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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>
This commit is contained in:
Joe Perches 2015-04-16 12:44:42 -07:00 committed by Linus Torvalds
parent d7fe8065ad
commit c17893c740
1 changed files with 10 additions and 0 deletions
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10
scripts/checkpatch.pl
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@ -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/ # don't use __constant_<foo> functions outside of include/uapi/
if ($realfile !~ m@^include/uapi/@ && if ($realfile !~ m@^include/uapi/@ &&
$line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) { $line =~ /(__constant_(?:htons|ntohs|[bl]e(?:16|32|64)_to_cpu|cpu_to_[bl]e(?:16|32|64)))\s*\(/) {