[PATCH 11/37] modpost: track if the symbol origin is a dump file or ELF object

Masahiro Yamada
2020-06-01T05:58:21Z

The meaning of sym->kernel is obscure; it is set for in-kernel symbols
loaded from Modules.symver. This happens only when we are building
external modules, and it is used to determine whether to dump symbols
to $(KBUILD_EXTMOD)/Modules.symver

It is clearer to remember whether the symbol or module came from a dump
file or ELF object.

This changes the KBUILD_EXTRA_SYMBOLS behavior. Previously, symbols
loaded from KBUILD_EXTRA_SYMBOLS are accumulated into the current
$(KBUILD_EXTMOD)/Modules.symver

Going forward, they will be only used to check symbol references, but
not dumped into the current $(KBUILD_EXTMOD)/Modules.symver. I believe
this makes more sense.

sym->vmlinux will have no user. Remove it too.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
---

scripts/mod/modpost.c | 15 +++++----------
scripts/mod/modpost.h | 1 +
2 files changed, 6 insertions(+), 10 deletions(-)

diff --git a/scripts/mod/modpost.c b/scripts/mod/modpost.c
index 5224a02edbf2..60f35b89cea2 100644
--- a/scripts/mod/modpost.c
+++ b/scripts/mod/modpost.c
@@ -161,9 +161,6 @@ struct symbol {
int crc_valid;
char *namespace;
unsigned int weak:1;
- unsigned int vmlinux:1; /* 1 if symbol is defined in vmlinux */
- unsigned int kernel:1; /* 1 if symbol is from kernel
- * (only for external modules) **/
unsigned int is_static:1; /* 1 if symbol is not global */
enum export export; /* Type of export */
char name[];
@@ -398,8 +395,6 @@ static struct symbol *sym_add_exported(const char *name, struct module *mod,
}

s->module = mod;
- s->vmlinux = is_vmlinux(mod->name);
- s->kernel = 0;
s->export = export;
return s;
}
@@ -2427,7 +2422,7 @@ static void write_if_changed(struct buffer *b, const char *fname)
/* parse Module.symvers file. line format:
* 0x12345678<tab>symbol<tab>module<tab>export<tab>namespace
**/
-static void read_dump(const char *fname, unsigned int kernel)
+static void read_dump(const char *fname)
{
unsigned long size, pos = 0;
void *file = grab_file(fname, &size);
@@ -2465,9 +2460,9 @@ static void read_dump(const char *fname, unsigned int kernel)
have_vmlinux = 1;
mod = new_module(modname);
mod->skip = 1;
+ mod->from_dump = 1;
}
s = sym_add_exported(symname, mod, export_no(export));
- s->kernel = kernel;
s->is_static = 0;
sym_set_crc(symname, crc);
sym_update_namespace(symname, namespace);
@@ -2487,7 +2482,7 @@ static int dump_sym(struct symbol *sym)
{
if (!external_module)
return 1;
- if (sym->vmlinux || sym->kernel)
+ if (sym->module->from_dump)
return 0;
return 1;
}
@@ -2606,11 +2601,11 @@ int main(int argc, char **argv)
}

if (kernel_read)
- read_dump(kernel_read, 1);
+ read_dump(kernel_read);
while (extsym_start) {
struct ext_sym_list *tmp;

- read_dump(extsym_start->file, 0);
+ read_dump(extsym_start->file);
tmp = extsym_start->next;
free(extsym_start);
extsym_start = tmp;
diff --git a/scripts/mod/modpost.h b/scripts/mod/modpost.h
index 39f6c29fb568..b8b7a82d2ff7 100644
--- a/scripts/mod/modpost.h
+++ b/scripts/mod/modpost.h
@@ -119,6 +119,7 @@ struct module {
const char *name;
int gpl_compatible;
struct symbol *unres;
+ int from_dump; /* 1 if module was loaded from *.symver */
int seen;
int skip;
int has_init;
--
2.25.1