Re: [PATCH] selftests/bpf: Add powerpc support for get_preempt_count() in selftest

Venkat Rao Bagalkote
2026-01-30T07:43:26Z

On 29/01/26 11:10 am, Saket Kumar Bhaskar wrote:
> 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@linux.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;
> }

Tested this patch by applying on mainline kernel and it passes the below
selftest.

./test_progs -t timer_interrupt
#481     timer_interrupt:OK
Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED

Please add below tag.

Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>

Regards,

Venkat.