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

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Message-ID: <20260129054035.168078-1-skb99@linux.ibm.com>
Date: Thu, 29 Jan 2026 11:10:35 +0530
From: Saket Kumar Bhaskar <skb99@...ux.ibm.com>
To: 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
Subject: [PATCH] selftests/bpf: Add powerpc support for get_preempt_count() in selftest

get_preempt_count() is enabled to return preempt_count for powerpc,
so that bpf_in_interrupt()/get_preempt_count() works for powerpc as
well.

Signed-off-by: Saket Kumar Bhaskar <skb99@...ux.ibm.com>
---
 tools/testing/selftests/bpf/bpf_experimental.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
index 2cd9165c7348..c3f039a878f3 100644
--- a/tools/testing/selftests/bpf/bpf_experimental.h
+++ b/tools/testing/selftests/bpf/bpf_experimental.h
@@ -630,6 +630,8 @@ 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;
 }
-- 
2.52.0