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Fri, 3 Jul 2026 12:56:59 +0000 (GMT) From: Maxim Khmelevskii To: Alexei Starovoitov , Andrii Nakryiko , Daniel Borkmann Cc: bpf@vger.kernel.org, Ilya Leoshkevich , Heiko Carstens , Vasily Gorbik , Alexander Gordeev Subject: [PATCH bpf-next 1/2] s390/bpf: Replace ly instruction with llgf Date: Fri, 3 Jul 2026 14:51:35 +0200 Message-ID: <20260703125648.919196-5-max@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260703125648.919196-4-max@linux.ibm.com> References: <20260703125648.919196-4-max@linux.ibm.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: lyr7KLse1xUUqdOVWmybvem5t1NJriMd X-Proofpoint-Spam-Info: AW1haW4tMjYwNzAzMDEyNiBTYWx0ZWRfXxe8vcWAdfLcg QUhbab4lJ+qbXQCxfDqShclRm7A7PELBbKs8/BCtH1Ra++S+brs9OrClbsUAsktZir8d0oFBM3p Lan41P92qnvIx03ZAu7y6d5XNepgmCw= X-Authority-Analysis: v=2.4 cv=edsNubEH c=1 sm=1 tr=0 ts=6a47b1a0 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=c92rfblmAAAA:8 a=VnNF1IyMAAAA:8 a=50wamhQsRirIyYOn3_4A:9 a=GvGzcOZaWPEFPQC_NcjD:22 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzAzMDEyNiBTYWx0ZWRfXwKHlpNCFKdnz AKM31MswpjPgWIJwcQ6AHmML9eesOAbh64R0y7O49tYumIxgLTeP39OvKpKZz5VmTnq+nC0KXv5 c1df8Qexs2nBq5Wm0ceXY+V6LER61vs9DsBAQ3JadL9mb1HUwoXXgs/edI38fHH0GLP7a4/ea+O 4yKW9bedGlVBP6fkBQVfHHjaV+61tJNtyQbIwmDJYKErQ+u6zzk4cDxoobxW+1is2WrP56TR+X9 FBLIzdZ7PryMzUE7noWOvc6YRFeio8i7fhOYB09iowK4IKxW1m5U0U3CkvYki4mpltn024qApdP jYdsRfSMvKxEVy1dkjFvk38Ok3OyjK3coTypAqAoCpCzOA6oTqgMwN12JVNjJcQOKQgG1ezpCQ5 UJTaW+7UDUVQsZuFe8VG8arF/Y9oqP24IhCUCfIg5hBpyqheRcGXoqDLeDvBDeOyZefkukLz46r +3U+Gp4jneobZTxZbNg== X-Proofpoint-ORIG-GUID: lyr7KLse1xUUqdOVWmybvem5t1NJriMd X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-07-03_02,2026-06-26_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 adultscore=0 impostorscore=0 bulkscore=0 spamscore=0 suspectscore=0 clxscore=1011 lowpriorityscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607030126 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 Reviewed-by: Ilya Leoshkevich --- 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