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- From: Felix Fietkau <nbd@nbd.name>
- Subject: kernel: add a config option for keeping the kallsyms table uncompressed, saving ~9kb kernel size after lzma on ar71xx
- [john@phrozen.org: added to my upstream queue 30.12.2016]
- lede-commit: e0e3509b5ce2ccf93d4d67ea907613f5f7ec2eed
- Signed-off-by: Felix Fietkau <nbd@nbd.name>
- ---
- 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
- @@ -1370,6 +1370,17 @@ 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
- @@ -113,6 +113,11 @@ 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++;
- @@ -145,6 +150,9 @@ 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
- @@ -61,6 +61,7 @@ static struct addr_range percpu_range =
- static struct sym_entry *table;
- static unsigned int table_size, table_cnt;
- static int all_symbols = 0;
- +static int uncompressed = 0;
- static int absolute_percpu = 0;
- static char symbol_prefix_char = '\0';
- static int base_relative = 0;
- @@ -446,6 +447,9 @@ static void write_src(void)
-
- free(markers);
-
- + if (uncompressed)
- + return;
- +
- output_label("kallsyms_token_table");
- off = 0;
- for (i = 0; i < 256; i++) {
- @@ -504,6 +508,9 @@ 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];
- @@ -576,6 +583,9 @@ 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--) {
- @@ -764,6 +774,8 @@ int main(int argc, char **argv)
- symbol_prefix_char = *p;
- } else if (strcmp(argv[i], "--base-relative") == 0)
- base_relative = 1;
- + else if (strcmp(argv[i], "--uncompressed") == 0)
- + uncompressed = 1;
- else
- usage();
- }
- --- a/scripts/link-vmlinux.sh
- +++ b/scripts/link-vmlinux.sh
- @@ -136,6 +136,10 @@ kallsyms()
- kallsymopt="${kallsymopt} --base-relative"
- fi
-
- + if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then
- + kallsymopt="${kallsymopt} --uncompressed"
- + fi
- +
- local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
- ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
-
|
