Subject: Re: [PATCH v2] selftests/bpf: Add powerpc support for get_preempt_count() in selftest

From: Yonghong Song <[email-masked]>
Date: Thu, 12 Feb 2026 15:52:01 -0800

On 2/12/26 1:25 AM, Saket Kumar Bhaskar wrote:
> get_preempt_count() is enabled to return preempt_count for powerpc,
> so that bpf_in_interrupt()/bpf_in_nmi()/bpf_in_serving_softirq()/
> bpf_in_task()/bpf_in_hardirq()/get_preempt_count() works for
> powerpc as well.
>
> Signed-off-by: Saket Kumar Bhaskar <[email-masked]>
> ---
> Changes since v1:
> * Updated the comments to include powerpc for the APIs.
>
> v1: https://lore.kernel.org/bpf/[email-masked]/
> ---
>   tools/testing/selftests/bpf/bpf_experimental.h | 7 +++++++
>   1 file changed, 7 insertions(+)
>
> diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h
> index 4b7210c318dd..9df77e59d4f5 100644
> --- a/tools/testing/selftests/bpf/bpf_experimental.h
> +++ b/tools/testing/selftests/bpf/bpf_experimental.h
> @@ -645,6 +645,8 @@ static inline int get_preempt_count(void)
>   			bpf_this_cpu_ptr(&pcpu_hot))->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

Maybe do
   #elif defined(bpf_target_arm64) || defined(bpf_target_powerpc)
?

>   	return 0;
>   }
> @@ -653,6 +655,7 @@ static inline int get_preempt_count(void)
>    *	Report whether it is in interrupt context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_interrupt(void)
>   {
> @@ -672,6 +675,7 @@ static inline int bpf_in_interrupt(void)
>    *	Report whether it is in NMI context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_nmi(void)
>   {
> @@ -682,6 +686,7 @@ static inline int bpf_in_nmi(void)
>    *	Report whether it is in hard IRQ context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_hardirq(void)
>   {
> @@ -692,6 +697,7 @@ static inline int bpf_in_hardirq(void)
>    *	Report whether it is in softirq context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_serving_softirq(void)
>   {
> @@ -710,6 +716,7 @@ static inline int bpf_in_serving_softirq(void)
>    *	Report whether it is in task context. Only works on the following archs:
>    *	* x86
>    *	* arm64
> + *	* powerpc64
>    */
>   static inline int bpf_in_task(void)
>   {