Right now, ZONE_DEVICE memory is always set PG_reserved. We want to
change that.
We could explicitly check for is_zone_device_page(page). But looking at
the pfn_valid() check, it seems safer to just use pfn_to_online_page()
here, that will skip all ZONE_DEVICE pages right away.
Cc: Benjamin Herrenschmidt <b...@kernel.crashing.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Michael Ellerman <m...@ellerman.id.au>
Cc: Christophe Leroy <christophe.le...@c-s.fr>
Cc: "Aneesh Kumar K.V" <aneesh.ku...@linux.ibm.com>
Cc: Allison Randal <alli...@lohutok.net>
Cc: Nicholas Piggin <npig...@gmail.com>
Cc: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: David Hildenbrand <da...@redhat.com>
---
arch/powerpc/mm/pgtable.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/mm/pgtable.c b/arch/powerpc/mm/pgtable.c
index e3759b69f81b..613c98fa7dc0 100644
--- a/arch/powerpc/mm/pgtable.c
+++ b/arch/powerpc/mm/pgtable.c
@@ -55,10 +55,12 @@ static struct page *maybe_pte_to_page(pte_t pte)
unsigned long pfn = pte_pfn(pte);
struct page *page;
- if (unlikely(!pfn_valid(pfn)))
- return NULL;
- page = pfn_to_page(pfn);
- if (PageReserved(page))
+ /*
+ * We reject any pages that are not online (not managed by the buddy).
+ * This includes ZONE_DEVICE pages.
+ */
+ page = pfn_to_online_page(pfn);
+ if (unlikely(!page || PageReserved(page)))
return NULL;
return page;
}
--
2.21.0
_______________________________________________
devel mailing list
de...@linuxdriverproject.org
http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel
