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| author | Mukesh Kumar Chaurasiya <mchauras@linux.ibm.com> | 2026-04-27 15:27:36 +0300 |
|---|---|---|
| committer | Madhavan Srinivasan <maddy@linux.ibm.com> | 2026-05-20 04:27:13 +0300 |
| commit | dec63ea6fafffb91811381d9a4686d4bc39f01ae (patch) | |
| tree | d0bead64e3e4cd6c121ac1568f4f986cf0a7a8eb | |
| parent | baa590018fbfc3e7384b604c7a7951eecf10a523 (diff) | |
| download | linux-dec63ea6fafffb91811381d9a4686d4bc39f01ae.tar.xz | |
powerpc: Prepare to build with generic entry/exit framework
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>
Tested-by: Samir M <samir@linux.ibm.com>
Tested-by: David Gow <davidgow@google.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20260427122742.210074-3-mkchauras@gmail.com
| -rw-r--r-- | arch/powerpc/include/asm/entry-common.h | 8 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/stacktrace.h | 6 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/syscall.h | 5 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/thread_info.h | 1 |
4 files changed, 20 insertions, 0 deletions
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 <asm/stacktrace.h> + +#endif /* _ASM_PPC_ENTRY_COMMON_H */ diff --git a/arch/powerpc/include/asm/stacktrace.h b/arch/powerpc/include/asm/stacktrace.h index 6149b53b3bc8..987f2e996262 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 __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 97f35f9b1a96..ee3b9adb5b67 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; |