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Merge tag 'kbuild-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild

Browse Source 
Pull Kbuild updates from Masahiro Yamada:

 - improve fixdep to coalesce consecutive slashes in dep-files

 - fix some issues of the maintainer string generation in deb-pkg script

 - remove unused CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX and clean-up
   several tools and linker scripts

 - clean-up modpost

 - allow to enable the dead code/data elimination for PowerPC in EXPERT
   mode

 - improve two coccinelle scripts for better performance

 - pass endianness and machine size flags to sparse for all architecture

 - misc fixes

* tag 'kbuild-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (25 commits)
  kbuild: add machine size to CHECKFLAGS
  kbuild: add endianness flag to CHEKCFLAGS
  kbuild: $(CHECK) doesnt need NOSTDINC_FLAGS twice
  scripts: Fixed printf format mismatch
  scripts/tags.sh: use `find` for $ALLSOURCE_ARCHS generation
  coccinelle: deref_null: improve performance
  coccinelle: mini_lock: improve performance
  powerpc: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selected
  kbuild: Allow LD_DEAD_CODE_DATA_ELIMINATION to be selectable if enabled
  kbuild: LD_DEAD_CODE_DATA_ELIMINATION no -ffunction-sections/-fdata-sections for module build
  kbuild: Fix asm-generic/vmlinux.lds.h for LD_DEAD_CODE_DATA_ELIMINATION
  modpost: constify *modname function argument where possible
  modpost: remove redundant is_vmlinux() test
  modpost: use strstarts() helper more widely
  modpost: pass struct elf_info pointer to get_modinfo()
  checkpatch: remove VMLINUX_SYMBOL() check
  vmlinux.lds.h: remove no-op macro VMLINUX_SYMBOL()
  kbuild: remove CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
  export.h: remove code for prefixing symbols with underscore
  depmod.sh: remove symbol prefix support
  ...
This commit is contained in:
Linus Torvalds
2018-06-06 11:00:15 -07:00
parent 126f7051b4 1f2f01b122
commit 8715ee75fe
33 changed files with 349 additions and 443 deletions
Download Patch File Download Diff File Expand all files Collapse all files

97
scripts/mod/modpost.c
View File

@@ -19,9 +19,7 @@
#include <stdbool.h>
#include <errno.h>
#include "modpost.h"
#include "../../include/generated/autoconf.h"
#include "../../include/linux/license.h"
#include "../../include/linux/export.h"
/* Are we using CONFIG_MODVERSIONS? */
static int modversions = 0;
@@ -123,7 +121,7 @@ void *do_nofail(void *ptr, const char *expr)
/* A list of all modules we processed */
static struct module *modules;
static struct module *find_module(char *modname)
static struct module *find_module(const char *modname)
{
struct module *mod;
@@ -591,35 +589,32 @@ static void parse_elf_finish(struct elf_info *info)
static int ignore_undef_symbol(struct elf_info *info, const char *symname)
{
/* ignore __this_module, it will be resolved shortly */
if (strcmp(symname, VMLINUX_SYMBOL_STR(__this_module)) == 0)
if (strcmp(symname, "__this_module") == 0)
return 1;
/* ignore global offset table */
if (strcmp(symname, "_GLOBAL_OFFSET_TABLE_") == 0)
return 1;
if (info->hdr->e_machine == EM_PPC)
/* Special register function linked on all modules during final link of .ko */
if (strncmp(symname, "_restgpr_", sizeof("_restgpr_") - 1) == 0 ||
strncmp(symname, "_savegpr_", sizeof("_savegpr_") - 1) == 0 ||
strncmp(symname, "_rest32gpr_", sizeof("_rest32gpr_") - 1) == 0 ||
strncmp(symname, "_save32gpr_", sizeof("_save32gpr_") - 1) == 0 ||
strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0)
if (strstarts(symname, "_restgpr_") ||
strstarts(symname, "_savegpr_") ||
strstarts(symname, "_rest32gpr_") ||
strstarts(symname, "_save32gpr_") ||
strstarts(symname, "_restvr_") ||
strstarts(symname, "_savevr_"))
return 1;
if (info->hdr->e_machine == EM_PPC64)
/* Special register function linked on all modules during final link of .ko */
if (strncmp(symname, "_restgpr0_", sizeof("_restgpr0_") - 1) == 0 ||
strncmp(symname, "_savegpr0_", sizeof("_savegpr0_") - 1) == 0 ||
strncmp(symname, "_restvr_", sizeof("_restvr_") - 1) == 0 ||
strncmp(symname, "_savevr_", sizeof("_savevr_") - 1) == 0 ||
if (strstarts(symname, "_restgpr0_") ||
strstarts(symname, "_savegpr0_") ||
strstarts(symname, "_restvr_") ||
strstarts(symname, "_savevr_") ||
strcmp(symname, ".TOC.") == 0)
return 1;
/* Do not ignore this symbol */
return 0;
}
#define CRC_PFX VMLINUX_SYMBOL_STR(__crc_)
#define KSYMTAB_PFX VMLINUX_SYMBOL_STR(__ksymtab_)
static void handle_modversions(struct module *mod, struct elf_info *info,
Elf_Sym *sym, const char *symname)
{
@@ -628,13 +623,13 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
bool is_crc = false;
if ((!is_vmlinux(mod->name) || mod->is_dot_o) &&
strncmp(symname, "__ksymtab", 9) == 0)
strstarts(symname, "__ksymtab"))
export = export_from_secname(info, get_secindex(info, sym));
else
export = export_from_sec(info, get_secindex(info, sym));
/* CRC'd symbol */
if (strncmp(symname, CRC_PFX, strlen(CRC_PFX)) == 0) {
if (strstarts(symname, "__crc_")) {
is_crc = true;
crc = (unsigned int) sym->st_value;
if (sym->st_shndx != SHN_UNDEF && sym->st_shndx != SHN_ABS) {
@@ -647,13 +642,13 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
info->sechdrs[sym->st_shndx].sh_addr : 0);
crc = *crcp;
}
sym_update_crc(symname + strlen(CRC_PFX), mod, crc,
sym_update_crc(symname + strlen("__crc_"), mod, crc,
export);
}
switch (sym->st_shndx) {
case SHN_COMMON:
if (!strncmp(symname, "__gnu_lto_", sizeof("__gnu_lto_")-1)) {
if (strstarts(symname, "__gnu_lto_")) {
/* Should warn here, but modpost runs before the linker */
} else
warn("\"%s\" [%s] is COMMON symbol\n", symname, mod->name);
@@ -685,15 +680,10 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
}
#endif
#ifdef CONFIG_HAVE_UNDERSCORE_SYMBOL_PREFIX
if (symname[0] != '_')
break;
else
symname++;
#endif
if (is_crc) {
const char *e = is_vmlinux(mod->name) ?"":".ko";
warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n", symname + strlen(CRC_PFX), mod->name, e);
warn("EXPORT symbol \"%s\" [%s%s] version generation failed, symbol will not be versioned.\n",
symname + strlen("__crc_"), mod->name, e);
}
mod->unres = alloc_symbol(symname,
ELF_ST_BIND(sym->st_info) == STB_WEAK,
@@ -701,13 +691,13 @@ static void handle_modversions(struct module *mod, struct elf_info *info,
break;
default:
/* All exported symbols */
if (strncmp(symname, KSYMTAB_PFX, strlen(KSYMTAB_PFX)) == 0) {
sym_add_exported(symname + strlen(KSYMTAB_PFX), mod,
if (strstarts(symname, "__ksymtab_")) {
sym_add_exported(symname + strlen("__ksymtab_"), mod,
export);
}
if (strcmp(symname, VMLINUX_SYMBOL_STR(init_module)) == 0)
if (strcmp(symname, "init_module") == 0)
mod->has_init = 1;
if (strcmp(symname, VMLINUX_SYMBOL_STR(cleanup_module)) == 0)
if (strcmp(symname, "cleanup_module") == 0)
mod->has_cleanup = 1;
break;
}
@@ -734,16 +724,17 @@ static char *next_string(char *string, unsigned long *secsize)
return string;
}
static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
const char *tag, char *info)
static char *get_next_modinfo(struct elf_info *info, const char *tag,
char *prev)
{
char *p;
unsigned int taglen = strlen(tag);
unsigned long size = modinfo_len;
char *modinfo = info->modinfo;
unsigned long size = info->modinfo_len;
if (info) {
size -= info - (char *)modinfo;
modinfo = next_string(info, &size);
if (prev) {
size -= prev - modinfo;
modinfo = next_string(prev, &size);
}
for (p = modinfo; p; p = next_string(p, &size)) {
@@ -753,11 +744,10 @@ static char *get_next_modinfo(void *modinfo, unsigned long modinfo_len,
return NULL;
}
static char *get_modinfo(void *modinfo, unsigned long modinfo_len,
const char *tag)
static char *get_modinfo(struct elf_info *info, const char *tag)
{
return get_next_modinfo(modinfo, modinfo_len, tag, NULL);
return get_next_modinfo(info, tag, NULL);
}
/**
@@ -1181,13 +1171,13 @@ static int secref_whitelist(const struct sectioncheck *mismatch,
/* Check for pattern 1 */
if (match(tosec, init_data_sections) &&
match(fromsec, data_sections) &&
(strncmp(fromsym, "__param", strlen("__param")) == 0))
strstarts(fromsym, "__param"))
return 0;
/* Check for pattern 1a */
if (strcmp(tosec, ".init.text") == 0 &&
match(fromsec, data_sections) &&
(strncmp(fromsym, "__param_ops_", strlen("__param_ops_")) == 0))
strstarts(fromsym, "__param_ops_"))
return 0;
/* Check for pattern 2 */
@@ -1542,8 +1532,7 @@ static void default_mismatch_handler(const char *modname, struct elf_info *elf,
from = find_elf_symbol2(elf, r->r_offset, fromsec);
fromsym = sym_name(elf, from);
if (!strncmp(fromsym, "reference___initcall",
sizeof("reference___initcall")-1))
if (strstarts(fromsym, "reference___initcall"))
return;
tosec = sec_name(elf, get_secindex(elf, sym));
@@ -1940,7 +1929,7 @@ static char *remove_dot(char *s)
return s;
}
static void read_symbols(char *modname)
static void read_symbols(const char *modname)
{
const char *symname;
char *version;
@@ -1961,7 +1950,7 @@ static void read_symbols(char *modname)
mod->skip = 1;
}
license = get_modinfo(info.modinfo, info.modinfo_len, "license");
license = get_modinfo(&info, "license");
if (!license && !is_vmlinux(modname))
warn("modpost: missing MODULE_LICENSE() in %s\n"
"see include/linux/module.h for "
@@ -1973,8 +1962,7 @@ static void read_symbols(char *modname)
mod->gpl_compatible = 0;
break;
}
license = get_next_modinfo(info.modinfo, info.modinfo_len,
"license", license);
license = get_next_modinfo(&info, "license", license);
}
for (sym = info.symtab_start; sym < info.symtab_stop; sym++) {
@@ -1983,11 +1971,10 @@ static void read_symbols(char *modname)
handle_modversions(mod, &info, sym, symname);
handle_moddevtable(mod, &info, sym, symname);
}
if (!is_vmlinux(modname) ||
(is_vmlinux(modname) && vmlinux_section_warnings))
if (!is_vmlinux(modname) || vmlinux_section_warnings)
check_sec_ref(mod, modname, &info);
version = get_modinfo(info.modinfo, info.modinfo_len, "version");
version = get_modinfo(&info, "version");
if (version)
maybe_frob_rcs_version(modname, version, info.modinfo,
version - (char *)info.hdr);
@@ -2174,9 +2161,7 @@ static void add_retpoline(struct buffer *b)
static void add_staging_flag(struct buffer *b, const char *name)
{
static const char *staging_dir = "drivers/staging";
if (strncmp(staging_dir, name, strlen(staging_dir)) == 0)
if (strstarts(name, "drivers/staging"))
buf_printf(b, "\nMODULE_INFO(staging, \"Y\");\n");
}
@@ -2230,7 +2215,7 @@ static int add_versions(struct buffer *b, struct module *mod)
err = 1;
break;
}
buf_printf(b, "\t{ %#8x, __VMLINUX_SYMBOL_STR(%s) },\n",
buf_printf(b, "\t{ %#8x, \"%s\" },\n",
s->crc, s->name);
}