linux.git/arch/s390/kernel/bpf.c, branch master Linux kernel source tree s390: Introduce bpf_get_lowcore() kfunc 2026-03-03T16:35:07+00:00 Ilya Leoshkevich iii@linux.ibm.com 2026-02-17T16:05:08+00:00 6fe54677bcc2e7a42f5fcaa3c66600232ba54d44 Implementing BPF version of preempt_count() requires accessing lowcore from BPF. Since lowcore can be relocated, open-coding (struct lowcore *)0 does not work, so add a kfunc. Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com> Link: https://lore.kernel.org/r/20260217160813.100855-2-iii@linux.ibm.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> 
Implementing BPF version of preempt_count() requires accessing lowcore
from BPF. Since lowcore can be relocated, open-coding
(struct lowcore *)0 does not work, so add a kfunc.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Link: https://lore.kernel.org/r/20260217160813.100855-2-iii@linux.ibm.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>