linux-kernel - Re: [PATCH RT v3] arm64: fpsimd: use preemp_disable in addition to local_bh

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Date:   Fri, 27 Jul 2018 05:17:23 +0200
From:   Mike Galbraith <efault@....de>
To:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>
Cc:     Dave Martin <Dave.Martin@....com>, linux-rt-users@...r.kernel.org,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org, tglx@...utronix.de,
        linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH RT v3] arm64: fpsimd: use preemp_disable in addition to
 local_bh_disable()

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