[PATCH RFC v1 07/12] staging: kpc2000: Prepare transfer_complete_cb() for PG_reserved changes

From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, "David Hildenbrand" <david@redhat.com>,
	"Michal Hocko" <mhocko@kernel.org>,
	"Andrew Morton" <akpm@linux-foundation.org>,
	kvm-ppc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org,
	kvm@vger.kernel.org, linux-hyperv@vger.kernel.org,
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	"Allison Randal" <allison@lohutok.net>,
	"Andy Lutomirski" <luto@kernel.org>,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
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Subject: [PATCH RFC v1 07/12] staging: kpc2000: Prepare transfer_complete_cb() for PG_reserved changes
Date: Tue, 22 Oct 2019 19:12:34 +0200	[thread overview]
Message-ID: <20191022171239.21487-8-david@redhat.com> (raw)
In-Reply-To: <20191022171239.21487-1-david@redhat.com>

Right now, ZONE_DEVICE memory is always set PG_reserved. We want to
change that.

The pages are obtained via get_user_pages_fast(). I assume, these
could be ZONE_DEVICE pages. Let's just exclude them as well explicitly.

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Vandana BN <bnvandana@gmail.com>
Cc: "Simon Sandström" <simon@nikanor.nu>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Nishka Dasgupta <nishkadg.linux@gmail.com>
Cc: Madhumitha Prabakaran <madhumithabiw@gmail.com>
Cc: Fabio Estevam <festevam@gmail.com>
Cc: Matt Sickler <Matt.Sickler@daktronics.com>
Cc: Jeremy Sowden <jeremy@azazel.net>
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 drivers/staging/kpc2000/kpc_dma/fileops.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/staging/kpc2000/kpc_dma/fileops.c b/drivers/staging/kpc2000/kpc_dma/fileops.c
index cb52bd9a6d2f..457adcc81fe6 100644
--- a/drivers/staging/kpc2000/kpc_dma/fileops.c
+++ b/drivers/staging/kpc2000/kpc_dma/fileops.c
@@ -212,7 +212,8 @@ void  transfer_complete_cb(struct aio_cb_data *acd, size_t xfr_count, u32 flags)
 	BUG_ON(acd->ldev->pldev == NULL);
 
 	for (i = 0 ; i < acd->page_count ; i++) {
-		if (!PageReserved(acd->user_pages[i])) {
+		if (!PageReserved(acd->user_pages[i]) &&
+		    !is_zone_device_page(acd->user_pages[i])) {
 			set_page_dirty(acd->user_pages[i]);
 		}
 	}
-- 
2.21.0


