linux-kernel - [PATCH] mm/gup: fixup gup.c for "mm/gup: refactor and de-duplicate gup

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Date:   Thu, 21 May 2020 16:38:41 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
CC:     Souptick Joarder <jrdr.linux@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        "Joonas Lahtinen" <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Chris Wilson <chris@...is-wilson.co.uk>,
        Tvrtko Ursulin <tvrtko.ursulin@...el.com>,
        Matthew Auld <matthew.auld@...el.com>,
        <intel-gfx@...ts.freedesktop.org>,
        <dri-devel@...ts.freedesktop.org>,
        LKML <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        John Hubbard <jhubbard@...dia.com>
Subject: [PATCH] mm/gup: fixup gup.c for "mm/gup: refactor and de-duplicate gup_fast() code"

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

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