[RFC PATCH v2 2/2] ARM/mm/fault: Enable interrupts before sending signal

[Sebastian Andrzej Siewior]

On 2025-11-27 22:01:09 [+0800], Xie Yuanbin wrote:
> --- a/arch/arm/mm/fault.c
> +++ b/arch/arm/mm/fault.c
> @@ -184,10 +184,13 @@ __do_user_fault(unsigned long addr, unsigned int fsr, unsigned int sig,
>  	struct task_struct *tsk = current;
>  
>  	if (addr > TASK_SIZE)
>  		harden_branch_predictor();
>  
> +	if (IS_ENABLED(CONFIG_PREEMPT_RT))
> +		local_irq_enable();

This shouldn't be limited to CONFIG_PREEMPT_RT. There is nothing wrong
with enabling it unconditionally.

>  #ifdef CONFIG_DEBUG_USER
>  	if (((user_debug & UDBG_SEGV) && (sig == SIGSEGV)) ||
>  	    ((user_debug & UDBG_BUS)  && (sig == SIGBUS))) {
>  		pr_err("8<--- cut here ---\n");
>  		pr_err("%s: unhandled page fault (%d) at 0x%08lx, code 0x%03x\n",

Sebastian