Re: [PATCH 2/2] modpost: file2alias: check prototype of handler

From: Mathieu Malaterre
Date: Mon Nov 26 2018 - 05:41:11 EST


On Thu, Nov 22, 2018 at 5:29 AM Masahiro Yamada
<yamada.masahiro@xxxxxxxxxxxxx> wrote:
>
> Use specific prototype instead of an opaque pointer so that the
> compiler can catch incompatible pointer type.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> ---
>
> scripts/mod/file2alias.c | 7 +++----
> 1 file changed, 3 insertions(+), 4 deletions(-)
>
> diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
> index 7e4aede..a37af7d 100644
> --- a/scripts/mod/file2alias.c
> +++ b/scripts/mod/file2alias.c
> @@ -47,7 +47,7 @@ typedef struct {
> struct devtable {
> const char *device_id; /* name of table, __mod_<name>__*_device_table. */
> unsigned long id_size;
> - void *function;
> + int (*do_entry)(const char *filename, void *symval, char *alias);
> };

It makes sense to do this cleanup.

Reviewed-by: Mathieu Malaterre <malat@xxxxxxxxxx>


> /* Define a variable f that holds the value of field f of struct devid
> @@ -1299,12 +1299,11 @@ static bool sym_is(const char *name, unsigned namelen, const char *symbol)
> static void do_table(void *symval, unsigned long size,
> unsigned long id_size,
> const char *device_id,
> - void *function,
> + int (*do_entry)(const char *filename, void *symval, char *alias),
> struct module *mod)
> {
> unsigned int i;
> char alias[500];
> - int (*do_entry)(const char *, void *entry, char *alias) = function;
>
> device_id_check(mod->name, device_id, size, id_size, symval);
> /* Leave last one: it's the terminator. */
> @@ -1420,7 +1419,7 @@ void handle_moddevtable(struct module *mod, struct elf_info *info,
>
> if (sym_is(name, namelen, p->device_id)) {
> do_table(symval, sym->st_size, p->id_size,
> - p->device_id, p->function, mod);
> + p->device_id, p->do_entry, mod);
> break;
> }
> }
> --
> 2.7.4
>