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SubjectRe: [PATCH v3 06/12] Add get_user_pages() variant that fails if major fault is required.
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?



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