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s390: Introduce bpf_get_lowcore() kfunc

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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>
This commit is contained in:
Ilya Leoshkevich
2026-02-17 17:05:08 +01:00
committed by Alexei Starovoitov
parent 309d8808ee
commit 6fe54677bc
4 changed files with 21 additions and 0 deletions
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arch/s390/kernel/Makefile
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@@ -80,5 +80,7 @@ obj-$(CONFIG_PERF_EVENTS) += perf_pai.o
obj-$(CONFIG_TRACEPOINTS) += trace.o
obj-$(CONFIG_BPF_SYSCALL) += bpf.o
# vdso
obj-y += vdso/