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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2026-02-17 19:05:08 +0300 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-03-03 19:35:07 +0300 |
| commit | 6fe54677bcc2e7a42f5fcaa3c66600232ba54d44 (patch) | |
| tree | ba956500a3e669fa3fd6e355cbccdb64f28d221d /arch | |
| parent | 309d8808eef93d29b65ae69241a4475b2c8bd6fe (diff) | |
| download | linux-6fe54677bcc2e7a42f5fcaa3c66600232ba54d44.tar.xz | |
s390: Introduce bpf_get_lowcore() kfunc
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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/s390/kernel/Makefile | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/bpf.c | 12 |
2 files changed, 14 insertions, 0 deletions
diff --git a/arch/s390/kernel/Makefile b/arch/s390/kernel/Makefile index 42c83d60d6fa..b522c6649fcc 100644 --- a/arch/s390/kernel/Makefile +++ b/arch/s390/kernel/Makefile @@ -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/ diff --git a/arch/s390/kernel/bpf.c b/arch/s390/kernel/bpf.c new file mode 100644 index 000000000000..713337fae626 --- /dev/null +++ b/arch/s390/kernel/bpf.c @@ -0,0 +1,12 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <asm/lowcore.h> +#include <linux/btf.h> + +__bpf_kfunc_start_defs(); + +__bpf_kfunc struct lowcore *bpf_get_lowcore(void) +{ + return get_lowcore(); +} + +__bpf_kfunc_end_defs(); |