linux-kernel - Re: [PATCH] nds32: add support for TIF_NOTIFY

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Date:   Thu, 5 Nov 2020 09:18:25 -0700
From:   Jens Axboe <axboe@...nel.dk>
To:     Nick Hu <nickhu@...estech.com>, Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] nds32: add support for TIF_NOTIFY_SIGNAL

Gentle nudge on this one.

On 10/29/20 10:17 AM, Jens Axboe wrote:
> Wire up TIF_NOTIFY_SIGNAL handling for nds32.
> 
> Cc: Nick Hu <nickhu@...estech.com>
> Cc: Greentime Hu <green.hu@...il.com>
> Cc: Vincent Chen <deanbo422@...il.com>
> Signed-off-by: Jens Axboe <axboe@...nel.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/nds32/include/asm/thread_info.h | 2 ++
>  arch/nds32/kernel/ex-exit.S          | 2 +-
>  arch/nds32/kernel/signal.c           | 2 +-
>  3 files changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/nds32/include/asm/thread_info.h b/arch/nds32/include/asm/thread_info.h
> index c135111ec44e..d3967ad184f0 100644
> --- a/arch/nds32/include/asm/thread_info.h
> +++ b/arch/nds32/include/asm/thread_info.h
> @@ -48,6 +48,7 @@ struct thread_info {
>  #define TIF_NEED_RESCHED	2
>  #define TIF_SINGLESTEP		3
>  #define TIF_NOTIFY_RESUME	4	/* callback before returning to user */
> +#define TIF_NOTIFY_SIGNAL	5	/* signal notifications exist */
>  #define TIF_SYSCALL_TRACE	8
>  #define TIF_POLLING_NRFLAG	17
>  #define TIF_MEMDIE		18
> @@ -57,6 +58,7 @@ struct thread_info {
>  #define _TIF_SIGPENDING		(1 << TIF_SIGPENDING)
>  #define _TIF_NEED_RESCHED	(1 << TIF_NEED_RESCHED)
>  #define _TIF_NOTIFY_RESUME	(1 << TIF_NOTIFY_RESUME)
> +#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
>  #define _TIF_SINGLESTEP		(1 << TIF_SINGLESTEP)
>  #define _TIF_SYSCALL_TRACE	(1 << TIF_SYSCALL_TRACE)
>  #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
> diff --git a/arch/nds32/kernel/ex-exit.S b/arch/nds32/kernel/ex-exit.S
> index 6a2966c2d8c8..b30699911b81 100644
> --- a/arch/nds32/kernel/ex-exit.S
> +++ b/arch/nds32/kernel/ex-exit.S
> @@ -120,7 +120,7 @@ work_pending:
>  	andi	$p1, $r1, #_TIF_NEED_RESCHED
>  	bnez	$p1, work_resched
>  
> -	andi	$p1, $r1, #_TIF_SIGPENDING|#_TIF_NOTIFY_RESUME
> +	andi	$p1, $r1, #_TIF_SIGPENDING|#_TIF_NOTIFY_RESUME|#_TIF_NOTIFY_SIGNAL
>  	beqz	$p1, no_work_pending
>  
>  	move	$r0, $sp			! 'regs'
> diff --git a/arch/nds32/kernel/signal.c b/arch/nds32/kernel/signal.c
> index 2acb94812af9..7e3ca430a223 100644
> --- a/arch/nds32/kernel/signal.c
> +++ b/arch/nds32/kernel/signal.c
> @@ -376,7 +376,7 @@ static void do_signal(struct pt_regs *regs)
>  asmlinkage void
>  do_notify_resume(struct pt_regs *regs, unsigned int thread_flags)
>  {
> -	if (thread_flags & _TIF_SIGPENDING)
> +	if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
>  		do_signal(regs);
>  
>  	if (thread_flags & _TIF_NOTIFY_RESUME)
> 


-- 
Jens Axboe