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GET /api/1.1/patches/2228804/?format=api
{ "id": 2228804, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2228804/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260427122742.210074-6-mkchauras@gmail.com/", "project": { "id": 2, "url": "http://patchwork.ozlabs.org/api/1.1/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": "<20260427122742.210074-6-mkchauras@gmail.com>", "date": "2026-04-27T12:27:39", "name": "[v5,5/8] powerpc: add exit_flags field in pt_regs", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "e5dbf96ff0e882ebf74c2cb45d0ec42538bebe10", "submitter": { "id": 92575, "url": "http://patchwork.ozlabs.org/api/1.1/people/92575/?format=api", "name": "Mukesh Kumar Chaurasiya", "email": "mkchauras@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/linuxppc-dev/patch/20260427122742.210074-6-mkchauras@gmail.com/mbox/", "series": [ { "id": 501638, "url": "http://patchwork.ozlabs.org/api/1.1/series/501638/?format=api", "web_url": "http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=501638", "date": "2026-04-27T12:27:34", "name": "Generic IRQ entry/exit support for powerpc", "version": 5, "mbox": "http://patchwork.ozlabs.org/series/501638/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2228804/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2228804/checks/", "tags": {}, "headers": { "Return-Path": "\n <linuxppc-dev+bounces-20164-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=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=VrJvvZj9;\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; 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This field will hold\nthe flags set during interrupt or syscall execution that are required during\nexit to user mode.\n\nSpecifically, the `TIF_RESTOREALL` flag, stored in this field, helps the\nexit routine determine if any NVGPRs were modified and need to be restored\nbefore returning to userspace.\n\nThis addition ensures a clean and architecture-specific mechanism to track\nper-syscall or per-interrupt state transitions related to register restore.\n\nChanges:\n - Add `exit_flags` and `__pt_regs_pad` to maintain 16-byte stack alignment\n - Update asm-offsets.c and ptrace.c for offset and validation\n - Update PT_* constants in uapi header to reflect the new layout\n\nSigned-off-by: Mukesh Kumar Chaurasiya <mchauras@linux.ibm.com>\nTested-by: Samir M <samir@linux.ibm.com>\nTested-by: David Gow <davidgow@google.com>\nTested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>\nReviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>\n---\n arch/powerpc/include/asm/ptrace.h | 3 +++\n arch/powerpc/include/uapi/asm/ptrace.h | 14 +++++++++-----\n arch/powerpc/kernel/ptrace/ptrace.c | 1 +\n 3 files changed, 13 insertions(+), 5 deletions(-)", "diff": "diff --git a/arch/powerpc/include/asm/ptrace.h b/arch/powerpc/include/asm/ptrace.h\nindex 94aa1de2b06e..2e741ea57b80 100644\n--- a/arch/powerpc/include/asm/ptrace.h\n+++ b/arch/powerpc/include/asm/ptrace.h\n@@ -53,6 +53,9 @@ struct pt_regs\n \t\t\t\tunsigned long esr;\n \t\t\t};\n \t\t\tunsigned long result;\n+\t\t\tunsigned long exit_flags;\n+\t\t\t/* Maintain 16 byte interrupt stack alignment */\n+\t\t\tunsigned long __pt_regs_pad[3];\n \t\t};\n \t};\n #if defined(CONFIG_PPC64) || defined(CONFIG_PPC_KUAP)\ndiff --git a/arch/powerpc/include/uapi/asm/ptrace.h b/arch/powerpc/include/uapi/asm/ptrace.h\nindex 01e630149d48..a393b7f2760a 100644\n--- a/arch/powerpc/include/uapi/asm/ptrace.h\n+++ b/arch/powerpc/include/uapi/asm/ptrace.h\n@@ -55,6 +55,8 @@ struct pt_regs\n \tunsigned long dar;\t\t/* Fault registers */\n \tunsigned long dsisr;\t\t/* on 4xx/Book-E used for ESR */\n \tunsigned long result;\t\t/* Result of a system call */\n+\tunsigned long exit_flags;\t/* System call exit flags */\n+\tunsigned long __pt_regs_pad[3];\t/* Maintain 16 byte interrupt stack alignment */\n };\n \n #endif /* __ASSEMBLER__ */\n@@ -114,10 +116,12 @@ struct pt_regs\n #define PT_DAR\t41\n #define PT_DSISR 42\n #define PT_RESULT 43\n-#define PT_DSCR 44\n-#define PT_REGS_COUNT 44\n+#define PT_EXIT_FLAGS 44\n+#define PT_PAD 47 /* 3 times */\n+#define PT_DSCR 48\n+#define PT_REGS_COUNT 48\n \n-#define PT_FPR0\t48\t/* each FP reg occupies 2 slots in this space */\n+#define PT_FPR0\t(PT_REGS_COUNT + 4)\t/* each FP reg occupies 2 slots in this space */\n \n #ifndef __powerpc64__\n \n@@ -129,7 +133,7 @@ struct pt_regs\n #define PT_FPSCR (PT_FPR0 + 32)\t/* each FP reg occupies 1 slot in 64-bit space */\n \n \n-#define PT_VR0 82\t/* each Vector reg occupies 2 slots in 64-bit */\n+#define PT_VR0\t(PT_FPSCR + 2)\t/* <82> each Vector reg occupies 2 slots in 64-bit */\n #define PT_VSCR (PT_VR0 + 32*2 + 1)\n #define PT_VRSAVE (PT_VR0 + 33*2)\n \n@@ -137,7 +141,7 @@ struct pt_regs\n /*\n * Only store first 32 VSRs here. The second 32 VSRs in VR0-31\n */\n-#define PT_VSR0 150\t/* each VSR reg occupies 2 slots in 64-bit */\n+#define PT_VSR0\t(PT_VRSAVE + 2)\t/* each VSR reg occupies 2 slots in 64-bit */\n #define PT_VSR31 (PT_VSR0 + 2*31)\n #endif /* __powerpc64__ */\n \ndiff --git a/arch/powerpc/kernel/ptrace/ptrace.c b/arch/powerpc/kernel/ptrace/ptrace.c\nindex c6997df63287..2134b6d155ff 100644\n--- a/arch/powerpc/kernel/ptrace/ptrace.c\n+++ b/arch/powerpc/kernel/ptrace/ptrace.c\n@@ -432,6 +432,7 @@ void __init pt_regs_check(void)\n \tCHECK_REG(PT_DAR, dar);\n \tCHECK_REG(PT_DSISR, dsisr);\n \tCHECK_REG(PT_RESULT, result);\n+\tCHECK_REG(PT_EXIT_FLAGS, exit_flags);\n \t#undef CHECK_REG\n \n \tBUILD_BUG_ON(PT_REGS_COUNT != sizeof(struct user_pt_regs) / sizeof(unsigned long));\n", "prefixes": [ "v5", "5/8" ] }