linux-kernel - Re: [PATCH 2/4] modpost: make updating the symbol namespace explict

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Message-ID: <CAK7LNAQ85JzqvMKmuqCsnL7KqtH_wosia=8XF6QVSf6sCanXnQ@mail.gmail.com>
Date:   Sat, 12 Oct 2019 12:22:20 +0900
From:   Masahiro Yamada <yamada.masahiro@...ionext.com>
To:     Matthias Maennich <maennich@...gle.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>,
        Jessica Yu <jeyu@...nel.org>,
        Martijn Coenen <maco@...roid.com>,
        Lucas De Marchi <lucas.de.marchi@...il.com>,
        Shaun Ruffell <sruffell@...ffell.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Will Deacon <will@...nel.org>,
        Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
        linux-modules <linux-modules@...r.kernel.org>
Subject: Re: [PATCH 2/4] modpost: make updating the symbol namespace explict

On Fri, Oct 11, 2019 at 12:16 AM Matthias Maennich <maennich@...gle.com> wrote:
>
> Setting the symbol namespace of a symbol within sym_add_exported feels
> displaced and lead to issues in the current implementation of symbol
> namespaces. This patch makes updating the namespace an explicit call to
> decouple it from adding a symbol to the export list.
>
> Signed-off-by: Matthias Maennich <maennich@...gle.com>
> ---


Reviewed-by: Masahiro Yamada <yamada.masahiro@...ionext.com>



>  scripts/mod/modpost.c | 12 ++++++------
>  1 file changed, 6 insertions(+), 6 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 9f5dcdff4d2f..46137b730447 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -382,8 +382,8 @@ static void sym_update_namespace(const char *symname, const char *namespace)
>   * Add an exported symbol - it may have already been added without a
>   * CRC, in this case just update the CRC
>   **/
> -static struct symbol *sym_add_exported(const char *name, const char *namespace,
> -                                      struct module *mod, enum export export)
> +static struct symbol *sym_add_exported(const char *name, struct module *mod,
> +                                      enum export export)
>  {
>         struct symbol *s = find_symbol(name);
>
> @@ -399,7 +399,6 @@ static struct symbol *sym_add_exported(const char *name, const char *namespace,
>                         s->module = mod;
>                 }
>         }
> -       sym_update_namespace(name, namespace);
>         s->preloaded = 0;
>         s->vmlinux   = is_vmlinux(mod->name);
>         s->kernel    = 0;
> @@ -761,7 +760,8 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
>                 if (strstarts(symname, "__ksymtab_")) {
>                         name = symname + strlen("__ksymtab_");
>                         namespace = sym_extract_namespace(&name);
> -                       sym_add_exported(name, namespace, mod, export);
> +                       sym_add_exported(name, mod, export);
> +                       sym_update_namespace(name, namespace);
>                         free(namespace);
>                 }
>                 if (strcmp(symname, "init_module") == 0)
> @@ -2469,12 +2469,12 @@ static void read_dump(const char *fname, unsigned int kernel)
>                         mod = new_module(modname);
>                         mod->skip = 1;
>                 }
> -               s = sym_add_exported(symname, namespace, mod,
> -                                    export_no(export));
> +               s = sym_add_exported(symname, mod, export_no(export));
>                 s->kernel    = kernel;
>                 s->preloaded = 1;
>                 s->is_static = 0;
>                 sym_update_crc(symname, mod, crc, export_no(export));
> +               sym_update_namespace(symname, namespace);
>         }
>         release_file(file, size);
>         return;
> --
> 2.23.0.581.g78d2f28ef7-goog
>


-- 
Best Regards
Masahiro Yamada