Re: [PATCH RT v3] arm64: fpsimd: use preemp_disable in addition to local_bh_disable()

[Mike Galbraith]

On Thu, 2018-07-26 at 17:06 +0200, Sebastian Andrzej Siewior wrote:
> 
> @@ -1115,6 +1139,7 @@ void kernel_neon_begin(void)
>  
>  	BUG_ON(!may_use_simd());
>  
> +	preempt_disable();
>  	local_bh_disable();
>  
>  	__this_cpu_write(kernel_neon_busy, true);
> @@ -1131,6 +1156,7 @@ void kernel_neon_begin(void)
>  	preempt_disable();

Nit: this preempt_disable() could be removed...
 
>  	local_bh_enable();
> +	preempt_enable();
>  }
>  EXPORT_SYMBOL(kernel_neon_begin);

...instead of adding this one.

	-Mike