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SubjectRe: [PATCH] scripts/kernel-doc: Add support for named variable macro arguments
On Thu, Nov 07, 2019 at 02:41:33PM +0100, Jonathan Neuschäfer wrote:
> Currently, when kernel-doc encounters a macro with a named variable
> argument[1], such as this:
>
> #define hlist_for_each_entry_rcu(pos, head, member, cond...)
>
> ... it expects the variable argument to be documented as `cond...`,
> rather than `cond`. This is semantically wrong, because the name (as
> used in the macro body) is actually `cond`.
>
> With this patch, kernel-doc will accept the name without dots (`cond`
> in the example above) in doc comments, and warn if the name with dots
> (`cond...`) is used and verbose mode[2] is enabled.
>
> The support for the `cond...` syntax can be removed later, when the
> documentation of all such macros has been switched to the new syntax.
>
> Testing this patch on top of v5.4-rc6, `make htmldocs` shows a few
> changes in log output and HTML output:
>
> 1) The following warnings[3] are eliminated:
>
> ./include/linux/rculist.h:374: warning:
> Excess function parameter 'cond' description in 'list_for_each_entry_rcu'
> ./include/linux/rculist.h:651: warning:
> Excess function parameter 'cond' description in 'hlist_for_each_entry_rcu'
>
> 2) For list_for_each_entry_rcu and hlist_for_each_entry_rcu, the
> correct description is shown
>
> 3) Named variable arguments are shown without dots
>
>
> [1]: https://gcc.gnu.org/onlinedocs/cpp/Variadic-Macros.html
> [2]: scripts/kernel-doc -v
> [3]: See also https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?h=dev&id=5bc4bc0d6153617eabde275285b7b5a8137fdf3c
>
> Signed-off-by: Jonathan Neuschäfer <j.neuschaefer@gmx.net>
> Cc: Paul E. McKenney <paulmck@kernel.org>

Tested-by: Paul E. McKenney <paulmck@kernel.org>

> ---
> scripts/kernel-doc | 16 ++++++++++++++++
> 1 file changed, 16 insertions(+)
>
> diff --git a/scripts/kernel-doc b/scripts/kernel-doc
> index 81dc91760b23..48696391eccb 100755
> --- a/scripts/kernel-doc
> +++ b/scripts/kernel-doc
> @@ -1449,6 +1449,10 @@ sub push_parameter($$$$) {
> # handles unnamed variable parameters
> $param = "...";
> }
> + elsif ($param =~ /\w\.\.\.$/) {
> + # for named variable parameters of the form `x...`, remove the dots
> + $param =~ s/\.\.\.$//;
> + }
> if (!defined $parameterdescs{$param} || $parameterdescs{$param} eq "") {
> $parameterdescs{$param} = "variable arguments";
> }
> @@ -1936,6 +1940,18 @@ sub process_name($$) {
> sub process_body($$) {
> my $file = shift;
>
> + # Until all named variable macro parameters are
> + # documented using the bare name (`x`) rather than with
> + # dots (`x...`), strip the dots:
> + if ($section =~ /\w\.\.\.$/) {
> + $section =~ s/\.\.\.$//;
> +
> + if ($verbose) {
> + print STDERR "${file}:$.: warning: Variable macro arguments should be documented without dots\n";
> + ++$warnings;
> + }
> + }
> +
> if (/$doc_sect/i) { # case insensitive for supported section names
> $newsection = $1;
> $newcontents = $2;
> --
> 2.20.1
>

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