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authorJoe Perches <joe@perches.com>2014-12-10 15:51:57 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2014-12-10 17:41:12 -0800
commit0ab9019184f1de09409434204cb8fbffe8286e00 (patch)
treef1afe23858fb53702ee9a30f0fa2740e60efea25 /scripts/checkpatch.pl
parentf512357646268451da0d7e1e0100c55df6c8cea6 (diff)
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: Joe Perches <joe@perches.com> Cc: David Miller <davem@davemloft.net> Cc: Jiri Pirko <jiri@resnulli.us> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/checkpatch.pl')
-rwxr-xr-xscripts/checkpatch.pl11
1 files changed, 11 insertions, 0 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
index 518cc2e58439..d06b6be2841e 100755
--- a/scripts/checkpatch.pl
+++ b/scripts/checkpatch.pl
@@ -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;