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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(+)
diff --git a/init/Kconfig b/init/Kconfig
index 34407f15e6d3..9063c81b9665 100644
--- 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
diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index fafd1a3ef0da..abe49579212f 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -113,6 +113,11 @@ static unsigned int kallsyms_expand_symbol(unsigned int off,
* 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 @@ static unsigned int kallsyms_expand_symbol(unsigned int off,
*/
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.
diff --git a/scripts/kallsyms.c b/scripts/kallsyms.c
index 1f22a186c18c..e7f0f19e39a9 100644
--- 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 *str, int len, unsigned char *token)
{
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();
}
diff --git a/scripts/link-vmlinux.sh b/scripts/link-vmlinux.sh
index f742c65108b9..6aabf1d71bb6 100755
--- 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}"
--
2.11.0
|
