You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
120 lines
3.4 KiB
Diff
120 lines
3.4 KiB
Diff
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
|
|
@@ -1295,6 +1295,17 @@ 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
|
|
@@ -75,6 +75,11 @@ 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++;
|
|
@@ -107,6 +112,9 @@ 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
|
|
@@ -59,6 +59,7 @@ 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 int base_relative = 0;
|
|
|
|
@@ -440,6 +441,9 @@ static void write_src(void)
|
|
|
|
free(markers);
|
|
|
|
+ if (uncompressed)
|
|
+ return;
|
|
+
|
|
output_label("kallsyms_token_table");
|
|
off = 0;
|
|
for (i = 0; i < 256; i++) {
|
|
@@ -500,6 +504,9 @@ 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];
|
|
@@ -572,6 +579,9 @@ 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--) {
|
|
@@ -751,6 +761,8 @@ int main(int argc, char **argv)
|
|
absolute_percpu = 1;
|
|
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
|
|
@@ -152,6 +152,10 @@ 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}"
|
|
|