From: Joe Perches <joe@perches.com>
Date: Thu, 16 Apr 2015 19:44:42 +0000 (-0700)
Subject: checkpatch: add a test for const with __read_mostly uses
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=c17893c7407fbe988f5901596c3e5e75c0dc0f67;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

checkpatch: add a test for const with __read_mostly uses

const objects shouldn't be __read_mostly.  They are read-only.

Marking these objects as __read_mostly causes section conflicts with LTO
linking.

So add a test to try to avoid this issue.

Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@shadowen.org>
Cc: Andi Kleen <andi@firstfloor.org>
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 78a951f80706..28516587baba 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -4791,6 +4791,16 @@ sub process {
 			}
 		}
 
+# check for __read_mostly with const non-pointer (should just be const)
+		if ($line =~ /\b__read_mostly\b/ &&
+		    $line =~ /($Type)\s*$Ident/ && $1 !~ /\*\s*$/ && $1 =~ /\bconst\b/) {
+			if (ERROR("CONST_READ_MOSTLY",
+				  "Invalid use of __read_mostly with const type\n" . $herecurr) &&
+			    $fix) {
+				$fixed[$fixlinenr] =~ s/\s+__read_mostly\b//;
+			}
+		}
+
 # don't use __constant_<foo> functions outside of include/uapi/
 		if ($realfile !~ m@^include/uapi/@ &&
 		    $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {