linux-kernel - Re: [PATCH v7 3/5] modpost: Add -b option for emitting built-in aliases

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Date:   Sat, 17 Dec 2022 10:10:24 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Allen Webb <allenwebb@...gle.com>,
        "linux-modules@...r.kernel.org" <linux-modules@...r.kernel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Luis Chamberlain <mcgrof@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v7 3/5] modpost: Add -b option for emitting built-in
 aliases



Le 16/12/2022 à 23:17, Allen Webb a écrit :
> This adds an unimplemented command line flag for writing the built-in
> aliases to a file.
> 
> Signed-off-by: Allen Webb <allenwebb@...gle.com>
> ---
>   scripts/mod/modpost.c | 23 +++++++++++++++++++++--
>   scripts/mod/modpost.h |  1 +
>   2 files changed, 22 insertions(+), 2 deletions(-)
> 
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 2c80da0220c32..845f157d69ebc 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -2165,6 +2165,19 @@ static void write_if_changed(struct buffer *b, const char *fname)
>   	write_buf(b, fname);
>   }
>   
> +/* Write the builtin aliases to the specified file. */
> +static void write_builtin(const char *fname)
> +{
> +	struct buffer buf = { };
> +	struct module *mod;
> +
> +	list_for_each_entry(mod, &modules, list) {

No { } for single line statements, see 
https://docs.kernel.org/process/coding-style.html#placing-braces-and-spaces

> +		buf_write(&buf, mod->modalias_buf.p, mod->modalias_buf.pos);
> +	}
> +	write_if_changed(&buf, fname);
> +	free(buf.p);
> +}
> +
>   static void write_vmlinux_export_c_file(struct module *mod)
>   {
>   	struct buffer buf = { };
> @@ -2321,13 +2334,16 @@ int main(int argc, char **argv)
>   {
>   	struct module *mod;
>   	char *missing_namespace_deps = NULL;
> -	char *dump_write = NULL, *files_source = NULL;
> +	char *builtin_write = NULL, *dump_write = NULL, *files_source = NULL;
>   	int opt;
>   	LIST_HEAD(dump_lists);
>   	struct dump_list *dl, *dl2;
>   
> -	while ((opt = getopt(argc, argv, "ei:mnT:o:awENd:")) != -1) {
> +	while ((opt = getopt(argc, argv, "b:ei:mnT:o:awENd:")) != -1) {
>   		switch (opt) {
> +		case 'b':
> +			builtin_write = optarg;
> +			break;
>   		case 'e':
>   			external_module = true;
>   			break;
> @@ -2390,6 +2406,9 @@ int main(int argc, char **argv)
>   			write_mod_c_file(mod);
>   	}
>   
> +	if (builtin_write)
> +		write_builtin(builtin_write);
> +
>   	if (missing_namespace_deps)
>   		write_namespace_deps_files(missing_namespace_deps);
>   
> diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
> index 34fe5fc0b02cb..c55a6aeb46bfd 100644
> --- a/scripts/mod/modpost.h
> +++ b/scripts/mod/modpost.h
> @@ -123,6 +123,7 @@ struct module {
>   	bool has_init;
>   	bool has_cleanup;
>   	struct buffer dev_table_buf;
> +	struct buffer modalias_buf;
>   	char	     srcversion[25];
>   	// Missing namespace dependencies
>   	struct list_head missing_namespaces;