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From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Subject: [PATCH v1 10/10] mm/usercopy.c: Update comment in check_page_span()
 regarding ZONE_DEVICE
Date: Thu, 24 Oct 2019 14:09:38 +0200
Message-Id: <20191024120938.11237-11-david@redhat.com>
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Cc: linux-hyperv@vger.kernel.org, Michal Hocko <mhocko@suse.com>,
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 YueHaibing <yuehaibing@huawei.com>,
 "Matthew Wilcox \(Oracle\)" <willy@infradead.org>,
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Sender: "Linuxppc-dev"
 <linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org>

ZONE_DEVICE (a.k.a. device memory) is no longer marked PG_reserved. Update
the comment.

While at it, make it match what the code is acutally doing (reject vs.
accept).

Cc: Kees Cook <keescook@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: "Isaac J. Manjarres" <isaacm@codeaurora.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Qian Cai <cai@lca.pw>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 mm/usercopy.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/mm/usercopy.c b/mm/usercopy.c
index 660717a1ea5c..80f254024c97 100644
--- a/mm/usercopy.c
+++ b/mm/usercopy.c
@@ -199,9 +199,9 @@ static inline void check_page_span(const void *ptr, uns=
igned long n,
 =09=09return;
=20
 =09/*
-=09 * Reject if range is entirely either Reserved (i.e. special or
-=09 * device memory), or CMA. Otherwise, reject since the object spans
-=09 * several independently allocated pages.
+=09 * Accept if the range is entirely either Reserved ("special") or
+=09 * CMA. Otherwise, reject since the object spans several independently
+=09 * allocated pages.
 =09 */
 =09is_reserved =3D PageReserved(page);
 =09is_cma =3D is_migrate_cma_page(page);
--=20
2.21.0