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119 lines
3.4 KiB
119 lines
3.4 KiB
From: Felix Fietkau <nbd@nbd.name>
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Subject: kernel: add a config option for keeping the kallsyms table uncompressed, saving ~9kb kernel size after lzma on ar71xx
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[john@phrozen.org: added to my upstream queue 30.12.2016]
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lede-commit: e0e3509b5ce2ccf93d4d67ea907613f5f7ec2eed
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Signed-off-by: Felix Fietkau <nbd@nbd.name>
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---
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init/Kconfig | 11 +++++++++++
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kernel/kallsyms.c | 8 ++++++++
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scripts/kallsyms.c | 12 ++++++++++++
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scripts/link-vmlinux.sh | 4 ++++
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4 files changed, 35 insertions(+)
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--- a/init/Kconfig
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+++ b/init/Kconfig
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@@ -1146,6 +1146,17 @@ config SYSCTL_ARCH_UNALIGN_ALLOW
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the unaligned access emulation.
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see arch/parisc/kernel/unaligned.c for reference
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+config KALLSYMS_UNCOMPRESSED
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+ bool "Keep kallsyms uncompressed"
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+ depends on KALLSYMS
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+ help
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+ Normally kallsyms contains compressed symbols (using a token table),
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+ reducing the uncompressed kernel image size. Keeping the symbol table
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+ uncompressed significantly improves the size of this part in compressed
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+ kernel images.
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+
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+ Say N unless you need compressed kernel images to be small.
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+
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config HAVE_PCSPKR_PLATFORM
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bool
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--- a/kernel/kallsyms.c
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+++ b/kernel/kallsyms.c
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@@ -74,6 +74,11 @@ static unsigned int kallsyms_expand_symb
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* For every byte on the compressed symbol data, copy the table
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* entry for that byte.
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*/
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+#ifdef CONFIG_KALLSYMS_UNCOMPRESSED
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+ memcpy(result, data + 1, len - 1);
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+ result += len - 1;
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+ len = 0;
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+#endif
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while (len) {
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tptr = &kallsyms_token_table[kallsyms_token_index[*data]];
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data++;
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@@ -106,6 +111,9 @@ tail:
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*/
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static char kallsyms_get_symbol_type(unsigned int off)
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{
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+#ifdef CONFIG_KALLSYMS_UNCOMPRESSED
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+ return kallsyms_names[off + 1];
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+#endif
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/*
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* Get just the first code, look it up in the token table,
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* and return the first char from this token.
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--- a/scripts/kallsyms.c
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+++ b/scripts/kallsyms.c
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@@ -61,6 +61,7 @@ static struct addr_range percpu_range =
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static struct sym_entry *table;
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static unsigned int table_size, table_cnt;
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static int all_symbols = 0;
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+static int uncompressed = 0;
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static int absolute_percpu = 0;
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static int base_relative = 0;
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@@ -439,6 +440,9 @@ static void write_src(void)
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free(markers);
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+ if (uncompressed)
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+ return;
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+
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output_label("kallsyms_token_table");
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off = 0;
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for (i = 0; i < 256; i++) {
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@@ -497,6 +501,9 @@ static void *find_token(unsigned char *s
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{
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int i;
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+ if (uncompressed)
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+ return NULL;
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+
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for (i = 0; i < len - 1; i++) {
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if (str[i] == token[0] && str[i+1] == token[1])
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return &str[i];
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@@ -569,6 +576,9 @@ static void optimize_result(void)
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{
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int i, best;
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+ if (uncompressed)
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+ return;
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+
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/* using the '\0' symbol last allows compress_symbols to use standard
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* fast string functions */
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for (i = 255; i >= 0; i--) {
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@@ -751,6 +761,8 @@ int main(int argc, char **argv)
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absolute_percpu = 1;
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else if (strcmp(argv[i], "--base-relative") == 0)
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base_relative = 1;
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+ else if (strcmp(argv[i], "--uncompressed") == 0)
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+ uncompressed = 1;
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else
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usage();
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}
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--- a/scripts/link-vmlinux.sh
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+++ b/scripts/link-vmlinux.sh
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@@ -133,6 +133,10 @@ kallsyms()
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kallsymopt="${kallsymopt} --base-relative"
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fi
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+ if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then
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+ kallsymopt="${kallsymopt} --uncompressed"
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+ fi
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+
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local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL} \
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${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
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