[Intel-gfx] [PATCH] mm/gup: fixup gup.c for "mm/gup: refactor and de-duplicate gup_fast() code"

From: John Hubbard <jhubbard@nvidia.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Matthew Wilcox <willy@infradead.org>,
	dri-devel@lists.freedesktop.org, David Airlie <airlied@linux.ie>,
	John Hubbard <jhubbard@nvidia.com>,
	intel-gfx@lists.freedesktop.org,
	LKML <linux-kernel@vger.kernel.org>,
	Chris Wilson <chris@chris-wilson.co.uk>,
	linux-mm@kvack.org, Souptick Joarder <jrdr.linux@gmail.com>,
	Matthew Auld <matthew.auld@intel.com>
Subject: [Intel-gfx] [PATCH] mm/gup: fixup gup.c for "mm/gup: refactor and de-duplicate gup_fast() code"
Date: Thu, 21 May 2020 16:38:41 -0700	[thread overview]
Message-ID: <20200521233841.1279742-1-jhubbard@nvidia.com> (raw)

Include FOLL_FAST_ONLY in the list of flags to *not* WARN()
on, in internal_get_user_pages_fast().

Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: "Joonas Lahtinen" <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: John Hubbard <jhubbard@nvidia.com>
---

Hi Andrew, Chris,

Andrew: This is a fixup that applies to today's (20200521) linux-next.
In that tree, this fixes up:

commit dfb8dfe80808 ("mm/gup: refactor and de-duplicate gup_fast() code")

Chris: I'd like to request another CI run for the drm/i915 changes, so
for that, would you prefer that I post a v2 of the series [1], or
is it easier for you to just apply this patch here, on top of [2]?

[1] https://lore.kernel.org/r/20200519002124.2025955-1-jhubbard@nvidia.com

[2] https://lore.kernel.org/r/158985123351.31239.10766458886430429630@emeril.freedesktop.org

thanks,
John Hubbard
NVIDIA

 mm/gup.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/mm/gup.c b/mm/gup.c
index dd8895f2fafa1..ada6aa79576dc 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2724,7 +2724,8 @@ static int internal_get_user_pages_fast(unsigned long start, int nr_pages,
 	int nr_pinned = 0, ret = 0;
 
 	if (WARN_ON_ONCE(gup_flags & ~(FOLL_WRITE | FOLL_LONGTERM |
-				       FOLL_FORCE | FOLL_PIN | FOLL_GET)))
+				       FOLL_FORCE | FOLL_PIN | FOLL_GET |
+				       FOLL_FAST_ONLY)))
 		return -EINVAL;
 
 	start = untagged_addr(start) & PAGE_MASK;
-- 
2.26.2

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