--- a/scripts/kallsyms.c +++ b/scripts/kallsyms.c @@ -54,6 +54,7 @@ static struct text_range text_ranges[] = static struct sym_entry *table; static unsigned int table_size, table_cnt; static int all_symbols = 0; +static int uncompressed = 0; static char symbol_prefix_char = '\0'; int token_profit[0x10000]; @@ -360,6 +361,9 @@ static void write_src(void) free(markers); + if (uncompressed) + return; + output_label("kallsyms_token_table"); off = 0; for (i = 0; i < 256; i++) { @@ -418,6 +422,9 @@ static void *find_token(unsigned char *s { int i; + if (uncompressed) + return NULL; + for (i = 0; i < len - 1; i++) { if (str[i] == token[0] && str[i+1] == token[1]) return &str[i]; @@ -490,6 +497,9 @@ static void optimize_result(void) { int i, best; + if (uncompressed) + return; + /* using the '\0' symbol last allows compress_symbols to use standard * fast string functions */ for (i = 255; i >= 0; i--) { @@ -646,7 +656,9 @@ int main(int argc, char **argv) if ((*p == '"' && *(p+2) == '"') || (*p == '\'' && *(p+2) == '\'')) p++; symbol_prefix_char = *p; - } else + } else if (strcmp(argv[i], "--uncompressed") == 0) + uncompressed = 1; + else usage(); } } else if (argc != 1) --- a/init/Kconfig +++ b/init/Kconfig @@ -1194,6 +1194,17 @@ config KALLSYMS_ALL Say N unless you really need all symbols. +config KALLSYMS_UNCOMPRESSED + bool "Keep kallsyms uncompressed" + depends on KALLSYMS + help + Normally kallsyms contains compressed symbols (using a token table), + reducing the uncompressed kernel image size. Keeping the symbol table + uncompressed significantly improves the size of this part in compressed + kernel images. + + Say N unless you need compressed kernel images to be small. + config HOTPLUG def_bool y --- a/scripts/link-vmlinux.sh +++ b/scripts/link-vmlinux.sh @@ -83,6 +83,10 @@ kallsyms() kallsymopt="${kallsymopt} --all-symbols" fi + if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then + kallsymopt="${kallsymopt} --uncompressed" + fi + local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \ ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}" --- a/kernel/kallsyms.c +++ b/kernel/kallsyms.c @@ -106,6 +106,11 @@ static unsigned int kallsyms_expand_symb * For every byte on the compressed symbol data, copy the table * entry for that byte. */ +#ifdef CONFIG_KALLSYMS_UNCOMPRESSED + memcpy(result, data + 1, len - 1); + result += len - 1; + len = 0; +#endif while (len) { tptr = &kallsyms_token_table[kallsyms_token_index[*data]]; data++; @@ -133,6 +138,9 @@ static unsigned int kallsyms_expand_symb */ static char kallsyms_get_symbol_type(unsigned int off) { +#ifdef CONFIG_KALLSYMS_UNCOMPRESSED + return kallsyms_names[off + 1]; +#endif /* * Get just the first code, look it up in the token table, * and return the first char from this token.