Merge tag 'objtool-core-2023-10-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull objtool updates from Ingo Molnar:
 "Misc fixes and cleanups:

   - Fix potential MAX_NAME_LEN limit related build failures

   - Fix scripts/faddr2line symbol filtering bug

   - Fix scripts/faddr2line on LLVM=1

   - Fix scripts/faddr2line to accept readelf output with mapping
     symbols

   - Minor cleanups"

* tag 'objtool-core-2023-10-28' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  scripts/faddr2line: Skip over mapping symbols in output from readelf
  scripts/faddr2line: Use LLVM addr2line and readelf if LLVM=1
  scripts/faddr2line: Don't filter out non-function symbols from readelf
  objtool: Remove max symbol name length limitation
  objtool: Propagate early errors
  objtool: Use 'the fallthrough' pseudo-keyword
  x86/speculation, objtool: Use absolute relocations for annotations
  x86/unwind/orc: Remove redundant initialization of 'mid' pointer in __orc_find()

tools/objtool/arch/x86/decode.c

@@ -291,7 +291,7 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 		switch (modrm_reg & 7) {
 		case 5:
 			imm = -imm;
-			/* fallthrough */
+			fallthrough;
 		case 0:
 			/* add/sub imm, %rsp */
 			ADD_OP(op) {
@@ -375,7 +375,7 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 			break;
 		}
 
-		/* fallthrough */
+		fallthrough;
 	case 0x88:
 		if (!rex_w)
 			break;
@@ -656,7 +656,7 @@ int arch_decode_instruction(struct objtool_file *file, const struct section *sec
 			break;
 		}
 
-		/* fallthrough */
+		fallthrough;
 
 	case 0xca: /* retf */
 	case 0xcb: /* retf */

tools/objtool/elf.c

@@ -22,8 +22,6 @@
 #include <objtool/elf.h>
 #include <objtool/warn.h>
 
-#define MAX_NAME_LEN 128
-
 static inline u32 str_hash(const char *str)
 {
 	return jhash(str, strlen(str), 0);
@@ -515,7 +513,7 @@ static int read_symbols(struct elf *elf)
 	/* Create parent/child links for any cold subfunctions */
 	list_for_each_entry(sec, &elf->sections, list) {
 		sec_for_each_sym(sec, sym) {
-			char pname[MAX_NAME_LEN + 1];
+			char *pname;
 			size_t pnamelen;
 			if (sym->type != STT_FUNC)
 				continue;
@@ -531,15 +529,15 @@ static int read_symbols(struct elf *elf)
 				continue;
 
 			pnamelen = coldstr - sym->name;
-			if (pnamelen > MAX_NAME_LEN) {
-				WARN("%s(): parent function name exceeds maximum length of %d characters",
-				     sym->name, MAX_NAME_LEN);
+			pname = strndup(sym->name, pnamelen);
+			if (!pname) {
+				WARN("%s(): failed to allocate memory",
+				     sym->name);
 				return -1;
 			}
 
-			strncpy(pname, sym->name, pnamelen);
-			pname[pnamelen] = '\0';
 			pfunc = find_symbol_by_name(elf, pname);
+			free(pname);
 
 			if (!pfunc) {
 				WARN("%s(): can't find parent function",

tools/objtool/objtool.c

@@ -146,7 +146,5 @@ int main(int argc, const char **argv)
 	exec_cmd_init("objtool", UNUSED, UNUSED, UNUSED);
 	pager_init(UNUSED);
 
-	objtool_run(argc, argv);
-
-	return 0;
+	return objtool_run(argc, argv);
 }