linux-kernel - [PATCH 07/11] objtool: Fix verbose disassembly if CROSS

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Message-ID: <b931a4786bc0127aa4c94e8b35ed617dcbd3d3da.1743481539.git.jpoimboe@kernel.org>
Date: Mon, 31 Mar 2025 21:26:42 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	David Laight <david.laight.linux@...il.com>
Subject: [PATCH 07/11] objtool: Fix verbose disassembly if CROSS_COMPILE isn't set

From: David Laight <david.laight.linux@...il.com>

In verbose mode, when printing the disassembly of affected functions, if
CROSS_COMPILE isn't set, the objdump command string gets prefixed with
"(null)".

Somehow this worked before.  Maybe some versions of glibc return an
empty string instead of NULL.  Fix it regardless.

[ jpoimboe: Rewrite commit log. ]

Fixes: ca653464dd097 ("objtool: Add verbose option for disassembling affected functions")
Signed-off-by: David Laight <david.laight.linux@...il.com>
Link: https://lore.kernel.org/r/20250215142321.14081-1-david.laight.linux@gmail.com
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 tools/objtool/check.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index ff83be1aab1d..4a1f6c3169b3 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -4523,6 +4523,8 @@ static void disas_funcs(const char *funcs)
 	char *cmd;
 
 	cross_compile = getenv("CROSS_COMPILE");
+	if (!cross_compile)
+		cross_compile = "";
 
 	objdump_str = "%sobjdump -wdr %s | gawk -M -v _funcs='%s' '"
 			"BEGIN { split(_funcs, funcs); }"
-- 
2.48.1