| Message ID | 20191114174226.7201-2-yamada.masahiro@socionext.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/6] modpost: add a helper to get data pointed by a symbol | expand |
(+CC: Matthias, who might be interested) On Fri, Nov 15, 2019 at 2:42 AM Masahiro Yamada <yamada.masahiro@socionext.com> 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@socionext.com> > --- > > 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 >
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;
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@socionext.com> --- scripts/mod/modpost.c | 10 +++------- scripts/mod/modpost.h | 1 - 2 files changed, 3 insertions(+), 8 deletions(-)