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- From: Felix Fietkau <[email protected]>
- Subject: kernel: add a config option for keeping the kallsyms table uncompressed, saving ~9kb kernel size after lzma on ar71xx
- [[email protected]: added to my upstream queue 30.12.2016]
- lede-commit: e0e3509b5ce2ccf93d4d67ea907613f5f7ec2eed
- Signed-off-by: Felix Fietkau <[email protected]>
- ---
- init/Kconfig | 11 +++++++++++
- kernel/kallsyms.c | 8 ++++++++
- scripts/kallsyms.c | 12 ++++++++++++
- scripts/link-vmlinux.sh | 4 ++++
- 4 files changed, 35 insertions(+)
- --- a/init/Kconfig
- +++ b/init/Kconfig
- @@ -1491,6 +1491,17 @@ config SYSCTL_ARCH_UNALIGN_ALLOW
- the unaligned access emulation.
- see arch/parisc/kernel/unaligned.c for reference
-
- +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 HAVE_PCSPKR_PLATFORM
- bool
-
- --- a/kernel/kallsyms.c
- +++ b/kernel/kallsyms.c
- @@ -69,6 +69,11 @@ 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++;
- @@ -101,6 +106,9 @@ tail:
- */
- 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.
- --- a/scripts/kallsyms.c
- +++ b/scripts/kallsyms.c
- @@ -77,6 +77,7 @@ static struct addr_range percpu_range =
- static struct sym_entry **table;
- static unsigned int table_size, table_cnt;
- static int all_symbols;
- +static int uncompressed;
- static int absolute_percpu;
- static int base_relative;
- static int lto_clang;
- @@ -608,6 +609,9 @@ static void write_src(void)
- (unsigned char)(table[i]->seq >> 0));
- printf("\n");
-
- + if (uncompressed)
- + return;
- +
- output_label("kallsyms_token_table");
- off = 0;
- for (i = 0; i < 256; i++) {
- @@ -659,6 +663,9 @@ static unsigned char *find_token(unsigne
- {
- 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];
- @@ -731,6 +738,9 @@ 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--) {
- @@ -892,6 +902,7 @@ int main(int argc, char **argv)
- {"absolute-percpu", no_argument, &absolute_percpu, 1},
- {"base-relative", no_argument, &base_relative, 1},
- {"lto-clang", no_argument, <o_clang, 1},
- + {"uncompressed", no_argument, &uncompressed, 1},
- {},
- };
-
- --- a/scripts/link-vmlinux.sh
- +++ b/scripts/link-vmlinux.sh
- @@ -165,6 +165,10 @@ kallsyms()
- kallsymopt="${kallsymopt} --lto-clang"
- fi
-
- + if is_enabled CONFIG_KALLSYMS_UNCOMPRESSED; then
- + kallsymopt="${kallsymopt} --uncompressed"
- + fi
- +
- info KSYMS ${2}
- scripts/kallsyms ${kallsymopt} ${1} > ${2}
- }
|
