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GET /api/1.0/patches/2196701/?format=api
{ "id": 2196701, "url": "http://patchwork.ozlabs.org/api/1.0/patches/2196701/?format=api", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.0/projects/2/?format=api", "name": "Linux PPC development", "link_name": "linuxppc-dev", "list_id": "linuxppc-dev.lists.ozlabs.org", "list_email": "linuxppc-dev@lists.ozlabs.org", "web_url": "https://github.com/linuxppc/wiki/wiki", "scm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git", "webscm_url": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/" }, "msgid": "<20260216065639.1750181-2-hbathini@linux.ibm.com>", "date": "2026-02-16T06:56:35", "name": "[1/5] powerpc64/bpf: do not increment tailcall count when prog is NULL", "commit_ref": null, "pull_url": null, "state": "superseded", "archived": false, "hash": "073c0beb6f76a96db7a0a6ce5aecfd6aa849f97d", "submitter": { "id": 74073, "url": "http://patchwork.ozlabs.org/api/1.0/people/74073/?format=api", "name": "Hari Bathini", "email": "hbathini@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260216065639.1750181-2-hbathini@linux.ibm.com/mbox/", "series": [ { "id": 492248, "url": "http://patchwork.ozlabs.org/api/1.0/series/492248/?format=api", "date": "2026-02-16T06:56:34", "name": "powerpc64/bpf: various fixes", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492248/mbox/" } ], "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196701/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-16869-incoming=patchwork.ozlabs.org@lists.ozlabs.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "linuxppc-dev@lists.ozlabs.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=ibm.com header.i=@ibm.com header.a=rsa-sha256\n header.s=pp1 header.b=R7Aj8pW8;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n 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d=ibm.com; h=cc\n\t:content-transfer-encoding:date:from:in-reply-to:message-id\n\t:mime-version:references:subject:to; s=pp1; bh=SqbmQjSg2GytVyMUk\n\ttvIGlVpWb4XNAQ3Gr5VMEULpHk=; b=R7Aj8pW8xguZDReRxRJDT9jZ8Nz4K6Vx9\n\t5knOXoA9NS94LA3K2/P8bri6BRS0t5DilpCq2XC3RVw/bztZZdmm7aI6q6QLFkpM\n\tC2lYNd7qO1QT24b4d/CZSE4yb4LHfRW5/KlXrQiKTxixbCgFNAHqAyx7W/bsPnXs\n\tayIkJ42H6zLv5NMqJtApt8qRmo81Mpq3lwDCiteYxr7/WRX1EuGu+8oNCv3NKX3R\n\tJtKJ2U1q5Z6794wLdnxdB4Sl/hCP/DEamVNYoEG9GceQg6Edd7KihfSfXWrV0u/T\n\tyHblgU6VvtKu8B504GP0jJ7mgVILkmBNcNhXgEoe4obRs/CzMw7RA==", "From": "Hari Bathini <hbathini@linux.ibm.com>", "To": "linuxppc-dev <linuxppc-dev@lists.ozlabs.org>", "Cc": "bpf@vger.kernel.org, Alexei Starovoitov <ast@kernel.org>,\n Daniel Borkmann <daniel@iogearbox.net>,\n Andrii Nakryiko <andrii@kernel.org>,\n Saket Kumar Bhaskar <skb99@linux.ibm.com>,\n Abhishek Dubey <adubey@linux.ibm.com>, stable@vger.kernel.org", "Subject": "[PATCH 1/5] powerpc64/bpf: do not increment tailcall count when prog\n is NULL", "Date": "Mon, 16 Feb 2026 12:26:35 +0530", "Message-ID": "<20260216065639.1750181-2-hbathini@linux.ibm.com>", "X-Mailer": "git-send-email 2.53.0", "In-Reply-To": "<20260216065639.1750181-1-hbathini@linux.ibm.com>", "References": "<20260216065639.1750181-1-hbathini@linux.ibm.com>", "X-Mailing-List": "linuxppc-dev@lists.ozlabs.org", "List-Id": "<linuxppc-dev.lists.ozlabs.org>", "List-Help": "<mailto:linuxppc-dev+help@lists.ozlabs.org>", "List-Owner": "<mailto:linuxppc-dev+owner@lists.ozlabs.org>", "List-Post": "<mailto:linuxppc-dev@lists.ozlabs.org>", "List-Archive": "<https://lore.kernel.org/linuxppc-dev/>,\n <https://lists.ozlabs.org/pipermail/linuxppc-dev/>", "List-Subscribe": "<mailto:linuxppc-dev+subscribe@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-digest@lists.ozlabs.org>,\n <mailto:linuxppc-dev+subscribe-nomail@lists.ozlabs.org>", "List-Unsubscribe": "<mailto:linuxppc-dev+unsubscribe@lists.ozlabs.org>", "Precedence": "list", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-TM-AS-GCONF": "00", "X-Authority-Analysis": "v=2.4 cv=E+/AZKdl c=1 sm=1 tr=0 ts=6992bfb0 cx=c_pps\n a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17\n a=HzLeVaNsDn8A:10 a=VkNPw1HP01LnGYTKEx00:22 a=Mpw57Om8IfrbqaoTuvik:22\n a=GgsMoib0sEa3-_RKJdDe:22 a=VwQbUJbxAAAA:8 a=VnNF1IyMAAAA:8\n a=JWpHT1DDrkih_aSkpakA:9", "X-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwMjE2MDA1NCBTYWx0ZWRfX/HSAjK9iOFCj\n VEvqWZ+pzy7LLOJ6e/xj6u/Hm6XjGqIYAjlBlxRYVwHwDq0JbUZDG6I/67njN9MfjwjWj/+9DRK\n +x8U1iIdAFMp2D7SYH3AF3C6euz6nb5jCZ0tyBcsMIpGnpcomGwV4vH10cBDqOKxsE6okpR0RZo\n jEJ2n/1HGWyiLNC6bMDIoHisEOPuY70Ik/dDBViDhZ1o1KqWMLtGy8Q9KH5Fodq1weaWs2qWkyh\n 4ZzlBvtKWbb8helSPd74csqLnX6NvoSLyPG1MjfazHRu25mrYl/1tm0KytUlWrDXA/ACkPdqaKG\n vFckRplusvctodewqudt5vDROT0FVlNu1xbl67DUrt9JJkfrDbOybnhBoF19ri/eAXdUdYbO+/J\n BXqzUWLx0EXhgK2FUbDS1J4vFvq24dIBapb17/fGsMQfro2YTlWzCuGezmHXc1uHugpJje2LBAi\n vLo+cLaZ+p1vhSjpbKA==", "X-Proofpoint-ORIG-GUID": "YXV6NMA-AT6bLW9E9Vkh0Z9oPlEu0R59", "X-Proofpoint-GUID": "YXV6NMA-AT6bLW9E9Vkh0Z9oPlEu0R59", "X-Proofpoint-Virus-Version": "vendor=baseguard\n engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-02-16_03,2026-02-13_01,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n lowpriorityscore=0 priorityscore=1501 malwarescore=0 phishscore=0 bulkscore=0\n suspectscore=0 spamscore=0 clxscore=1011 impostorscore=0 adultscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2601150000 definitions=main-2602160054", "X-Spam-Status": "No, score=-0.7 required=3.0 tests=DKIM_SIGNED,DKIM_VALID,\n\tRCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,\n\tSPF_PASS autolearn=disabled version=4.0.1 OzLabs 8", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "Do not increment tailcall count, if tailcall did not succeed due to\nmissing BPF program.\n\nFixes: ce0761419fae (\"powerpc/bpf: Implement support for tail calls\")\nCc: stable@vger.kernel.org\nSigned-off-by: Hari Bathini <hbathini@linux.ibm.com>\n---\n arch/powerpc/net/bpf_jit_comp64.c | 39 +++++++++++++++++--------------\n 1 file changed, 21 insertions(+), 18 deletions(-)", "diff": "diff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c\nindex b1a3945ccc9f..44ce8a8783f9 100644\n--- a/arch/powerpc/net/bpf_jit_comp64.c\n+++ b/arch/powerpc/net/bpf_jit_comp64.c\n@@ -522,9 +522,30 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o\n \n \t/*\n \t * tail_call_info++; <- Actual value of tcc here\n+\t * Writeback this updated value only if tailcall succeeds.\n \t */\n \tEMIT(PPC_RAW_ADDI(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), 1));\n \n+\t/* prog = array->ptrs[index]; */\n+\tEMIT(PPC_RAW_MULI(bpf_to_ppc(TMP_REG_2), b2p_index, 8));\n+\tEMIT(PPC_RAW_ADD(bpf_to_ppc(TMP_REG_2), bpf_to_ppc(TMP_REG_2), b2p_bpf_array));\n+\tEMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_2), bpf_to_ppc(TMP_REG_2),\n+\t\t\toffsetof(struct bpf_array, ptrs)));\n+\n+\t/*\n+\t * if (prog == NULL)\n+\t * goto out;\n+\t */\n+\tEMIT(PPC_RAW_CMPLDI(bpf_to_ppc(TMP_REG_2), 0));\n+\tPPC_BCC_SHORT(COND_EQ, out);\n+\n+\t/* goto *(prog->bpf_func + prologue_size); */\n+\tEMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_2), bpf_to_ppc(TMP_REG_2),\n+\t\t\toffsetof(struct bpf_prog, bpf_func)));\n+\tEMIT(PPC_RAW_ADDI(bpf_to_ppc(TMP_REG_2), bpf_to_ppc(TMP_REG_2),\n+\t\t\t FUNCTION_DESCR_SIZE + bpf_tailcall_prologue_size));\n+\tEMIT(PPC_RAW_MTCTR(bpf_to_ppc(TMP_REG_2)));\n+\n \t/*\n \t * Before writing updated tail_call_info, distinguish if current frame\n \t * is storing a reference to tail_call_info or actual tcc value in\n@@ -539,24 +560,6 @@ static int bpf_jit_emit_tail_call(u32 *image, struct codegen_context *ctx, u32 o\n \t/* Writeback updated value to tail_call_info */\n \tEMIT(PPC_RAW_STD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_2), 0));\n \n-\t/* prog = array->ptrs[index]; */\n-\tEMIT(PPC_RAW_MULI(bpf_to_ppc(TMP_REG_1), b2p_index, 8));\n-\tEMIT(PPC_RAW_ADD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), b2p_bpf_array));\n-\tEMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), offsetof(struct bpf_array, ptrs)));\n-\n-\t/*\n-\t * if (prog == NULL)\n-\t * goto out;\n-\t */\n-\tEMIT(PPC_RAW_CMPLDI(bpf_to_ppc(TMP_REG_1), 0));\n-\tPPC_BCC_SHORT(COND_EQ, out);\n-\n-\t/* goto *(prog->bpf_func + prologue_size); */\n-\tEMIT(PPC_RAW_LD(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1), offsetof(struct bpf_prog, bpf_func)));\n-\tEMIT(PPC_RAW_ADDI(bpf_to_ppc(TMP_REG_1), bpf_to_ppc(TMP_REG_1),\n-\t\t\tFUNCTION_DESCR_SIZE + bpf_tailcall_prologue_size));\n-\tEMIT(PPC_RAW_MTCTR(bpf_to_ppc(TMP_REG_1)));\n-\n \t/* tear down stack, restore NVRs, ... */\n \tbpf_jit_emit_common_epilogue(image, ctx);\n \n", "prefixes": [ "1/5" ] }