objtool: Include backtrace in verbose mode

Include backtrace in verbose mode.  This makes it easy to gather all the
information needed for diagnosing objtool warnings.

Reviewed-by: Miroslav Benes <mbenes@suse.cz>
Link: https://lore.kernel.org/r/c255224fabcf7e64bac232fec1c77c9fc2d7d7ab.1681853186.git.jpoimboe@kernel.org
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

Author: jpoimboe

tools/objtool/Documentation/objtool.txt

@@ -246,8 +246,8 @@ Objtool warnings
 
 NOTE: When requesting help with an objtool warning, please recreate with
 OBJTOOL_VERBOSE=1 (e.g., "make OBJTOOL_VERBOSE=1") and send the full
-output, including any disassembly below the warning, to the objtool
-maintainers.
+output, including any disassembly or backtrace below the warning, to the
+objtool maintainers.
 
 For asm files, if you're getting an error which doesn't make sense,
 first make sure that the affected code follows the above rules.

tools/objtool/check.c

@@ -3657,8 +3657,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
 
 				ret = validate_branch(file, func, alt->insn, state);
 				if (ret) {
-					if (opts.backtrace)
-						BT_FUNC("(alt)", insn);
+					BT_INSN(insn, "(alt)");
 					return ret;
 				}
 			}
@@ -3703,8 +3702,7 @@ static int validate_branch(struct objtool_file *file, struct symbol *func,
 				ret = validate_branch(file, func,
 						      insn->jump_dest, state);
 				if (ret) {
-					if (opts.backtrace)
-						BT_FUNC("(branch)", insn);
+					BT_INSN(insn, "(branch)");
 					return ret;
 				}
 			}
@@ -3802,8 +3800,8 @@ static int validate_unwind_hint(struct objtool_file *file,
 {
 	if (insn->hint && !insn->visited && !insn->ignore) {
 		int ret = validate_branch(file, insn_func(insn), insn, *state);
-		if (ret && opts.backtrace)
-			BT_FUNC("<=== (hint)", insn);
+		if (ret)
+			BT_INSN(insn, "<=== (hint)");
 		return ret;
 	}
 
@@ -3861,8 +3859,7 @@ static int validate_unret(struct objtool_file *file, struct instruction *insn)
 
 				ret = validate_unret(file, alt->insn);
 				if (ret) {
-				        if (opts.backtrace)
-						BT_FUNC("(alt)", insn);
+					BT_INSN(insn, "(alt)");
 					return ret;
 				}
 			}
@@ -3888,10 +3885,8 @@ static int validate_unret(struct objtool_file *file, struct instruction *insn)
 				}
 				ret = validate_unret(file, insn->jump_dest);
 				if (ret) {
-					if (opts.backtrace) {
-						BT_FUNC("(branch%s)", insn,
-							insn->type == INSN_JUMP_CONDITIONAL ? "-cond" : "");
-					}
+					BT_INSN(insn, "(branch%s)",
+						insn->type == INSN_JUMP_CONDITIONAL ? "-cond" : "");
 					return ret;
 				}
 
@@ -3913,8 +3908,7 @@ static int validate_unret(struct objtool_file *file, struct instruction *insn)
 
 			ret = validate_unret(file, dest);
 			if (ret) {
-				if (opts.backtrace)
-					BT_FUNC("(call)", insn);
+				BT_INSN(insn, "(call)");
 				return ret;
 			}
 			/*
@@ -4216,8 +4210,8 @@ static int validate_symbol(struct objtool_file *file, struct section *sec,
 	state->uaccess = sym->uaccess_safe;
 
 	ret = validate_branch(file, insn_func(insn), insn, *state);
-	if (ret && opts.backtrace)
-		BT_FUNC("<=== (sym)", insn);
+	if (ret)
+		BT_INSN(insn, "<=== (sym)");
 	return ret;
 }
 

tools/objtool/include/objtool/warn.h

@@ -63,12 +63,14 @@ static inline char *offstr(struct section *sec, unsigned long offset)
 		_insn->sym->warned = 1;					\
 })
 
-#define BT_FUNC(format, insn, ...)			\
-({							\
-	struct instruction *_insn = (insn);		\
-	char *_str = offstr(_insn->sec, _insn->offset); \
-	WARN("  %s: " format, _str, ##__VA_ARGS__);	\
-	free(_str);					\
+#define BT_INSN(insn, format, ...)				\
+({								\
+	if (opts.verbose || opts.backtrace) {			\
+		struct instruction *_insn = (insn);		\
+		char *_str = offstr(_insn->sec, _insn->offset); \
+		WARN("  %s: " format, _str, ##__VA_ARGS__);	\
+		free(_str);					\
+	}							\
 })
 
 #define WARN_ELF(format, ...)				\