(+CC: Matthias, who might be interested)
On Fri, Nov 15, 2019 at 2:42 AM Masahiro Yamada
<yamada.masahiro@xxxxxxxxxxxxx> wrote:
>
> Currently, namespace_from_kstrtabns() relies on the fact that
> namespace strings are recorded in the __ksymtab_strings section.
> Actually, it is coded in include/linux/export.h, but modpost does
> not need to hard-code the section name.
>
> Elf_Sym::st_shndx holds the section number of the relevant section.
> Using it is a more portable way to find the namespace string.
>
> sym_get_value() takes care of it, so namespace_from_kstrtabns() can
> simply wrap it. Delete the unneeded info->ksymtab_strings .
>
> While I was here, I added more 'const' qualifiers to pointers.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
> ---
>
> scripts/mod/modpost.c | 10 +++-------
> scripts/mod/modpost.h | 1 -
> 2 files changed, 3 insertions(+), 8 deletions(-)
>
> diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
> index cd885573daaf..d9418c58a8c0 100644
> --- a/scripts/mod/modpost.c
> +++ b/scripts/mod/modpost.c
> @@ -356,10 +356,10 @@ static enum export export_from_sec(struct elf_info *elf, unsigned int sec)
> return export_unknown;
> }
>
> -static const char *namespace_from_kstrtabns(struct elf_info *info,
> - Elf_Sym *kstrtabns)
> +static const char *namespace_from_kstrtabns(const struct elf_info *info,
> + const Elf_Sym *sym)
> {
> - char *value = info->ksymtab_strings + kstrtabns->st_value;
> + const char *value = sym_get_data(info, sym);
> return value[0] ? value : NULL;
> }
>
> @@ -601,10 +601,6 @@ static int parse_elf(struct elf_info *info, const char *filename)
> info->export_unused_gpl_sec = i;
> else if (strcmp(secname, "__ksymtab_gpl_future") == 0)
> info->export_gpl_future_sec = i;
> - else if (strcmp(secname, "__ksymtab_strings") == 0)
> - info->ksymtab_strings = (void *)hdr +
> - sechdrs[i].sh_offset -
> - sechdrs[i].sh_addr;
>
> if (sechdrs[i].sh_type == SHT_SYMTAB) {
> unsigned int sh_link_idx;
> diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
> index fe6652535e4b..64a82d2d85f6 100644
> --- a/scripts/mod/modpost.h
> +++ b/scripts/mod/modpost.h
> @@ -143,7 +143,6 @@ struct elf_info {
> Elf_Section export_gpl_sec;
> Elf_Section export_unused_gpl_sec;
> Elf_Section export_gpl_future_sec;
> - char *ksymtab_strings;
> char *strtab;
> char *modinfo;
> unsigned int modinfo_len;
> --
> 2.17.1
>
--
Best Regards
Masahiro Yamada
