[PATCH bpf-next 1/2] s390/bpf: Replace ly instruction with llgf

[Maxim Khmelevskii <max@linux.ibm.com>]

cpu_nr is a 32 bit value and BPF_REG_0 is a 64 bit register,
when ly loads the cpu_nr into BPF_REG_0 it does not zero the upper bits,
but llgf does.

Link: https://sashiko.dev/#/patchset/20260414142930.528751-1-max%40linux.ibm.com
Fixes: 9012cf2491e3 ("s390/bpf: Inline smp_processor_id and current_task")
Signed-off-by: Maxim Khmelevskii <max@linux.ibm.com>
Reviewed-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 arch/s390/net/bpf_jit_comp.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/net/bpf_jit_comp.c b/arch/s390/net/bpf_jit_comp.c
index 14eaaa5b2185..d62c5838c741 100644
--- a/arch/s390/net/bpf_jit_comp.c
+++ b/arch/s390/net/bpf_jit_comp.c
@@ -1783,8 +1783,8 @@ static noinline int bpf_jit_insn(struct bpf_jit *jit, struct bpf_prog *fp,
 		    insn->imm == BPF_FUNC_get_smp_processor_id) {
 			const u32 *cpu_nr = &get_lowcore()->cpu_nr;
 
-			/* ly %b0, cpu_nr */
-			EMIT6_DISP_LH(0xe3000000, 0x0058, BPF_REG_0, REG_0, REG_0,
+			/* llgf %b0, cpu_nr */
+			EMIT6_DISP_LH(0xe3000000, 0x0016, BPF_REG_0, REG_0, REG_0,
 				      (unsigned long)cpu_nr);
 			break;
 		}
-- 
2.54.0