[Acked] [PATCH] checkpatch: Warn on embedded function names

[Andy Whitcroft <apw@canonical.com>]

On Tue, Jan 03, 2017 at 07:21:54PM -0800, Joe Perches wrote:
> Embedded function names are less appropriate to use when
> refactoring can cause function renaming.  Prefer the use
> of "%s", __func__ to embedded function names.
> 
> Signed-off-by: Joe Perches <joe@perches.com>
> ---
>  scripts/checkpatch.pl | 22 ++++++++++++++++++++--
>  1 file changed, 20 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/checkpatch.pl b/scripts/checkpatch.pl
> index 982c52ca6473..4f53093a1b0b 100755
> --- a/scripts/checkpatch.pl
> +++ b/scripts/checkpatch.pl
> @@ -2134,7 +2134,7 @@ sub process {
>  	my $in_header_lines = $file ? 0 : 1;
>  	my $in_commit_log = 0;		#Scanning lines before patch
>  	my $has_commit_log = 0;		#Encountered lines before patch
> -       my $commit_log_possible_stack_dump = 0;
> +	my $commit_log_possible_stack_dump = 0;
>  	my $commit_log_long_line = 0;
>  	my $commit_log_has_diff = 0;
>  	my $reported_maintainer_file = 0;
> @@ -2154,6 +2154,7 @@ sub process {
>  	my $realline = 0;
>  	my $realcnt = 0;
>  	my $here = '';
> +	my $context_function;		#undef'd unless there's a known function
>  	my $in_comment = 0;
>  	my $comment_edge = 0;
>  	my $first_line = 0;
> @@ -2192,7 +2193,8 @@ sub process {
>  			}
>  			#next;
>  		}
> -		if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@/) {
> +		if ($rawline=~/^\@\@ -\d+(?:,\d+)? \+(\d+)(,(\d+))? \@\@(.*)/) {
> +			my $context = $4;
>  			$realline=$1-1;
>  			if (defined $2) {
>  				$realcnt=$3+1;
> @@ -2201,6 +2203,12 @@ sub process {
>  			}
>  			$in_comment = 0;
>  
> +			if ($context =~ /\b(\w+)\s*\(/) {
> +				$context_function = $1;
> +			} else {
> +				undef $context_function;
> +			}
> +
>  			# Guestimate if this is a continuing comment.  Run
>  			# the context looking for a comment "edge".  If this
>  			# edge is a close comment then we must be in a comment
> @@ -5157,6 +5165,16 @@ sub process {
>  			     "break quoted strings at a space character\n" . $hereprev);
>  		}
>  
> +#check for an embedded function name in a string when the function is known
> +# as part of a diff.  This does not work for -f --file checking as it
> +#depends on patch context providing the function name
> +		if ($line =~ /^\+.*$String/ &&
> +		    defined($context_function) &&
> +		    get_quoted_string($line, $rawline) =~ /\b$context_function\b/) {
> +			WARN("EMBEDDED_FUNCTION_NAME",
> +			     "Prefer using \"%s\", __func__ to embedded function names\n" . $herecurr);
> +		}
> +
>  # check for spaces before a quoted newline
>  		if ($rawline =~ /^.*\".*\s\\n/) {
>  			if (WARN("QUOTED_WHITESPACE_BEFORE_NEWLINE",
> -- 
> 2.10.0.rc2.1.g053435c
> 

Looks sane enough to me.

Acked-by: Andy Whitcroft <apw@canonical.com>

-apw