linux-kernel - [PATCH] move kallsyms data to .rodata

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Date:	Mon, 04 Dec 2006 16:27:46 +0000
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<linux-kernel@...r.kernel.org>
Subject: [PATCH] move kallsyms data to .rodata

Kallsyms data is never written to, so it can as well benefit from
CONFIG_DEBUG_RODATA.

Signed-off-by: Jan Beulich <jbeulich@...ell.com>

--- linux-2.6.19/kernel/kallsyms.c	2006-11-29 22:57:37.000000000 +0100
+++ 2.6.19-kallsyms-rodata/kernel/kallsyms.c	2006-12-04 15:20:16.000000000 +0100
@@ -30,14 +30,14 @@
 #endif
 
 /* These will be re-linked against their real values during the second link stage */
-extern unsigned long kallsyms_addresses[] __attribute__((weak));
-extern unsigned long kallsyms_num_syms __attribute__((weak,section("data")));
-extern u8 kallsyms_names[] __attribute__((weak));
+extern const unsigned long kallsyms_addresses[] __attribute__((weak));
+extern const unsigned long kallsyms_num_syms __attribute__((weak));
+extern const u8 kallsyms_names[] __attribute__((weak));
 
-extern u8 kallsyms_token_table[] __attribute__((weak));
-extern u16 kallsyms_token_index[] __attribute__((weak));
+extern const u8 kallsyms_token_table[] __attribute__((weak));
+extern const u16 kallsyms_token_index[] __attribute__((weak));
 
-extern unsigned long kallsyms_markers[] __attribute__((weak));
+extern const unsigned long kallsyms_markers[] __attribute__((weak));
 
 static inline int is_kernel_inittext(unsigned long addr)
 {
@@ -83,7 +83,7 @@ static int is_ksym_addr(unsigned long ad
 static unsigned int kallsyms_expand_symbol(unsigned int off, char *result)
 {
 	int len, skipped_first = 0;
-	u8 *tptr, *data;
+	const u8 *tptr, *data;
 
 	/* get the compressed symbol length from the first symbol byte */
 	data = &kallsyms_names[off];
@@ -131,7 +131,7 @@ static char kallsyms_get_symbol_type(uns
  * kallsyms array */
 static unsigned int get_symbol_offset(unsigned long pos)
 {
-	u8 *name;
+	const u8 *name;
 	int i;
 
 	/* use the closest marker we have. We have markers every 256 positions,
--- linux-2.6.19/scripts/kallsyms.c	2006-11-29 22:57:37.000000000 +0100
+++ 2.6.19-kallsyms-rodata/scripts/kallsyms.c	2006-12-04 15:25:57.000000000 +0100
@@ -263,7 +263,7 @@ static void write_src(void)
 	printf("#define ALGN .align 4\n");
 	printf("#endif\n");
 
-	printf(".data\n");
+	printf("\t.section .rodata, \"a\"\n");
 
 	output_label("kallsyms_addresses");
 	for (i = 0; i < table_cnt; i++) {


-
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