Re: [PATCH v3 06/12] Add get_user_pages() variant that fails ifmajor fault is required.

[Christoph Hellwig]

On Tue, Jan 05, 2010 at 04:12:48PM +0200, Gleb Natapov wrote:
> This patch add get_user_pages() variant that only succeeds if getting
> a reference to a page doesn't require major fault.

>  
> +int get_user_pages_noio(struct task_struct *tsk, struct mm_struct *mm,
> +		unsigned long start, int nr_pages, int write, int force,
> +		struct page **pages, struct vm_area_struct **vmas)
> +{
> +	int flags = FOLL_TOUCH | FOLL_MINOR;
> +
> +	if (pages)
> +		flags |= FOLL_GET;
> +	if (write)
> +		flags |= FOLL_WRITE;
> +	if (force)
> +		flags |= FOLL_FORCE;
> +
> +	return __get_user_pages(tsk, mm, start, nr_pages, flags, pages, vmas);

Wouldn't it be better to just export __get_user_pages as a proper user
interface, maybe replacing get_user_pages by it entirely?

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/