[PATCH] riscv: add support for TIF_NOTIFY_SIGNAL

[Jens Axboe]

Gentle nudge on this one.

On 10/29/20 10:20 AM, Jens Axboe wrote:
> Wire up TIF_NOTIFY_SIGNAL handling for riscv.
> 
> Cc: linux-riscv at lists.infradead.org
> Signed-off-by: Jens Axboe <axboe at kernel.dk>
> ---
> 
> 5.11 has support queued up for TIF_NOTIFY_SIGNAL, see this posting
> for details:
> 
> https://lore.kernel.org/io-uring/20201026203230.386348-1-axboe@kernel.dk/
> 
> As part of that work, I'm adding TIF_NOTIFY_SIGNAL support to all archs,
> as that will enable a set of cleanups once all of them support it. I'm
> happy carrying this patch if need be, or it can be funelled through the
> arch tree. Let me know.
> 
>  arch/riscv/include/asm/thread_info.h | 5 ++++-
>  arch/riscv/kernel/signal.c           | 2 +-
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/riscv/include/asm/thread_info.h b/arch/riscv/include/asm/thread_info.h
> index a390711129de..97bf5a1575d2 100644
> --- a/arch/riscv/include/asm/thread_info.h
> +++ b/arch/riscv/include/asm/thread_info.h
> @@ -74,6 +74,7 @@ struct thread_info {
>  #define TIF_SYSCALL_TRACEPOINT  6       /* syscall tracepoint instrumentation */
>  #define TIF_SYSCALL_AUDIT	7	/* syscall auditing */
>  #define TIF_SECCOMP		8	/* syscall secure computing */
> +#define TIF_NOTIFY_SIGNAL	9	/* signal notifications exist */
>  
>  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
>  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
> @@ -82,9 +83,11 @@ struct thread_info {
>  #define _TIF_SYSCALL_TRACEPOINT	(1 << TIF_SYSCALL_TRACEPOINT)
>  #define _TIF_SYSCALL_AUDIT	(1 << TIF_SYSCALL_AUDIT)
>  #define _TIF_SECCOMP		(1 << TIF_SECCOMP)
> +#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
>  
>  #define _TIF_WORK_MASK \
> -	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED)
> +	(_TIF_NOTIFY_RESUME | _TIF_SIGPENDING | _TIF_NEED_RESCHED | \
> +	 _TIF_NOTIFY_SIGNAL)
>  
>  #define _TIF_SYSCALL_WORK \
>  	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_TRACEPOINT | _TIF_SYSCALL_AUDIT | \
> diff --git a/arch/riscv/kernel/signal.c b/arch/riscv/kernel/signal.c
> index bc6841867b51..469aef8ed922 100644
> --- a/arch/riscv/kernel/signal.c
> +++ b/arch/riscv/kernel/signal.c
> @@ -310,7 +310,7 @@ asmlinkage __visible void do_notify_resume(struct pt_regs *regs,
>  					   unsigned long thread_info_flags)
>  {
>  	/* Handle pending signal delivery */
> -	if (thread_info_flags & _TIF_SIGPENDING)
> +	if (thread_info_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
>  		do_signal(regs);
>  
>  	if (thread_info_flags & _TIF_NOTIFY_RESUME)
> 


-- 
Jens Axboe