linux-kernel - Re: [PATCH] selftests/bpf: Add powerpc support for get_preempt

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Message-Id: <ec269f64770e0c87c198d34bef01d818108015e8952d441d8708e5cf0e9c70b9@mail.kernel.org>
Date: Thu, 29 Jan 2026 06:07:22 +0000 (UTC)
From: bot+bpf-ci@...nel.org
To: skb99@...ux.ibm.com,linux-kernel@...r.kernel.org,linux-kselftest@...r.kernel.org,bpf@...r.kernel.org,linuxppc-dev@...ts.ozlabs.org
Cc: hbathini@...ux.ibm.com,sachinpb@...ux.ibm.com,venkat88@...ux.ibm.com,andrii@...nel.org,eddyz87@...il.com,ast@...nel.org,daniel@...earbox.net,martin.lau@...ux.dev,song@...nel.org,yonghong.song@...ux.dev,john.fastabend@...il.com,kpsingh@...nel.org,sdf@...ichev.me,haoluo@...gle.com,jolsa@...nel.org,christophe.leroy@...roup.eu,maddy@...ux.ibm.com,mpe@...erman.id.au,ast@...nel.org,andrii@...nel.org,daniel@...earbox.net,martin.lau@...nel.org,eddyz87@...il.com,yonghong.song@...ux.dev,clm@...a.com,ihor.solodrai@...ux.dev
Subject: Re: [PATCH] selftests/bpf: Add powerpc support for get_preempt_count() in selftest

> diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
> index a39576c8ba..147bbf6cd3 100644
> --- a/tools/testing/selftests/bpf/bpf_experimental.h
> +++ b/tools/testing/selftests/bpf/bpf_experimental.h
> @@ -627,6 +627,8 @@ static inline int get_preempt_count(void)
>  	return *(int *) bpf_this_cpu_ptr(&__preempt_count);
>  #elif defined(bpf_target_arm64)
>  	return bpf_get_current_task_btf()->thread_info.preempt.count;
> +#elif defined(bpf_target_powerpc)
> +	return bpf_get_current_task_btf()->thread_info.preempt_count;
>  #endif
>  	return 0;
>  }

Now that get_preempt_count() supports PowerPC, should the documentation
comments for bpf_in_interrupt(), bpf_in_nmi(), bpf_in_hardirq(),
bpf_in_serving_softirq(), and bpf_in_task() be updated to include
PowerPC in their supported architecture lists? Currently these comments
still say "Only works on the following archs: x86, arm64" but they now
also work on PowerPC via this change to get_preempt_count().

---
AI reviewed your patch. Please fix the bug or email reply why it's not a bug.
See: https://github.com/kernel-patches/vmtest/blob/master/ci/claude/README.md

CI run summary: https://github.com/kernel-patches/bpf/actions/runs/21467281843

AI-authorship-score: low
AI-authorship-explanation: Straightforward kernel patch with natural technical writing style and minimal code changes consistent with human-authored commits.
issues-found: 1
issue-severity-score: low
issue-severity-explanation: Documentation comments not updated to reflect PowerPC support in helper functions; minor documentation mismatch in test code.