[PATCH 4/6] arm64: Kill 32-bit applications scheduled on 64-bit-only CPUs

Catalin Marinas catalin.marinas at arm.com
Wed Oct 28 08:10:53 EDT 2020


On Tue, Oct 27, 2020 at 09:51:16PM +0000, Will Deacon wrote:
> diff --git a/arch/arm64/kernel/process.c b/arch/arm64/kernel/process.c
> index 4784011cecac..c45b5f9dd66b 100644
> --- a/arch/arm64/kernel/process.c
> +++ b/arch/arm64/kernel/process.c
> @@ -542,6 +542,17 @@ static void erratum_1418040_thread_switch(struct task_struct *prev,
>  	write_sysreg(val, cntkctl_el1);
>  }
>  
> +static void compat_thread_switch(struct task_struct *next)
> +{
> +	if (!is_compat_thread(task_thread_info(next)))
> +		return;
> +
> +	if (!system_has_mismatched_32bit_el0())
> +		return;
> +
> +	set_tsk_thread_flag(next, TIF_NOTIFY_RESUME);
> +}

I wonder whether you could use set_notify_resume() for consistency.

-- 
Catalin



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