target/linux/layerscape/patches-5.4/809-jailhouse-0002-ivshmem-net-Map-shmem-region-as-RAM.patch

   1 From 4677dd55d55832dab1e4f41fe9a7fabe8bb95197 Mon Sep 17 00:00:00 2001
   2 From: Jan Kiszka <jan.kiszka@siemens.com>
   3 Date: Thu, 24 Nov 2016 08:27:45 +0100
   4 Subject: [PATCH] ivshmem-net: Map shmem region as RAM
   5
   6 No need for special caching, simply map the shared memory region like
   7 RAM, thus write-back. This gives us another order of magnitude in
   8 throughput.
   9
  10 Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
  11 (cherry picked from commit af59c6541a65622cab498851e01653dd378cd9f8)
  12 ---
  13  drivers/net/ivshmem-net.c | 2 +-
  14  1 file changed, 1 insertion(+), 1 deletion(-)
  15
  16 --- a/drivers/net/ivshmem-net.c
  17 +++ b/drivers/net/ivshmem-net.c
  18 @@ -802,7 +802,7 @@ static int ivshm_net_probe(struct pci_de
  19         if (!devm_request_mem_region(&pdev->dev, shmaddr, shmlen, DRV_NAME))
  20                 return -EBUSY;
  21
  22 -       shm = devm_memremap(&pdev->dev, shmaddr, shmlen, MEMREMAP_WC);
  23 +       shm = devm_memremap(&pdev->dev, shmaddr, shmlen, MEMREMAP_WB);
  24         if (!shm)
  25                 return -ENOMEM;
  26