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>

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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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2

arch/s390/kernel/Makefile

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12

arch/s390/kernel/bpf.c

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3

kernel/bpf/helpers.c

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4

tools/testing/selftests/bpf/bpf_experimental.h

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