[Xen-devel] [PATCH v1 10/10] mm/usercopy.c: Update comment in check_page_span() regarding ZONE_DEVICE

[David Hildenbrand <david@xxxxxxxxxx>]

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@xxxxxxxxxxxx>
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: "Isaac J. Manjarres" <isaacm@xxxxxxxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Qian Cai <cai@xxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: David Hildenbrand <david@xxxxxxxxxx>
---
 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, 
unsigned long n,
                return;
 
        /*
-        * Reject if range is entirely either Reserved (i.e. special or
-        * device memory), or CMA. Otherwise, reject since the object spans
-        * several independently allocated pages.
+        * Accept if the range is entirely either Reserved ("special") or
+        * CMA. Otherwise, reject since the object spans several independently
+        * allocated pages.
         */
        is_reserved = PageReserved(page);
        is_cma = is_migrate_cma_page(page);
-- 
2.21.0


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