On 04/12/2025 09:21, Jinjie Ruan wrote:

Currently, x86, Riscv, Loongarch use the generic entry which makes
maintainers' work easier and codes more elegant. arm64 has already
switched to the generic IRQ entry, so completely convert arm64 to use
the generic entry infrastructure from kernel/entry/*.

The changes are below:
 - Remove TIF_SYSCALL_* flag.

 - Remove _TIF_SYSCALL_WORK and has_syscall_work(), as _TIF_SYSCALL_WORK
   is equal with SYSCALL_WORK_ENTER.

Should be updated considering patch 7 (has_syscall_work() no longer
exists and there is also _TIF_SYSCALL_EXIT_WORK).

 - Implement arch_ptrace_report_syscall_entry/exit() with
   report_syscall_entry/exit() to do arm64-specific save/restore
   during syscall entry/exit.

 - Add "ARCH_SYSCALL_WORK_EXIT" to be defined as "_TIF_SECCOMP |
   _TIF_SYSCALL_EMU" to keep the arm64 behaviour unchanged.

No longer the case.

 - Remove arm64 syscall_trace_enter(), syscall_exit_to_user_mode_prepare(),
   and related sub-functions including syscall_exit_work() and
   syscall_enter_audit(), by calling generic entry's functions with similar
   functionality.

Would be good to talk about SYSCALL_EXIT_TRAP as well.

Otherwise:

Reviewed-by: Kevin Brodsky <redacted>

- Implement arch_syscall_is_vdso_sigreturn() to support "Syscall User
  Dispatch".

Suggested-by: Kevin Brodsky <redacted>
Suggested-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Jinjie Ruan <redacted>

[...]