target/linux/layerscape/patches-4.4/3009-armv8-aarch32-Allow-RAM-to-be-mapped-for-LayerScape-.patch

   1 From ef25bf644b7de83849a2f804c84bb54cd2f1255f Mon Sep 17 00:00:00 2001
   2 From: Alison Wang <b18965@freescale.com>
   3 Date: Mon, 11 Apr 2016 17:25:40 +0800
   4 Subject: [PATCH 09/70] armv8: aarch32: Allow RAM to be mapped for LayerScape
   5  SoC
   6
   7 This patch is based on Kernel v4.1.8. As in v4.1.8, memremap() is not
   8 introduced and the WARN() check is not relaxed to allow MT_MEMORY_RW
   9 mappings of pfn_valid() pages, this patch is needed as a workaround for
  10 spin-table address which locates in RAM to be mapped.
  11
  12 For the latest kernel in upstream, this patch is not needed anymore.
  13
  14 Signed-off-by: Alison Wang <alison.wang@nxp.com>
  15 ---
  16  arch/arm/mm/ioremap.c |    2 ++
  17  1 file changed, 2 insertions(+)
  18
  19 --- a/arch/arm/mm/ioremap.c
  20 +++ b/arch/arm/mm/ioremap.c
  21 @@ -298,8 +298,10 @@ static void __iomem * __arm_ioremap_pfn_
  22         /*
  23          * Don't allow RAM to be mapped - this causes problems with ARMv6+
  24          */
  25 +#ifndef CONFIG_ARCH_LAYERSCAPE
  26         if (WARN_ON(pfn_valid(pfn)))
  27                 return NULL;
  28 +#endif
  29
  30         area = get_vm_area_caller(size, VM_IOREMAP, caller);
  31         if (!area)