Re: [PATCH 07/14] powerpc: Add support for restartable sequences

[Peter Zijlstra <peterz@infradead.org>]

On Mon, Apr 30, 2018 at 06:44:26PM -0400, Mathieu Desnoyers wrote:
> diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
> index c32a181a7cbb..ed21a777e8c6 100644
> --- a/arch/powerpc/Kconfig
> +++ b/arch/powerpc/Kconfig
> @@ -223,6 +223,7 @@ config PPC
>  	select HAVE_SYSCALL_TRACEPOINTS
>  	select HAVE_VIRT_CPU_ACCOUNTING
>  	select HAVE_IRQ_TIME_ACCOUNTING
> +	select HAVE_RSEQ
>  	select IRQ_DOMAIN
>  	select IRQ_FORCED_THREADING
>  	select MODULES_USE_ELF_RELA
> diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
> index 61db86ecd318..d3bb3aaaf5ac 100644
> --- a/arch/powerpc/kernel/signal.c
> +++ b/arch/powerpc/kernel/signal.c
> @@ -133,6 +133,8 @@ static void do_signal(struct task_struct *tsk)
>  	/* Re-enable the breakpoints for the signal stack */
>  	thread_change_pc(tsk, tsk->thread.regs);
>  
> +	rseq_signal_deliver(tsk->thread.regs);
> +
>  	if (is32) {
>          	if (ksig.ka.sa.sa_flags & SA_SIGINFO)
>  			ret = handle_rt_signal32(&ksig, oldset, tsk);
> @@ -164,6 +166,7 @@ void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)
>  	if (thread_info_flags & _TIF_NOTIFY_RESUME) {
>  		clear_thread_flag(TIF_NOTIFY_RESUME);
>  		tracehook_notify_resume(regs);
> +		rseq_handle_notify_resume(regs);
>  	}
>  
>  	user_enter();

Again no rseq_syscall().