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checkpatch: prefer static const declarations 

There are about 100,000 uses of 'static const <type>' but about 400 uses
of 'static <type> const' in the kernel where type is not a pointer.

The kernel almost always uses "static const" over "const static" as there
is a compiler warning for that declaration style.

But there is no compiler warning for "static <type> const".

So add a checkpatch warning for the atypical declaration uses of.

	const static <type> <foo>
and
	static <type> const <foo>

For example:

  $ ./scripts/checkpatch.pl -f --emacs --quiet --nosummary -types=static_const arch/arm/crypto/aes-ce-glue.c
  arch/arm/crypto/aes-ce-glue.c:75: WARNING: Move const after static - use 'static const u8'
  #75: FILE: arch/arm/crypto/aes-ce-glue.c:75:
  +	static u8 const rcon[] = {

Link: https://lkml.kernel.org/r/4b863be68e679546b40d50b97a4a806c03056a1c.camel@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
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 2020-12-15 20:44:30 -08:00 committed by Linus Torvalds
parent 4104a20646
commit 73169765e6
1 changed files with 12 additions and 0 deletions
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12
scripts/checkpatch.pl
View File

@ -4232,6 +4232,18 @@ sub process {
}
}
# check for const static or static <non ptr type> const declarations
# prefer 'static const <foo>' over 'const static <foo>' and 'static <foo> const'
if ($sline =~ /^\+\s*const\s+static\s+($Type)\b/ ||
$sline =~ /^\+\s*static\s+($BasicType)\s+const\b/) {
if (WARN("STATIC_CONST",
"Move const after static - use 'static const $1'\n" . $herecurr) &&
$fix) {
$fixed[$fixlinenr] =~ s/\bconst\s+static\b/static const/;
$fixed[$fixlinenr] =~ s/\bstatic\s+($BasicType)\s+const\b/static const $1/;
}
}
# check for non-global char *foo[] = {"bar", ...} declarations.
if ($line =~ /^.\s+(?:static\s+|const\s+)?char\s+\*\s*\w+\s*\[\s*\]\s*=\s*\{/) {
WARN("STATIC_CONST_CHAR_ARRAY",