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Fri, 23 Jan 2026 07:39:55 GMT Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 9DF422004B; Fri, 23 Jan 2026 07:39:55 +0000 (GMT) Received: from smtpav04.fra02v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C594320043; Fri, 23 Jan 2026 07:39:49 +0000 (GMT) Received: from li-1a3e774c-28e4-11b2-a85c-acc9f2883e29.ibm.com.com (unknown [9.124.222.171]) by smtpav04.fra02v.mail.ibm.com (Postfix) with ESMTP; Fri, 23 Jan 2026 07:39:49 +0000 (GMT) From: Mukesh Kumar Chaurasiya To: maddy@linux.ibm.com, mpe@ellerman.id.au, npiggin@gmail.com, chleroy@kernel.org, ryabinin.a.a@gmail.com, glider@google.com, andreyknvl@gmail.com, dvyukov@google.com, vincenzo.frascino@arm.com, oleg@redhat.com, kees@kernel.org, luto@amacapital.net, wad@chromium.org, mchauras@linux.ibm.com, thuth@redhat.com, ruanjinjie@huawei.com, sshegde@linux.ibm.com, akpm@linux-foundation.org, charlie@rivosinc.com, deller@gmx.de, ldv@strace.io, macro@orcam.me.uk, segher@kernel.crashing.org, peterz@infradead.org, bigeasy@linutronix.de, namcao@linutronix.de, tglx@linutronix.de, mark.barnett@arm.com, linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, kasan-dev@googlegroups.com Subject: [PATCH v4 2/8] powerpc: Prepare to build with generic entry/exit framework Date: Fri, 23 Jan 2026 13:09:10 +0530 Message-ID: <20260123073916.956498-3-mkchauras@linux.ibm.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20260123073916.956498-1-mkchauras@linux.ibm.com> References: <20260123073916.956498-1-mkchauras@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: QFzIB8v5osvdoZ0BbGLVSG0g9IifkH2n X-Authority-Analysis: v=2.4 cv=LaIxKzfi c=1 sm=1 tr=0 ts=697325d1 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=-TJU0OSysTv48yDGXSgA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: uIZUXHrmeQnPdbkQ9oHd1eIwYKWxfSrG X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTIzMDA1NSBTYWx0ZWRfXwLKASYox5Xxp ccGuhy2n0WNj6J8qhjlvJpsqOUcVsjlqDLzuPJLxMnBfMeWZrf0By6bnRUIHAKeYRoaAUyGR+N8 z+/Xy8i7zKNY8f1eUHbFPmxeVabMJWQaHY/dxidcSi30ZcFux3rLrG+o6p9TbYbcdD5KT3NN/1b QOXD5KaG84ZuDMBDROu8MFrvI9+D0NwJ8boFYIbUeA7KkEwBEpSfynV8PAYhTOBtZVTd6bN9P27 l1V5llOXYHzYHl/7YGNqt0MHkNbhmwnKIgoLshJM3DyrLqcamqIrAQTuBsdqq0DCnWUcLEQI5HE zfahrRrcJZTx58DCAmD4skBsw9bDkSB4FiDcgif9sAH6jv6c0MhDwokn6CxvzyYA3YsMkO8pqda ncOta2GZN3iJJeqd4T9ZWeqppkpPmuKYbuJxMTAbTVG9rwWmn78FbBGD1AGQevxGhsPRZJrm4ht YBMCd4MfQexvGOnnGRw== X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.20,FMLib:17.12.100.49 definitions=2026-01-22_06,2026-01-22_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 adultscore=0 phishscore=0 priorityscore=1501 lowpriorityscore=0 suspectscore=0 clxscore=1015 impostorscore=0 spamscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2601150000 definitions=main-2601230055 From: Mukesh Kumar Chaurasiya This patch introduces preparatory changes needed to support building PowerPC with the generic entry/exit (irqentry) framework. The following infrastructure updates are added: - Add a syscall_work field to struct thread_info to hold SYSCALL_WORK_* fl= ags. - Provide a stub implementation of arch_syscall_is_vdso_sigreturn(), returning false for now. - Introduce on_thread_stack() helper to detect if the current stack pointer lies within the task=E2=80=99s kernel stack. These additions enable later integration with the generic entry/exit infrastructure while keeping existing PowerPC behavior unchanged. No functional change is intended in this patch. Signed-off-by: Mukesh Kumar Chaurasiya --- arch/powerpc/include/asm/entry-common.h | 8 ++++++++ arch/powerpc/include/asm/stacktrace.h | 6 ++++++ arch/powerpc/include/asm/syscall.h | 5 +++++ arch/powerpc/include/asm/thread_info.h | 1 + 4 files changed, 20 insertions(+) create mode 100644 arch/powerpc/include/asm/entry-common.h diff --git a/arch/powerpc/include/asm/entry-common.h b/arch/powerpc/include= /asm/entry-common.h new file mode 100644 index 000000000000..05ce0583b600 --- /dev/null +++ b/arch/powerpc/include/asm/entry-common.h @@ -0,0 +1,8 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _ASM_PPC_ENTRY_COMMON_H +#define _ASM_PPC_ENTRY_COMMON_H + +#include + +#endif /* _ASM_PPC_ENTRY_COMMON_H */ diff --git a/arch/powerpc/include/asm/stacktrace.h b/arch/powerpc/include/a= sm/stacktrace.h index 6149b53b3bc8..987f2e996262 100644 --- a/arch/powerpc/include/asm/stacktrace.h +++ b/arch/powerpc/include/asm/stacktrace.h @@ -10,4 +10,10 @@ =20 void show_user_instructions(struct pt_regs *regs); =20 +static __always_inline bool on_thread_stack(void) +{ + return !(((unsigned long)(current->stack) ^ current_stack_pointer) + & ~(THREAD_SIZE - 1)); +} + #endif /* _ASM_POWERPC_STACKTRACE_H */ diff --git a/arch/powerpc/include/asm/syscall.h b/arch/powerpc/include/asm/= syscall.h index 4b3c52ed6e9d..834fcc4f7b54 100644 --- a/arch/powerpc/include/asm/syscall.h +++ b/arch/powerpc/include/asm/syscall.h @@ -139,4 +139,9 @@ static inline int syscall_get_arch(struct task_struct *= task) else return AUDIT_ARCH_PPC64; } + +static inline bool arch_syscall_is_vdso_sigreturn(struct pt_regs *regs) +{ + return false; +} #endif /* _ASM_SYSCALL_H */ diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/= asm/thread_info.h index b0f200aba2b3..9c8270354f0b 100644 --- a/arch/powerpc/include/asm/thread_info.h +++ b/arch/powerpc/include/asm/thread_info.h @@ -57,6 +57,7 @@ struct thread_info { #ifdef CONFIG_SMP unsigned int cpu; #endif + unsigned long syscall_work; /* SYSCALL_WORK_ flags */ unsigned long local_flags; /* private flags for thread */ #ifdef CONFIG_LIVEPATCH_64 unsigned long *livepatch_sp; --=20 2.52.0