kernel: add a config option for keeping the kallsyms table uncompressed, saving ...
authorFelix Fietkau <nbd@openwrt.org>
Mon, 14 Jan 2013 16:08:18 +0000 (16:08 +0000)
committerFelix Fietkau <nbd@openwrt.org>
Mon, 14 Jan 2013 16:08:18 +0000 (16:08 +0000)
SVN-Revision: 35154

target/linux/generic/config-3.7
target/linux/generic/patches-3.7/203-kallsyms_uncompressed.patch [new file with mode: 0644]

index b761d6c..f2147e1 100644 (file)
@@ -1343,6 +1343,7 @@ CONFIG_JOLIET=y
 # CONFIG_JUMP_LABEL is not set
 # CONFIG_KALLSYMS is not set
 # CONFIG_KALLSYMS_ALL is not set
+CONFIG_KALLSYMS_UNCOMPRESSED=y
 # CONFIG_KARMA_PARTITION is not set
 # CONFIG_KERNEL_BZIP2 is not set
 # CONFIG_KERNEL_GZIP is not set
diff --git a/target/linux/generic/patches-3.7/203-kallsyms_uncompressed.patch b/target/linux/generic/patches-3.7/203-kallsyms_uncompressed.patch
new file mode 100644 (file)
index 0000000..57655aa
--- /dev/null
@@ -0,0 +1,108 @@
+--- a/scripts/kallsyms.c
++++ b/scripts/kallsyms.c
+@@ -83,6 +83,7 @@ static struct text_range text_ranges[] =
+ static struct sym_entry *table;
+ static unsigned int table_size, table_cnt;
+ static int all_symbols = 0;
++static int uncompressed = 0;
+ static char symbol_prefix_char = '\0';
+ int token_profit[0x10000];
+@@ -389,6 +390,9 @@ static void write_src(void)
+       free(markers);
++      if (uncompressed)
++              return;
++
+       output_label("kallsyms_token_table");
+       off = 0;
+       for (i = 0; i < 256; i++) {
+@@ -447,6 +451,9 @@ 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];
+@@ -519,6 +526,9 @@ 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--) {
+@@ -675,7 +685,9 @@ int main(int argc, char **argv)
+                               if ((*p == '"' && *(p+2) == '"') || (*p == '\'' && *(p+2) == '\''))
+                                       p++;
+                               symbol_prefix_char = *p;
+-                      } else
++                      } else if (strcmp(argv[i], "--uncompressed") == 0)
++                              uncompressed = 1;
++                      else
+                               usage();
+               }
+       } else if (argc != 1)
+--- a/init/Kconfig
++++ b/init/Kconfig
+@@ -1198,6 +1198,17 @@ config KALLSYMS_ALL
+          Say N unless you really need all symbols.
++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 HOTPLUG
+       def_bool y
+--- a/scripts/link-vmlinux.sh
++++ b/scripts/link-vmlinux.sh
+@@ -83,6 +83,10 @@ kallsyms()
+               kallsymopt="${kallsymopt} --all-symbols"
+       fi
++      if [ -n "${CONFIG_KALLSYMS_UNCOMPRESSED}" ]; then
++              kallsymopt="${kallsymopt} --uncompressed"
++      fi
++
+       local aflags="${KBUILD_AFLAGS} ${KBUILD_AFLAGS_KERNEL}               \
+                     ${NOSTDINC_FLAGS} ${LINUXINCLUDE} ${KBUILD_CPPFLAGS}"
+--- a/kernel/kallsyms.c
++++ b/kernel/kallsyms.c
+@@ -106,6 +106,11 @@ 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++;
+@@ -133,6 +138,9 @@ static unsigned int kallsyms_expand_symb
+  */
+ 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.