linux-kernel - [PATCH] objtool: fix compilation failure with the x32 toolchain

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Message-ID: <a1158c99-fe0e-a218-4b5b-ffac212489f6@redhat.com>
Date: Tue, 6 Jan 2026 12:13:15 +0100 (CET)
From: Mikulas Patocka <mpatocka@...hat.com>
To: Josh Poimboeuf <jpoimboe@...nel.org>, 
    Peter Zijlstra <peterz@...radead.org>, Petr Mladek <pmladek@...e.com>, 
    Joe Lawrence <joe.lawrence@...hat.com>
cc: linux-kernel@...r.kernel.org
Subject: [PATCH] objtool: fix compilation failure with the x32 toolchain

When using the x32 toolchain, compilation fails because the printf 
specifier "%lx" (long), doesn't match the type of the "checksum" variable 
(long long). Fix this by changing the printf specifier to "%llx" and 
casting "checksum" to unsigned long long.

Signed-off-by: Mikulas Patocka <mpatocka@...hat.com>
Fixes: a3493b33384a ("objtool/klp: Add --debug-checksum=<funcs> to show per-instruction checksums")

---
 tools/objtool/include/objtool/warn.h |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

Index: linux-2.6/tools/objtool/include/objtool/warn.h
===================================================================
--- linux-2.6.orig/tools/objtool/include/objtool/warn.h	2025-12-31 20:10:31.000000000 +0100
+++ linux-2.6/tools/objtool/include/objtool/warn.h	2025-12-31 20:14:15.000000000 +0100
@@ -152,8 +152,8 @@ static inline void unindent(int *unused)
 	if (unlikely(insn->sym && insn->sym->pfunc &&			\
 		     insn->sym->pfunc->debug_checksum)) {		\
 		char *insn_off = offstr(insn->sec, insn->offset);	\
-		__dbg("checksum: %s %s %016lx",				\
-		      func->name, insn_off, checksum);			\
+		__dbg("checksum: %s %s %016llx",			\
+		      func->name, insn_off, (unsigned long long)checksum);\
 		free(insn_off);						\
 	}								\
 })