linux-kernel - Re: [PATCH 2/2] mm: optimize copy_page_to/from_iter

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Date:	Sat, 23 Jul 2016 13:59:13 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Mikulas Patocka <mpatocka@...hat.com>
Cc:	Michal Hocko <mhocko@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Mel Gorman <mgorman@...e.de>,
	Johannes Weiner <hannes@...xchg.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] mm: optimize copy_page_to/from_iter_iovec

Mikulas Patocka <mpatocka@...hat.com> writes:
>  	copy = min(bytes, iov->iov_len - skip);
>  
> +#ifdef CONFIG_HIGHMEM
>  	if (!fault_in_pages_writeable(buf, copy)) {

If you use IS_ENABLED in the if here ...

>  	kunmap(page);
> +
> +#ifdef CONFIG_HIGHMEM
>  done:
> +#endif

... you don't need this ifdef.

-Andi


-- 
ak@...ux.intel.com -- Speaking for myself only