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Tue, 12 Aug 2025 14:12:18 +0000 (GMT) From: Ilya Leoshkevich To: Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko Cc: bpf@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Ilya Leoshkevich Subject: [PATCH bpf-next 0/2] s390/bpf: Write back the tail call counter Date: Tue, 12 Aug 2025 16:07:50 +0200 Message-ID: <20250812141217.144551-1-iii@linux.ibm.com> X-Mailer: git-send-email 2.50.1 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-Spam-Details-Enc: AW1haW4tMjUwODEyMDEzMyBTYWx0ZWRfX2FF4bUy8imn4 f4SBWnKduWyBmGwQf1zQtMD8CU8BXdm6fiBFsnRHqilWhERRFkTz2aH7DJIha3WyYZTmzAHLEBI sZHwr1vzKDtudpLcw0Swomci9JzTHJ1G5sEaYeFixFj/JxX5T/1pfXa0DcIalG2Xq0qIBaA+QyT HGvrbEN0lLEtUoaOG1WPdj3Myop8E4bYT8OO5FxzLFun9hydrqo96hYZU0/o21/vm9ay150TVwO +sDZa9nPo2qe+Gs0BX57mA/8IuOAr4hMthFMnKfelRXp8IjgtMrQ43PRx6X+1NR1wKGlxh0n41C W2DT2dbM9xCWEH+5+kIIy00MNZ18Gemy5DQjqc4gjc+fg+gW/JAyubMtfXkP1yMM/YwxUNc9YMk k81zFEVl+6szjDF5nZTV8HJcoAn3jhsshXejnV2FYc1z+ZT20Jh5ifv0zGf9OQZ/0VuWIerA X-Authority-Analysis: v=2.4 cv=GrpC+l1C c=1 sm=1 tr=0 ts=689b4bc8 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=2OwXVqhp2XgA:10 a=c4VwZEiHG4szvKHAD0gA:9 X-Proofpoint-GUID: Imc0u9zNIz80kmo4XN7zNbXWlBLUz4Ov X-Proofpoint-ORIG-GUID: Imc0u9zNIz80kmo4XN7zNbXWlBLUz4Ov X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-12_07,2025-08-11_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 suspectscore=0 phishscore=0 bulkscore=0 mlxlogscore=986 malwarescore=0 clxscore=1015 adultscore=0 mlxscore=0 spamscore=0 lowpriorityscore=0 priorityscore=1501 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508120133 Hi, This series fixes the tailcall_bpf2bpf_hierarchy test failures on s390. It takes a simpler approach than x86_64 and aarch64: instead of introducing a pointer to the tail call counter, it copies the updated value back from the callee's frame to the caller's frame. This needs to be done in two locations: after BPF_CALL and after BPF_TRAMP_F_CALL_ORIG. Best regards, Ilya Ilya Leoshkevich (2): s390/bpf: Write back the tail call counter for BPF_CALL s390/bpf: Write back the tail call counter for BPF_TRAMP_F_CALL_ORIG arch/s390/net/bpf_jit_comp.c | 23 ++++++++++++++++------- 1 file changed, 16 insertions(+), 7 deletions(-) -- 2.50.1