Re: [PATCH v9 13/16] arm64: entry: Convert to generic entry

[Kevin Brodsky <kevin.brodsky@arm.com>]

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 <kevin.brodsky@arm.com>

> - Implement arch_syscall_is_vdso_sigreturn() to support "Syscall User
>   Dispatch".
>
> Suggested-by: Kevin Brodsky <kevin.brodsky@arm.com>
> Suggested-by: Mark Rutland <mark.rutland@arm.com>
> Signed-off-by: Jinjie Ruan <ruanjinjie@huawei.com>
>
> [...]