[PATCH 3/3] powerpc/mm/radix: Skip ptesync in pte update helpers

[Michael Neuling]

On Thu, 2017-02-09 at 08:28 +0530, Aneesh Kumar K.V wrote:
> We do them at the start of tlb flush, and we are sure a pte update will be
> followed by a tlbflush. Hence we can skip the ptesync in pte update helpers.
> 
> Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>

Tested-by: Michael Neuling <mikey at neuling.org>

> ---
>  arch/powerpc/include/asm/book3s/64/radix.h | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/arch/powerpc/include/asm/book3s/64/radix.h
> b/arch/powerpc/include/asm/book3s/64/radix.h
> index fcf822d6c204..77e590c77299 100644
> --- a/arch/powerpc/include/asm/book3s/64/radix.h
> +++ b/arch/powerpc/include/asm/book3s/64/radix.h
> @@ -144,13 +144,11 @@ static inline unsigned long radix__pte_update(struct
> mm_struct *mm,
>  		 * new value of pte
>  		 */
>  		new_pte = (old_pte | set) & ~clr;
> -		asm volatile("ptesync" : : : "memory");
>  		radix__flush_tlb_pte_p9_dd1(old_pte, mm, addr);
>  		if (new_pte)
>  			__radix_pte_update(ptep, 0, new_pte);
>  	} else
>  		old_pte = __radix_pte_update(ptep, clr, set);
> -	asm volatile("ptesync" : : : "memory");
>  	if (!huge)
>  		assert_pte_locked(mm, addr);
>  
> @@ -195,7 +193,6 @@ static inline void radix__ptep_set_access_flags(struct
> mm_struct *mm,
>  		unsigned long old_pte, new_pte;
>  
>  		old_pte = __radix_pte_update(ptep, ~0, 0);
> -		asm volatile("ptesync" : : : "memory");
>  		/*
>  		 * new value of pte
>  		 */