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bpf/s390: Implement get_preempt_count()

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exe_ctx test fails on s390, because get_preempt_count() is not
implemented and its fallback path always returns 0. Implement it
using the new bpf_get_lowcore() kfunc.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20260217160813.100855-3-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Ilya Leoshkevich 2026-02-17 17:05:09 +01:00 committed by Alexei Starovoitov
parent 6fe54677bc
commit 0f87614c4d
1 changed files with 7 additions and 0 deletions
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7
tools/testing/selftests/bpf/bpf_experimental.h
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@ -651,6 +651,8 @@ static inline int get_preempt_count(void)
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;
#elif defined(bpf_target_s390)
return bpf_get_lowcore()->preempt_count;
#endif
return 0;
}
@ -660,6 +662,7 @@ static inline int get_preempt_count(void)
* * x86
* * arm64
* * powerpc64
* * s390x
*/
static inline int bpf_in_interrupt(void)
{
@ -680,6 +683,7 @@ static inline int bpf_in_interrupt(void)
* * x86
* * arm64
* * powerpc64
* * s390x
*/
static inline int bpf_in_nmi(void)
{
@ -691,6 +695,7 @@ static inline int bpf_in_nmi(void)
* * x86
* * arm64
* * powerpc64
* * s390x
*/
static inline int bpf_in_hardirq(void)
{
@ -702,6 +707,7 @@ static inline int bpf_in_hardirq(void)
* * x86
* * arm64
* * powerpc64
* * s390x
*/
static inline int bpf_in_serving_softirq(void)
{
@ -721,6 +727,7 @@ static inline int bpf_in_serving_softirq(void)
* * x86
* * arm64
* * powerpc64
* * s390x
*/
static inline int bpf_in_task(void)
{