Enabling CONFIG_MEM_ALLOC_PROFILING_DEBUG with CONFIG_SAMPLE_LIVEPATCH
results in the following error:

  samples/livepatch/livepatch-shadow-fix1.o: error: objtool: static_call: can't find static_call_key symbol: __SCK__WARN_trap

This is caused an extra file->klp sanity check which was added by commit
164c9201e1da ("objtool: Add base objtool support for livepatch
modules").  That check was intended to ensure that livepatch modules
built with klp-build always have full access to their static call keys.

However, it failed to account for the fact that manually built livepatch
modules (i.e., not built with klp-build) might need access to unexported
static call keys, for which read-only access is typically allowed for
modules.

While the livepatch-shadow-fix1 module doesn't explicitly use any static
calls, it does have a memory allocation, which can cause
CONFIG_MEM_ALLOC_PROFILING_DEBUG to insert a WARN() call.  And WARN() is
now an unexported static call as of commit 860238af7a33 ("x86_64/bug:
Inline the UD1").

Fix it by removing the overzealous file->klp check, restoring the
original behavior for manually built livepatch modules.

Fixes: 164c9201e1da ("objtool: Add base objtool support for livepatch modules")
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 tools/objtool/check.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/objtool/check.c b/tools/objtool/check.c
index 933868ee3beb..ef451cd6277c 100644
--- a/tools/objtool/check.c
+++ b/tools/objtool/check.c
@@ -682,7 +682,7 @@ static int create_static_call_sections(struct objtool_file *file)
 
 		key_sym = find_symbol_by_name(file->elf, tmp);
 		if (!key_sym) {
-			if (!opts.module || file->klp) {
+			if (!opts.module) {
 				ERROR("static_call: can't find static_call_key symbol: %s", tmp);
 				return -1;
 			}
-- 
2.52.0

On Mon, Feb 2, 2026 at 11:00 AM Josh Poimboeuf <jpoimboe@kernel.org> wrote:
>
> Enabling CONFIG_MEM_ALLOC_PROFILING_DEBUG with CONFIG_SAMPLE_LIVEPATCH
> results in the following error:
>
>   samples/livepatch/livepatch-shadow-fix1.o: error: objtool: static_call: can't find static_call_key symbol: __SCK__WARN_trap
>
> This is caused an extra file->klp sanity check which was added by commit
> 164c9201e1da ("objtool: Add base objtool support for livepatch
> modules").  That check was intended to ensure that livepatch modules
> built with klp-build always have full access to their static call keys.
>
> However, it failed to account for the fact that manually built livepatch
> modules (i.e., not built with klp-build) might need access to unexported
> static call keys, for which read-only access is typically allowed for
> modules.
>
> While the livepatch-shadow-fix1 module doesn't explicitly use any static
> calls, it does have a memory allocation, which can cause
> CONFIG_MEM_ALLOC_PROFILING_DEBUG to insert a WARN() call.  And WARN() is
> now an unexported static call as of commit 860238af7a33 ("x86_64/bug:
> Inline the UD1").
>
> Fix it by removing the overzealous file->klp check, restoring the
> original behavior for manually built livepatch modules.
>
> Fixes: 164c9201e1da ("objtool: Add base objtool support for livepatch modules")
> Reported-by: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>

Acked-by: Song Liu <song@kernel.org>