From: Mukesh Kumar Chaurasiya <mkchauras@linux•ibm.com>
To: maddy@linux•ibm.com, mpe@ellerman•id.au, npiggin@gmail•com,
christophe.leroy@csgroup•eu, oleg@redhat•com, kees@kernel•org,
luto@amacapital•net, wad@chromium•org, mchauras@linux•ibm.com,
thuth@redhat•com, sshegde@linux•ibm.com,
akpm@linux-foundation•org, macro@orcam•me.uk, ldv@strace•io,
deller@gmx•de, charlie@rivosinc•com, bigeasy@linutronix•de,
segher@kernel•crashing.org, thomas.weissschuh@linutronix•de,
menglong8.dong@gmail•com, ankur.a.arora@oracle•com,
peterz@infradead•org, namcao@linutronix•de, tglx@linutronix•de,
kan.liang@linux•intel.com, mingo@kernel•org,
atrajeev@linux•vnet.ibm.com, mark.barnett@arm•com,
coltonlewis@google•com, rppt@kernel•org,
linuxppc-dev@lists•ozlabs.org, linux-kernel@vger•kernel.org
Subject: [PATCH 2/8] powerpc: Prepare to build with generic entry/exit framework
Date: Sun, 2 Nov 2025 17:23:52 +0530 [thread overview]
Message-ID: <20251102115358.1744304-3-mkchauras@linux.ibm.com> (raw)
In-Reply-To: <20251102115358.1744304-1-mkchauras@linux.ibm.com>
From: Mukesh Kumar Chaurasiya <mchauras@linux•ibm.com>
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_* flags.
- 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’s 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 <mchauras@linux•ibm.com>
---
arch/powerpc/include/asm/entry-common.h | 11 +++++++++++
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, 23 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..3af16d821d07
--- /dev/null
+++ b/arch/powerpc/include/asm/entry-common.h
@@ -0,0 +1,11 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+
+#ifndef _ASM_PPC_ENTRY_COMMON_H
+#define _ASM_PPC_ENTRY_COMMON_H
+
+#ifdef CONFIG_GENERIC_IRQ_ENTRY
+
+#include <asm/stacktrace.h>
+
+#endif /* CONFIG_GENERIC_IRQ_ENTRY */
+#endif /* _ASM_PPC_ENTRY_COMMON_H */
diff --git a/arch/powerpc/include/asm/stacktrace.h b/arch/powerpc/include/asm/stacktrace.h
index 6149b53b3bc8..a81a9373d723 100644
--- a/arch/powerpc/include/asm/stacktrace.h
+++ b/arch/powerpc/include/asm/stacktrace.h
@@ -10,4 +10,10 @@
void show_user_instructions(struct pt_regs *regs);
+static 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;
--
2.51.0
next prev parent reply other threads:[~2025-11-02 11:55 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-11-02 11:53 [PATCH 0/8] Generic IRQ entry/exit support for powerpc Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` [PATCH 1/8] powerpc: rename arch_irq_disabled_regs Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` Mukesh Kumar Chaurasiya [this message]
2025-11-02 11:53 ` [PATCH 3/8] powerpc: introduce arch_enter_from_user_mode Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` [PATCH 4/8] powerpc: Introduce syscall exit arch functions Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` [PATCH 5/8] powerpc: add exit_flags field in pt_regs Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` [PATCH 6/8] powerpc: Prepare for IRQ entry exit Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` [PATCH 7/8] powerpc: Enable IRQ generic entry/exit path Mukesh Kumar Chaurasiya
2025-11-02 11:53 ` [PATCH 8/8] powerpc: Enable Generic Entry/Exit for syscalls Mukesh Kumar Chaurasiya
2025-11-07 16:23 ` [PATCH 0/8] Generic IRQ entry/exit support for powerpc Shrikanth Hegde
2025-11-19 17:57 ` Thomas Gleixner
2025-11-21 5:48 ` Mukesh Kumar Chaurasiya
2025-11-10 9:12 ` Samir Alamshaha Mulani
2025-11-11 4:39 ` Samir M
2025-11-11 5:09 ` Samir M
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