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

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

[Mikulas Patocka]

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@redhat.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);						\
 	}								\
 })

Re: [PATCH] objtool: fix compilation failure with the x32 toolchain

[Joe Lawrence]

On Tue, Jan 06, 2026 at 12:13:15PM +0100, Mikulas Patocka wrote:
> 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@redhat.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);						\
>  	}								\
>  })
> 

Acked-by: Joe Lawrence <joe.lawrence@redhat.com>

--
Joe

[tip: objtool/urgent] objtool: fix compilation failure with the x32 toolchain

[tip-bot2 for Mikulas Patocka]

The following commit has been merged into the objtool/urgent branch of tip:

Commit-ID:     26bea10450afe5ad4dd0e0bbb797c44e1df110fe
Gitweb:        https://git.kernel.org/tip/26bea10450afe5ad4dd0e0bbb797c44e1df110fe
Author:        Mikulas Patocka <mpatocka@redhat.com>
AuthorDate:    Tue, 06 Jan 2026 12:13:15 +01:00
Committer:     Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 13 Jan 2026 11:37:50 +01:00

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.

Fixes: a3493b33384a ("objtool/klp: Add --debug-checksum=<funcs> to show per-instruction checksums")

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/a1158c99-fe0e-a218-4b5b-ffac212489f6@redhat.com
---
 tools/objtool/include/objtool/warn.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/tools/objtool/include/objtool/warn.h b/tools/objtool/include/objtool/warn.h
index 25ff794..2b27b54 100644
--- a/tools/objtool/include/objtool/warn.h
+++ b/tools/objtool/include/objtool/warn.h
@@ -152,8 +152,8 @@ static inline void unindent(int *unused) { indent--; }
 	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);						\
 	}								\
 })