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Commit 7a3ee753 authored by Mathias Krause's avatar Mathias Krause Committed by Rusty Russell
Browse files

modpost: reduce visibility of symbols and constify r/o arrays 



Internally used symbols of modpost don't need to be externally visible;
make them static. Also constify the string arrays so they resist in the
r/o section instead of being runtime writable.

Those changes lead to a small size reduction as can be seen below:

   text    data     bss     dec     hex filename
  51381    2640   12416   66437   10385 scripts/mod/modpost.old
  51765    2224   12416   66405   10365 scripts/mod/modpost.new

Signed-off-by: default avatarMathias Krause <minipli@googlemail.com>
Signed-off-by: default avatarRusty Russell <rusty@rustcorp.com.au>
parent 7a486d37

scripts/mod/modpost.c

+12 −11
Original line number Diff line number Diff line
@@ -24,9 +24,9 @@ 
#include "../../include/linux/export.h"



/* Are we using CONFIG_MODVERSIONS? */

int modversions = 0;

static int modversions = 0;

/* Warn about undefined symbols? (do so if we have vmlinux) */

int have_vmlinux = 0;

static int have_vmlinux = 0;

/* Is CONFIG_MODULE_SRCVERSION_ALL set? */

static int all_versions = 0;

/* If we are modposting external module set to 1 */
@@ -229,7 +229,7 @@ static struct symbol *find_symbol(const char *name) 
	return NULL;

}



static struct {

static const struct {

	const char *str;

	enum export export;

} export_list[] = {
@@ -805,7 +805,7 @@ static int match(const char *sym, const char * const pat[]) 
}



/* sections that we do not want to do full section mismatch check on */

static const char *section_white_list[] =

static const char *const section_white_list[] =

{

	".comment*",

	".debug*",
@@ -882,17 +882,18 @@ static void check_section(const char *modname, struct elf_info *elf, 
#define MEM_EXIT_SECTIONS  ".memexit.*"



/* init data sections */

static const char *init_data_sections[] = { ALL_INIT_DATA_SECTIONS, NULL };

static const char *const init_data_sections[] =

	{ ALL_INIT_DATA_SECTIONS, NULL };



/* all init sections */

static const char *init_sections[] = { ALL_INIT_SECTIONS, NULL };

static const char *const init_sections[] = { ALL_INIT_SECTIONS, NULL };



/* All init and exit sections (code + data) */

static const char *init_exit_sections[] =

static const char *const init_exit_sections[] =

	{ALL_INIT_SECTIONS, ALL_EXIT_SECTIONS, NULL };



/* data section */

static const char *data_sections[] = { DATA_SECTIONS, NULL };

static const char *const data_sections[] = { DATA_SECTIONS, NULL };





/* symbols in .data that may refer to init/exit sections */
@@ -906,8 +907,8 @@ static const char *data_sections[] = { DATA_SECTIONS, NULL }; 
	"*_probe_one",							\

	"*_console"



static const char *head_sections[] = { ".head.text*", NULL };

static const char *linker_symbols[] =

static const char *const head_sections[] = { ".head.text*", NULL };

static const char *const linker_symbols[] =

	{ "__init_begin", "_sinittext", "_einittext", NULL };



enum mismatch {
@@ -929,7 +930,7 @@ struct sectioncheck { 
	const char *symbol_white_list[20];

};



const struct sectioncheck sectioncheck[] = {

static const struct sectioncheck sectioncheck[] = {

/* Do not reference init/exit code/data from

 * normal code and data

 */