On Tue, Apr 5, 2022 at 4:34 AM Masahiro Yamada <masahiroy@xxxxxxxxxx> wrote:
>
> There are two call sites for sym_update_namespace().
>
> When the symbol has no namespace, s->namespace is set to NULL,
> but the conversion from "" to NULL is done in two different places.
>
> [1] read_symbols()
>
> This gets the namespace from __kstrtabns_<symbol>. If the symbol has
> no namespace, sym_get_data(info, sym) returns the empty string "".
> namespace_from_kstrtabns() converts it to NULL before it is passed to
> sym_update_namespace().
>
> [2] read_dump()
>
> This gets the namespace from the dump file, *.symvers. If the symbol
> has no namespace, the 'namespace' is the empty string "", which is
> directly passed into sym_update_namespace(). The conversion from
> "" to NULL is done in sym_update_namespace().
>
> namespace_from_kstrtabns() exists only for creating this inconsistency.
>
> By removing it, sym_update_namespace() is consistently passed with ""
> when the symbol has no namespace.
>
> Signed-off-by: Masahiro Yamada <masahiroy@xxxxxxxxxx>
Thanks for the patch!
Reviewed-by: Nick Desaulniers <ndesaulniers@xxxxxxxxxx>
> ---
>
> Changes in v2:
> - new
>
> scripts/mod/modpost.c | 14 ++------------
> 1 file changed, 2 insertions(+), 12 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index 2a202764ff48..522d5249d196 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -369,13 +369,6 @@ static enum export export_from_secname(struct elf_info *elf, unsigned int sec)
> return export_unknown;
> }
>
> -static const char *namespace_from_kstrtabns(const struct elf_info *info,
> - const Elf_Sym *sym)
> -{
> - const char *value = sym_get_data(info, sym);
> - return value[0] ? value : NULL;
> -}
> -
> static void sym_update_namespace(const char *symname, const char *namespace)
> {
> struct symbol *s = find_symbol(symname);
> @@ -391,8 +384,7 @@ static void sym_update_namespace(const char *symname, const char *namespace)
> }
>
> free(s->namespace);
> - s->namespace =
> - namespace && namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
> + s->namespace = namespace[0] ? NOFAIL(strdup(namespace)) : NULL;
> }
>
> /**
> @@ -2049,9 +2041,7 @@ static void read_symbols(const char *modname)
> /* Apply symbol namespaces from __kstrtabns_<symbol> entries. */
> if (strstarts(symname, "__kstrtabns_"))
> sym_update_namespace(symname + strlen("__kstrtabns_"),
> - namespace_from_kstrtabns(&info,
> - sym));
> -
> + sym_get_data(&info, sym));
> if (strstarts(symname, "__crc_"))
> handle_modversion(mod, &info, sym,
> symname + strlen("__crc_"));
> --
> 2.32.0
>
--
Thanks,
~Nick Desaulniers
