linux-kernel - Re: [PATCH -rt] ARM TLB flush fix: don't forget to re-enable preemption

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Date:	Tue, 22 May 2007 16:25:20 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Kevin Hilman <khilman@...sta.com>
Cc:	Ingo Molnar <mingo@...e.hu>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH -rt] ARM TLB flush fix: don't forget to re-enable
	preemption

On Tue, 2007-05-22 at 16:01 -0700, Kevin Hilman wrote:
> Add a preempt_enable() to flush_tlb_kernel_page() since -rt4 patch
> adds a preempt_disable but no preempt_enable().
> 
> Signed-off-by: Kevin Hilman <khilman@...sta.com>
> 
> 
> ---
>  include/asm-arm/tlbflush.h |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux-2.6.21/include/asm-arm/tlbflush.h
> ===================================================================
> --- linux-2.6.21.orig/include/asm-arm/tlbflush.h
> +++ linux-2.6.21/include/asm-arm/tlbflush.h
> @@ -378,6 +378,7 @@ static inline void local_flush_tlb_kerne
>  		asm("mcr p15, 0, %0, c8, c6, 1" : : "r" (kaddr) : "cc");
>  	if (tlb_flag(TLB_V6_I_PAGE))
>  		asm("mcr p15, 0, %0, c8, c5, 1" : : "r" (kaddr) : "cc");

Aren't these mcr operations atomic?

Daniel

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