kernel: add linux 5.10 support

Signed-off-by: Felix Fietkau <nbd@nbd.name>

1 files changed, 119 insertions, 0 deletions

diff --git a/target/linux/generic/pending-5.10/203-kallsyms_uncompressed.patch b/target/linux/generic/pending-5.10/203-kallsyms_uncompressed.patch
new file mode 100644
index 0000000000..35d0333ad5
--- /dev/null
+++ b/target/linux/generic/pending-5.10/203-kallsyms_uncompressed.patch
@@ -0,0 +1,119 @@
+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
+@@ -1384,6 +1384,17 @@ 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
+@@ -77,6 +77,11 @@ 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++;
+@@ -109,6 +114,9 @@ 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
+@@ -58,6 +58,7 @@ 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;
+ 
+@@ -480,6 +481,9 @@ static void write_src(void)
+ 
+ 	free(markers);
+ 
++	if (uncompressed)
++		return;
++
+ 	output_label("kallsyms_token_table");
+ 	off = 0;
+ 	for (i = 0; i < 256; i++) {
+@@ -531,6 +535,9 @@ 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];
+@@ -603,6 +610,9 @@ 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--) {
+@@ -767,6 +777,8 @@ 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
+@@ -186,6 +186,10 @@ kallsyms()
+ 		kallsymopt="${kallsymopt} --base-relative"
+ 	fi
+ 
++	if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then
++		kallsymopt="${kallsymopt} --uncompressed"
++	fi
++
+ 	info KSYMS ${2}
+ 	${NM} -n ${1} | scripts/kallsyms ${kallsymopt} > ${2}
+ }