linux-kernel - Re: [PATCH 4/4] x86: use pte_none() to test for empty PTE

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Date:	Wed, 13 Jul 2016 09:28:18 -0700
From:	Dave Hansen <dave.hansen@...el.com>
To:	Julia Lawall <julia.lawall@...6.fr>,
	Michal Hocko <mhocko@...nel.org>
Cc:	linux-kernel@...r.kernel.org, x86@...nel.org, linux-mm@...ck.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	bp@...en8.de, ak@...ux.intel.com, dave.hansen@...el.com,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 4/4] x86: use pte_none() to test for empty PTE

On 07/13/2016 08:49 AM, Julia Lawall wrote:
> My results are below.  There are a couple of cases in arch/mn10300/mm that
> were not in the original patch.

Yeah, so mn10300 is obviously unaffected by the erratum in question, and
I didn't look for non-x86 architectures for this patch.

But, this code definitely _looks_ like it should be using pte_none(),
especially since mn10300 defines it the same way as x86 (well, as x86
_did_ before this series).

	#define pte_none(x)		(!pte_val(x))

> diff -u -p a/arch/mn10300/mm/cache-inv-icache.c b/arch/mn10300/mm/cache-inv-icache.c
> --- a/arch/mn10300/mm/cache-inv-icache.c
> +++ b/arch/mn10300/mm/cache-inv-icache.c
> @@ -45,11 +45,11 @@ static void flush_icache_page_range(unsi
>  		return;
> 
>  	pud = pud_offset(pgd, start);
> -	if (!pud || !pud_val(*pud))
> +	if (!pud || pud_none(*pud))
>  		return;
> 
>  	pmd = pmd_offset(pud, start);
> -	if (!pmd || !pmd_val(*pmd))
> +	if (!pmd || pmd_none(*pmd))
>  		return;