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Commit 0ab90191 authored by Joe Perches's avatar Joe Perches Committed by Linus Torvalds
Browse files

checkpatch: add --strict preference for #defines using BIT(foo) 



Using BIT(foo) and BIT_ULL(bar) is more common now.  Suggest using these
macros over #defines with 1<<value.

Add a --fix option too.

Signed-off-by: default avatarJoe Perches <joe@perches.com>
Cc: David Miller <davem@davemloft.net>
Cc: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f5123576

scripts/checkpatch.pl

+11 −0
Original line number Diff line number Diff line
@@ -4975,6 +4975,17 @@ sub process { 
			}

		}



# check for #defines like: 1 << <digit> that could be BIT(digit)

		if ($line =~ /#\s*define\s+\w+\s+\(?\s*1\s*([ulUL]*)\s*\<\<\s*(?:\d+|$Ident)\s*\)?/) {

			my $ull = "";

			$ull = "_ULL" if (defined($1) && $1 =~ /ll/i);

			if (CHK("BIT_MACRO",

				"Prefer using the BIT$ull macro\n" . $herecurr) &&

			    $fix) {

				$fixed[$fixlinenr] =~ s/\(?\s*1\s*[ulUL]*\s*<<\s*(\d+|$Ident)\s*\)?/BIT${ull}($1)/;

			}

		}



# check for case / default statements not preceded by break/fallthrough/switch

		if ($line =~ /^.\s*(?:case\s+(?:$Ident|$Constant)\s*|default):/) {

			my $has_break = 0;