linux-kernel - Re: [PATCH v5 2/3] mm: introduce put_user

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Date:   Wed, 10 Oct 2018 10:03:26 +0200
From:   Jan Kara <jack@...e.cz>
To:     john.hubbard@...il.com
Cc:     Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Christopher Lameter <cl@...ux.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Dan Williams <dan.j.williams@...el.com>,
        Jan Kara <jack@...e.cz>, linux-mm@...ck.org,
        LKML <linux-kernel@...r.kernel.org>,
        linux-rdma <linux-rdma@...r.kernel.org>,
        linux-fsdevel@...r.kernel.org, John Hubbard <jhubbard@...dia.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Jerome Glisse <jglisse@...hat.com>,
        Christoph Hellwig <hch@...radead.org>,
        Ralph Campbell <rcampbell@...dia.com>
Subject: Re: [PATCH v5 2/3] mm: introduce put_user_page*(), placeholder
 versions

On Tue 09-10-18 21:11:33, john.hubbard@...il.com wrote:
> +/*
> + * put_user_pages() - for each page in the @pages array, release the page
> + * using put_user_page().
> + *
> + * Please see the put_user_page() documentation for details.
> + *
> + * This is just like put_user_pages_dirty(), except that it invokes
> + * set_page_dirty_lock(), instead of set_page_dirty().

This paragraph should be deleted. Other than that the patch looks good.

								Honza

> + *
> + * @pages:  array of pages to be marked dirty and released.
> + * @npages: number of pages in the @pages array.
> + *
> + */
> +void put_user_pages(struct page **pages, unsigned long npages)
> +{
> +	unsigned long index;
> +
> +	for (index = 0; index < npages; index++)
> +		put_user_page(pages[index]);
> +}
> +EXPORT_SYMBOL(put_user_pages);
> +
>  /*
>   * get_kernel_pages() - pin kernel pages in memory
>   * @kiov:	An array of struct kvec structures
> -- 
> 2.19.1
> 
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR