From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andrew Morton Subject: [patch 055/128] mm/gup: introduce pin_user_pages_unlocked Date: Mon, 01 Jun 2020 21:48:27 -0700 Message-ID: <20200602044827.BhsiaDO-Z%akpm@linux-foundation.org> References: <20200601214457.919c35648e96a2b46b573fe1@linux-foundation.org> Reply-To: linux-kernel@vger.kernel.org Return-path: Received: from mail.kernel.org ([198.145.29.99]:39656 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725986AbgFBEs3 (ORCPT ); Tue, 2 Jun 2020 00:48:29 -0400 In-Reply-To: <20200601214457.919c35648e96a2b46b573fe1@linux-foundation.org> Sender: mm-commits-owner@vger.kernel.org List-Id: mm-commits@vger.kernel.org To: akpm@linux-foundation.org, awalls@md.metrocast.net, jhubbard@nvidia.com, linux-mm@kvack.org, mchehab@kernel.org, mm-commits@vger.kernel.org, torvalds@linux-foundation.org From: John Hubbard Subject: mm/gup: introduce pin_user_pages_unlocked Introduce pin_user_pages_unlocked(), which is nearly identical to the get_user_pages_unlocked() that it wraps, except that it sets FOLL_PIN and rejects FOLL_GET. Link: http://lkml.kernel.org/r/20200518012157.1178336-2-jhubbard@nvidia.com Signed-off-by: John Hubbard Reviewed-by: Andrew Morton Cc: Andy Walls Cc: Mauro Carvalho Chehab Signed-off-by: Andrew Morton --- include/linux/mm.h | 2 ++ mm/gup.c | 17 +++++++++++++++++ 2 files changed, 19 insertions(+) --- a/include/linux/mm.h~mm-gup-introduce-pin_user_pages_unlocked +++ a/include/linux/mm.h @@ -1713,6 +1713,8 @@ long get_user_pages_locked(unsigned long unsigned int gup_flags, struct page **pages, int *locked); long get_user_pages_unlocked(unsigned long start, unsigned long nr_pages, struct page **pages, unsigned int gup_flags); +long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, + struct page **pages, unsigned int gup_flags); int get_user_pages_fast(unsigned long start, int nr_pages, unsigned int gup_flags, struct page **pages); --- a/mm/gup.c~mm-gup-introduce-pin_user_pages_unlocked +++ a/mm/gup.c @@ -2960,3 +2960,20 @@ long pin_user_pages(unsigned long start, pages, vmas, gup_flags); } EXPORT_SYMBOL(pin_user_pages); + +/* + * pin_user_pages_unlocked() is the FOLL_PIN variant of + * get_user_pages_unlocked(). Behavior is the same, except that this one sets + * FOLL_PIN and rejects FOLL_GET. + */ +long pin_user_pages_unlocked(unsigned long start, unsigned long nr_pages, + struct page **pages, unsigned int gup_flags) +{ + /* FOLL_GET and FOLL_PIN are mutually exclusive. */ + if (WARN_ON_ONCE(gup_flags & FOLL_GET)) + return -EINVAL; + + gup_flags |= FOLL_PIN; + return get_user_pages_unlocked(start, nr_pages, pages, gup_flags); +} +EXPORT_SYMBOL(pin_user_pages_unlocked); _