kbuild: Speed up kallsyms generation

This patch basically just replaces the scripts/kallsyms script by
a scripts/kallsyms.c C program, which does the same thing much faster.

It also removes duplicates and entries which are not between _stext and
_etext, as they would not get used anyway. This saves about 290KB in
vmlinux with my .config, more than 50% of the kallsyms bloat ;)

1 files changed, 5 insertions, 8 deletions

diff --git a/kernel/kallsyms.c b/kernel/kallsyms.c
index 0335cc7fe4a1..bb880ba4e776 100644
--- a/kernel/kallsyms.c
+++ b/kernel/kallsyms.c
@@ -45,14 +45,11 @@ const char *kallsyms_lookup(unsigned long addr,
 		for (i = 0; i < best; i++)
 			name += strlen(name)+1;
 
-		/* Base symbol size on next symbol, but beware aliases. */
-		symbol_end = (unsigned long)_etext;
-		for (i = best+1; i < kallsyms_num_syms; i++) {
-			if (kallsyms_addresses[i] != kallsyms_addresses[best]){
-				symbol_end = kallsyms_addresses[i];
-				break;
-			}
-		}
+		/* Base symbol size on next symbol. */
+		if (best + 1 < kallsyms_num_syms)
+			symbol_end = kallsyms_addresses[best + 1];
+		else
+			symbol_end = (unsigned long)_etext;
 
 		*symbolsize = symbol_end - kallsyms_addresses[best];
 		*modname = NULL;