From: Minchan Kim <minchan@kernel.org>
To: John Hubbard <jhubbard@nvidia.com>
Cc: linux-mm <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: pin_user_pages supports NULL pages arguments?
Date: Thu, 10 Feb 2022 11:17:27 -0800 [thread overview]
Message-ID: <YgVkxwYtLov6Z5WZ@google.com> (raw)
* pin_user_pages() - pin user pages in memory for use by other devices
< snip >
* @pages: array that receives pointers to the pages pinned.
* Should be at least nr_pages long. Or NULL, if caller
* only intends to ensure the pages are faulted in.
pin_user_pages(,, pages = NULL, );
gup_flags |= FOLL_PIN
__get_user_pages_locked
__get_user_pages
..
VM_BUG_ON(!!pages != !!(gup_flags & (FOLL_GET | FOLL_PIN)));
next reply other threads:[~2022-02-10 19:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-10 19:17 Minchan Kim [this message]
2022-02-10 19:20 ` pin_user_pages supports NULL pages arguments? John Hubbard
2022-02-10 19:29 ` Minchan Kim
2022-02-10 20:20 ` John Hubbard
2022-02-10 21:17 ` Minchan Kim
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