linux-kernel - [PATCH bpf-next] selftests/bpf: Fix the invalid operand for instruction issue

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Message-Id: <20250827031540.461017-1-yangfeng59949@163.com>
Date: Wed, 27 Aug 2025 11:15:40 +0800
From: Feng Yang <yangfeng59949@....com>
To: ast@...nel.org,
	daniel@...earbox.net,
	john.fastabend@...il.com,
	andrii@...nel.org,
	martin.lau@...ux.dev,
	eddyz87@...il.com,
	song@...nel.org,
	yonghong.song@...ux.dev,
	kpsingh@...nel.org,
	sdf@...ichev.me,
	haoluo@...gle.com,
	jolsa@...nel.org
Cc: bpf@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH bpf-next] selftests/bpf: Fix the invalid operand for instruction issue

From: Feng Yang <yangfeng@...inos.cn>

The following issue occurs when compiling with clang version 17.0.6,
but not with version 18.1.8. Add a version restriction to fix this problem.

progs/compute_live_registers.c:251:3: error: invalid operand for instruction
  251 |                 "r0 = 1;"
      |                 ^
<inline asm>:1:22: note: instantiated into assembly here
    1 |         r0 = 1;r2 = 2;if r1 & 0x7 goto +1;exit;r0 = r2;exit;
      |                             ^
1 error generated.

Fixes: 4a4b84ba9e453 ("selftests/bpf: verify jset handling in CFG computation")
Signed-off-by: Feng Yang <yangfeng@...inos.cn>
---
 tools/testing/selftests/bpf/progs/compute_live_registers.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/compute_live_registers.c b/tools/testing/selftests/bpf/progs/compute_live_registers.c
index 6884ab99a421..56aec43f206f 100644
--- a/tools/testing/selftests/bpf/progs/compute_live_registers.c
+++ b/tools/testing/selftests/bpf/progs/compute_live_registers.c
@@ -240,6 +240,7 @@ __naked void if2(void)
 		::: __clobber_all);
 }
 
+#if __clang_major__ >= 18
 /* Verifier misses that r2 is alive if jset is not handled properly */
 SEC("socket")
 __log_level(2)
@@ -255,6 +256,7 @@ __naked void if3_jset_bug(void)
 		"exit;"
 		::: __clobber_all);
 }
+#endif
 
 SEC("socket")
 __log_level(2)
-- 
2.43.0