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| author | Joe Perches <joe@perches.com> | 2016-10-11 13:52:11 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-10-11 15:06:30 -0700 |
| commit | 9192d41a3f0b98844860f1de5b82f729bbe07c61 (patch) | |
| tree | 5e8f6680b5b5d6b577cd15ee9d07773825584d30 /scripts | |
| parent | f59b64bffe163431b4ec61f3b00c1aeb846948f3 (diff) | |
| download | lwn-9192d41a3f0b98844860f1de5b82f729bbe07c61.tar.gz lwn-9192d41a3f0b98844860f1de5b82f729bbe07c61.zip | |
checkpatch: add --strict test for precedence challenged macro arguments
Add a test for macro arguents that have a non-comma leading or trailing
operator where the argument isn't parenthesized to avoid possible precedence
issues.
Link: http://lkml.kernel.org/r/47715508972f8d786f435e583ff881dbeee3a114.1473745855.git.joe@perches.com
Signed-off-by: Joe Perches <joe@perches.com>
Cc: Andy Whitcroft <apw@canonical.com>
Cc: Julia Lawall <julia.lawall@lip6.fr>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts')
| -rwxr-xr-x | scripts/checkpatch.pl | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl index f135f8e4d069..ea1a7adce406 100755 --- a/scripts/checkpatch.pl +++ b/scripts/checkpatch.pl @@ -4836,7 +4836,7 @@ sub process { # check if any macro arguments are reused (ignore '...' and 'type') foreach my $arg (@def_args) { next if ($arg =~ /\.\.\./); - next if ($arg =~ /^type$/); + next if ($arg =~ /^type$/i); my $tmp = $define_stmt; $tmp =~ s/\b(typeof|__typeof__|__builtin\w+|typecheck\s*\(\s*$Type\s*,|\#+)\s*\(*\s*$arg\s*\)*\b//g; $tmp =~ s/\#\s*$arg\b//g; @@ -4845,6 +4845,13 @@ sub process { if ($use_cnt > 1) { CHK("MACRO_ARG_REUSE", "Macro argument reuse '$arg' - possible side-effects?\n" . "$herectx"); + } +# check if any macro arguments may have other precedence issues + if ($define_stmt =~ m/($Operators)?\s*\b$arg\b\s*($Operators)?/m && + ((defined($1) && $1 ne ',') || + (defined($2) && $2 ne ','))) { + CHK("MACRO_ARG_PRECEDENCE", + "Macro argument '$arg' may be better as '($arg)' to avoid precedence issues\n" . "$herectx"); } } |