{"id":2196701,"url":"http://patchwork.ozlabs.org/api/1.0/patches/2196701/?format=json","project":{"id":2,"url":"http://patchwork.ozlabs.org/api/1.0/projects/2/?format=json","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powerpc64/bpf: do not increment tailcall count when prog is NULL","commit_ref":null,"pull_url":null,"state":"superseded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=json","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=json","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 ","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 spf=pass (sender SPF authorized) smtp.mailfrom=lists.ozlabs.org\n (client-ip=2404:9400:21b9:f100::1; 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<- 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"]}