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GET /api/patches/2222433/?format=api
{ "id": 2222433, "url": "http://patchwork.ozlabs.org/api/patches/2222433/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260411221413.44304-2-adubey@linux.ibm.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/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/", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/", "list_archive_url_format": "https://lore.kernel.org/linuxppc-dev/{}/", "commit_url_format": "https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git/commit/?id={}" }, "msgid": "<20260411221413.44304-2-adubey@linux.ibm.com>", "list_archive_url": "https://lore.kernel.org/linuxppc-dev/20260411221413.44304-2-adubey@linux.ibm.com/", "date": "2026-04-11T22:14:09", "name": "[v3,1/5] powerpc/bpf: fix alignment of long branch trampoline address", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "ef43cd02ae18e59552b82acc92aab74e257541d4", "submitter": { "id": 88541, "url": "http://patchwork.ozlabs.org/api/people/88541/?format=api", "name": "adubey", "email": "adubey@linux.ibm.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260411221413.44304-2-adubey@linux.ibm.com/mbox/", "series": [ { "id": 499569, "url": "http://patchwork.ozlabs.org/api/series/499569/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=499569", "date": "2026-04-11T22:14:08", "name": "powerpc/bpf: Add support for verifier selftest", "version": 3, "mbox": "http://patchwork.ozlabs.org/series/499569/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222433/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222433/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <linuxppc-dev+bounces-19649-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=B71b5cIa;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=112.213.38.117; helo=lists.ozlabs.org;\n envelope-from=linuxppc-dev+bounces-19649-incoming=patchwork.ozlabs.org@lists.ozlabs.org;\n receiver=patchwork.ozlabs.org)", "lists.ozlabs.org;\n arc=none smtp.remote-ip=148.163.158.5", "lists.ozlabs.org;\n dmarc=pass (p=none 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bh=okqET8qXffFn3bcT7\n\t7J1rirq+BLrIQ84Y4jERf3WtP4=; b=B71b5cIarCnjoWDaUcL0rvwNzVo2xXF1q\n\tWMBJX+ijFJDL/CBsQCOkGAQRh6rMWojrUknZCoMP4G5vI22hmDadq0gkQ4O5Y71P\n\tx5xvxU1IgeUfw1b9MwEvQwPpwrw4gcY26FRW2s1RiFono3Shn+dCoufto5TlfQRq\n\tND1BMo76rm6kFtrjTfapxGa4jmhG8D6A/FYBYPlZVew1il/H89dikd8VHxoSNtCt\n\tSj4xDfh/oowrAxoBCH2RgJNEwJAcrGCDvWN+u4a3S9qs3FPQh5++W+gCDaQ/F8P6\n\tecViXUxRBjtT0qq/f+PPtR5z96ajxd080g7QZ4MkuWeMM071/XKoQ==", "From": "adubey@linux.ibm.com", "To": "bpf@vger.kernel.org", "Cc": "hbathini@linux.ibm.com, linuxppc-dev@lists.ozlabs.org,\n maddy@linux.ibm.com,\n ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net,\n shuah@kernel.org, linux-kselftest@vger.kernel.org,\n stable@vger.kernel.org, Abhishek Dubey <adubey@linux.ibm.com>", "Subject": "[PATCH v3 1/5] powerpc/bpf: fix alignment of long branch trampoline\n address", "Date": "Sat, 11 Apr 2026 18:14:09 -0400", "Message-ID": "<20260411221413.44304-2-adubey@linux.ibm.com>", "X-Mailer": "git-send-email 2.52.0", "In-Reply-To": "<20260411221413.44304-1-adubey@linux.ibm.com>", "References": "<20260411221413.44304-1-adubey@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-Proofpoint-Spam-Details-Enc": "AW1haW4tMjYwNDExMDE1NyBTYWx0ZWRfXxyhoLYSo2DWk\n 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engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49\n definitions=2026-04-11_05,2026-04-09_02,2025-10-01_01", "X-Proofpoint-Spam-Details": "rule=outbound_notspam policy=outbound score=0\n spamscore=0 adultscore=0 priorityscore=1501 lowpriorityscore=0 clxscore=1015\n impostorscore=0 bulkscore=0 malwarescore=0 suspectscore=0 phishscore=0\n classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0\n reason=mlx scancount=1 engine=8.22.0-2604010000 definitions=main-2604110157", "X-Spam-Status": "No, score=1.7 required=3.0 tests=DATE_IN_FUTURE_03_06,\n\tDKIM_SIGNED,DKIM_VALID,RCVD_IN_DNSWL_LOW,RCVD_IN_MSPIKE_H4,\n\tRCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_PASS autolearn=disabled\n\tversion=4.0.1 OzLabs 8", "X-Spam-Level": "*", "X-Spam-Checker-Version": "SpamAssassin 4.0.1 (2024-03-25) on lists.ozlabs.org" }, "content": "From: Abhishek Dubey <adubey@linux.ibm.com>\n\nEnsure the dummy trampoline address field present between the OOL stub\nand the long branch stub is 8-byte aligned, for memory compatibility\nwhen content loaded to a register.\n\nReported-by: Hari Bathini <hbathini@linux.ibm.com>\nFixes: d243b62b7bd3 (\"powerpc64/bpf: Add support for bpf trampolines\")\nCc: stable@vger.kernel.org\nSigned-off-by: Abhishek Dubey <adubey@linux.ibm.com>\n---\n arch/powerpc/net/bpf_jit.h | 4 ++--\n arch/powerpc/net/bpf_jit_comp.c | 34 ++++++++++++++++++++++++++-----\n arch/powerpc/net/bpf_jit_comp64.c | 4 ++--\n 3 files changed, 33 insertions(+), 9 deletions(-)", "diff": "diff --git a/arch/powerpc/net/bpf_jit.h b/arch/powerpc/net/bpf_jit.h\nindex 7354e1d72f79..1184ad15d5a4 100644\n--- a/arch/powerpc/net/bpf_jit.h\n+++ b/arch/powerpc/net/bpf_jit.h\n@@ -208,8 +208,8 @@ int bpf_jit_emit_func_call_rel(u32 *image, u32 *fimage, struct codegen_context *\n int bpf_jit_build_body(struct bpf_prog *fp, u32 *image, u32 *fimage, struct codegen_context *ctx,\n \t\t u32 *addrs, int pass, bool extra_pass);\n void bpf_jit_build_prologue(u32 *image, struct codegen_context *ctx);\n-void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx);\n-void bpf_jit_build_fentry_stubs(u32 *image, struct codegen_context *ctx);\n+void bpf_jit_build_epilogue(u32 *image, u32 *fimage, struct codegen_context *ctx);\n+void bpf_jit_build_fentry_stubs(u32 *image, u32 *fimage, struct codegen_context *ctx);\n void bpf_jit_realloc_regs(struct codegen_context *ctx);\n int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg, long exit_addr);\n \ndiff --git a/arch/powerpc/net/bpf_jit_comp.c b/arch/powerpc/net/bpf_jit_comp.c\nindex a62a9a92b7b5..c255b30a37b0 100644\n--- a/arch/powerpc/net/bpf_jit_comp.c\n+++ b/arch/powerpc/net/bpf_jit_comp.c\n@@ -49,11 +49,34 @@ asm (\n \"\t.popsection\t\t\t\t;\"\n );\n \n-void bpf_jit_build_fentry_stubs(u32 *image, struct codegen_context *ctx)\n+void bpf_jit_build_fentry_stubs(u32 *image, u32 *fimage, struct codegen_context *ctx)\n {\n \tint ool_stub_idx, long_branch_stub_idx;\n \n \t/*\n+\t * In the final pass, align the mis-aligned dummy_tramp_addr field\n+\t * in the fimage. The alignment NOP must appear before OOL stub,\n+\t * to make ool_stub_idx & long_branch_stub_idx constant from end.\n+\t *\n+\t * Need alignment NOP in following conditions:\n+\t *\n+\t * OOL stub aligned\tCONFIG_PPC_FTRACE_OUT_OF_LINE\tAlignment NOP\n+\t * Y Y N\n+\t * Y N Y\n+\t * N Y Y\n+\t * N N N\n+\t */\n+#ifdef CONFIG_PPC64\n+\tif (fimage && image) {\n+\t\tunsigned long pc = (unsigned long)fimage + CTX_NIA(ctx);\n+\n+\t\tif (IS_ALIGNED(pc, 8) ^\n+\t\t\tIS_ENABLED(CONFIG_PPC_FTRACE_OUT_OF_LINE))\n+\t\t\tEMIT(PPC_RAW_NOP());\n+\t}\n+#endif\n+\n+\t/* nop // optional, for alignment of dummy_tramp_addr\n \t * Out-of-line stub:\n \t *\tmflr\tr0\n \t *\t[b|bl]\ttramp\n@@ -70,7 +93,7 @@ void bpf_jit_build_fentry_stubs(u32 *image, struct codegen_context *ctx)\n \n \t/*\n \t * Long branch stub:\n-\t *\t.long\t<dummy_tramp_addr>\n+\t *\t.long\t<dummy_tramp_addr> // 8-byte aligned\n \t *\tmflr\tr11\n \t *\tbcl\t20,31,$+4\n \t *\tmflr\tr12\n@@ -81,6 +104,7 @@ void bpf_jit_build_fentry_stubs(u32 *image, struct codegen_context *ctx)\n \t */\n \tif (image)\n \t\t*((unsigned long *)&image[ctx->idx]) = (unsigned long)dummy_tramp;\n+\n \tctx->idx += SZL / 4;\n \tlong_branch_stub_idx = ctx->idx;\n \tEMIT(PPC_RAW_MFLR(_R11));\n@@ -107,7 +131,7 @@ int bpf_jit_emit_exit_insn(u32 *image, struct codegen_context *ctx, int tmp_reg,\n \t\tPPC_JMP(ctx->alt_exit_addr);\n \t} else {\n \t\tctx->alt_exit_addr = ctx->idx * 4;\n-\t\tbpf_jit_build_epilogue(image, ctx);\n+\t\tbpf_jit_build_epilogue(image, NULL, ctx);\n \t}\n \n \treturn 0;\n@@ -240,7 +264,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)\n \t */\n \tbpf_jit_build_prologue(NULL, &cgctx);\n \taddrs[fp->len] = cgctx.idx * 4;\n-\tbpf_jit_build_epilogue(NULL, &cgctx);\n+\tbpf_jit_build_epilogue(NULL, NULL, &cgctx);\n \n \tfixup_len = fp->aux->num_exentries * BPF_FIXUP_LEN * 4;\n \textable_len = fp->aux->num_exentries * sizeof(struct exception_table_entry);\n@@ -275,7 +299,7 @@ struct bpf_prog *bpf_int_jit_compile(struct bpf_prog *fp)\n \t\t\tfp = org_fp;\n \t\t\tgoto out_addrs;\n \t\t}\n-\t\tbpf_jit_build_epilogue(code_base, &cgctx);\n+\t\tbpf_jit_build_epilogue(code_base, fcode_base, &cgctx);\n \n \t\tif (bpf_jit_enable > 1)\n \t\t\tpr_info(\"Pass %d: shrink = %d, seen = 0x%x\\n\", pass,\ndiff --git a/arch/powerpc/net/bpf_jit_comp64.c b/arch/powerpc/net/bpf_jit_comp64.c\nindex c5e26d231cd5..d4873979ae9d 100644\n--- a/arch/powerpc/net/bpf_jit_comp64.c\n+++ b/arch/powerpc/net/bpf_jit_comp64.c\n@@ -348,7 +348,7 @@ static void bpf_jit_emit_common_epilogue(u32 *image, struct codegen_context *ctx\n \t}\n }\n \n-void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)\n+void bpf_jit_build_epilogue(u32 *image, u32 *fimage, struct codegen_context *ctx)\n {\n \tbpf_jit_emit_common_epilogue(image, ctx);\n \n@@ -357,7 +357,7 @@ void bpf_jit_build_epilogue(u32 *image, struct codegen_context *ctx)\n \n \tEMIT(PPC_RAW_BLR());\n \n-\tbpf_jit_build_fentry_stubs(image, ctx);\n+\tbpf_jit_build_fentry_stubs(image, fimage, ctx);\n }\n \n /*\n", "prefixes": [ "v3", "1/5" ] }