[PATCH] arm64: add support for TIF_NOTIFY_SIGNAL

[Jens Axboe]

Gentle nudge on this one.

On 10/29/20 10:11 AM, Jens Axboe wrote:
> Cc: linux-arm-kernel 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/arm64/include/asm/thread_info.h | 5 ++++-
>  arch/arm64/kernel/signal.c           | 2 +-
>  2 files changed, 5 insertions(+), 2 deletions(-)
> 
> diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
> index 1fbab854a51b..cdcf307764aa 100644
> --- a/arch/arm64/include/asm/thread_info.h
> +++ b/arch/arm64/include/asm/thread_info.h
> @@ -68,6 +68,7 @@ void arch_release_task_struct(struct task_struct *tsk);
>  #define TIF_UPROBE		4	/* uprobe breakpoint or singlestep */
>  #define TIF_FSCHECK		5	/* Check FS is USER_DS on return */
>  #define TIF_MTE_ASYNC_FAULT	6	/* MTE Asynchronous Tag Check Fault */
> +#define TIF_NOTIFY_SIGNAL	7	/* signal notifications exist */
>  #define TIF_SYSCALL_TRACE	8	/* syscall trace active */
>  #define TIF_SYSCALL_AUDIT	9	/* syscall auditing */
>  #define TIF_SYSCALL_TRACEPOINT	10	/* syscall tracepoint for ftrace */
> @@ -98,10 +99,12 @@ void arch_release_task_struct(struct task_struct *tsk);
>  #define _TIF_32BIT		(1 << TIF_32BIT)
>  #define _TIF_SVE		(1 << TIF_SVE)
>  #define _TIF_MTE_ASYNC_FAULT	(1 << TIF_MTE_ASYNC_FAULT)
> +#define _TIF_NOTIFY_SIGNAL	(1 << TIF_NOTIFY_SIGNAL)
>  
>  #define _TIF_WORK_MASK		(_TIF_NEED_RESCHED | _TIF_SIGPENDING | \
>  				 _TIF_NOTIFY_RESUME | _TIF_FOREIGN_FPSTATE | \
> -				 _TIF_UPROBE | _TIF_FSCHECK | _TIF_MTE_ASYNC_FAULT)
> +				 _TIF_UPROBE | _TIF_FSCHECK | _TIF_MTE_ASYNC_FAULT | \
> +				 _TIF_NOTIFY_SIGNAL)
>  
>  #define _TIF_SYSCALL_WORK	(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \
>  				 _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \
> diff --git a/arch/arm64/kernel/signal.c b/arch/arm64/kernel/signal.c
> index a8184cad8890..bec6ef69704f 100644
> --- a/arch/arm64/kernel/signal.c
> +++ b/arch/arm64/kernel/signal.c
> @@ -942,7 +942,7 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
>  					       (void __user *)NULL, current);
>  			}
>  
> -			if (thread_flags & _TIF_SIGPENDING)
> +			if (thread_flags & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
>  				do_signal(regs);
>  
>  			if (thread_flags & _TIF_NOTIFY_RESUME) {
> 


-- 
Jens Axboe