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| author | Alexei Starovoitov <ast@kernel.org> | 2026-03-03 19:35:07 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-03-03 19:36:12 +0300 |
| commit | 74fef05ef11846515f4386d451b176ccb9e062b5 (patch) | |
| tree | ade91f9d2ca3f424da9d4f109db585845f79459f /tools | |
| parent | 309d8808eef93d29b65ae69241a4475b2c8bd6fe (diff) | |
| parent | 0f87614c4dbdd14bbcc23c69b09be58177ce7b9b (diff) | |
| download | linux-74fef05ef11846515f4386d451b176ccb9e062b5.tar.xz | |
Merge branch 'bpf-s390-implement-get_preempt_count'
Ilya Leoshkevich says:
====================
bpf/s390: Implement get_preempt_count()
This series adds get_preempt_count() BPF implementation for s390.
On s390 preempt_count lives in lowcore: a per-cpu data structure
mapped at virtual address 0 or 0x70000 depending on the kernel
command line.
Patch 1 adds a kfunc to obtain lowcore address.
Patch 2 is the implementation that delegates to it.
====================
Link: https://patch.msgid.link/20260217160813.100855-1-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/testing/selftests/bpf/bpf_experimental.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/bpf_experimental.h b/tools/testing/selftests/bpf/bpf_experimental.h index 9df77e59d4f5..44466acf8083 100644 --- a/tools/testing/selftests/bpf/bpf_experimental.h +++ b/tools/testing/selftests/bpf/bpf_experimental.h @@ -627,6 +627,10 @@ struct task_struct___preempt_rt { int softirq_disable_cnt; } __attribute__((preserve_access_index)); +#ifdef bpf_target_s390 +extern struct lowcore *bpf_get_lowcore(void) __weak __ksym; +#endif + static inline int get_preempt_count(void) { #if defined(bpf_target_x86) @@ -647,6 +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; } @@ -656,6 +662,7 @@ static inline int get_preempt_count(void) * * x86 * * arm64 * * powerpc64 + * * s390x */ static inline int bpf_in_interrupt(void) { @@ -676,6 +683,7 @@ static inline int bpf_in_interrupt(void) * * x86 * * arm64 * * powerpc64 + * * s390x */ static inline int bpf_in_nmi(void) { @@ -687,6 +695,7 @@ static inline int bpf_in_nmi(void) * * x86 * * arm64 * * powerpc64 + * * s390x */ static inline int bpf_in_hardirq(void) { @@ -698,6 +707,7 @@ static inline int bpf_in_hardirq(void) * * x86 * * arm64 * * powerpc64 + * * s390x */ static inline int bpf_in_serving_softirq(void) { @@ -717,6 +727,7 @@ static inline int bpf_in_serving_softirq(void) * * x86 * * arm64 * * powerpc64 + * * s390x */ static inline int bpf_in_task(void) { |