing it\n" .
-                               $herecurr);
+                       WARN("IF_0",
+                            "Consider removing the code enclosed by this #if 0 and its #endif\n" . $herecurr);
+               }
+
+# warn about #if 1
+               if ($line =~ /^.\s*\#\s*if\s+1\b/) {
+                       WARN("IF_1",
+                            "Consider removing the #if 1 and its #endif\n" . $herecurr);
                }
 
 # check for needless "if (<foo>) fn(<foo>)" uses