linux-kernel - Re: [PATCH v2 bpf-next] selftests/bpf: Fix the invalid operand for instruction issue

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Message-ID: <7a037c0579e1cbabb83935c05c24ddbc6bc43327.camel@gmail.com>
Date: Thu, 04 Sep 2025 08:48:45 -0700
From: Eduard Zingerman <eddyz87@...il.com>
To: Feng Yang <yangfeng59949@....com>, ast@...nel.org, daniel@...earbox.net,
 	john.fastabend@...il.com, andrii@...nel.org, martin.lau@...ux.dev,
 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: Re: [PATCH v2 bpf-next] selftests/bpf: Fix the invalid operand for
 instruction issue

On Thu, 2025-08-28 at 10:01 +0800, Feng Yang wrote:
> From: Feng Yang <yangfeng@...inos.cn>
> 
> The following issue occurs when compiling with clang version 17.0.6:
> 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.
> 
> Use __imm_insn to fix this issue.
> 
> Fixes: 4a4b84ba9e453 ("selftests/bpf: verify jset handling in CFG computation")
> Signed-off-by: Feng Yang <yangfeng@...inos.cn>
> ---

Hi Feng,

This message felt through cracks a bit.  It's a minor thing, of
course, but there is a legit question of how much backward we'd like
to support clang versions for the test suite.

Could you please provide some detail on your build environment,
why do you want to run the tests with older clang?

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