[source] x86/generic: use HIGHMEM64G instead of HIGHMEM4G to fix PAE and Xen

[LEDE Commits]

nbd pushed a commit to source.git, branch lede-17.01:
https://git.lede-project.org/f52b404aeea328b4e021a245c640ed3b0e095fa8

commit f52b404aeea328b4e021a245c640ed3b0e095fa8
Author: Baptiste Jonglez <git at bitsofnetworks.org>
AuthorDate: Sat Jul 15 22:57:53 2017 +0200

    x86/generic: use HIGHMEM64G instead of HIGHMEM4G to fix PAE and Xen
    
    This is a backport of 641a65fd062987a456216cc4fa91ff2910528261 in master.
    
    This change re-enables PAE for the 32-bit x86 subtarget, which is
    interesting in its own right but also necessary for Xen support.
    
    Commit af1d1ebd ("x86: enable 4G high memory support for generic (32bit)
    subtarget") inadvertently disabled both PAE and Xen support.
    
    Fixes: FS#908
    
    Cc: Daniel Golle <daniel at makrotopia.org>
    Cc: Jo-Philipp Wich <jo at mein.io>
    Signed-off-by: Baptiste Jonglez <git at bitsofnetworks.org>
---
 target/linux/x86/generic/config-default | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/target/linux/x86/generic/config-default b/target/linux/x86/generic/config-default
index 1a14c27..c4ca4fd 100644
--- a/target/linux/x86/generic/config-default
+++ b/target/linux/x86/generic/config-default
@@ -42,6 +42,7 @@ CONFIG_AGP_INTEL=y
 # CONFIG_AGP_SWORKS is not set
 # CONFIG_AGP_VIA is not set
 # CONFIG_APM is not set
+CONFIG_ARCH_DMA_ADDR_T_64BIT=y
 CONFIG_ARCH_ENABLE_SPLIT_PMD_PTLOCK=y
 CONFIG_ARCH_MIGHT_HAVE_ACPI_PDC=y
 CONFIG_ARCH_PHYS_ADDR_T_64BIT=y
@@ -165,7 +166,8 @@ CONFIG_HDMI=y
 CONFIG_HIBERNATE_CALLBACKS=y
 CONFIG_HID=y
 CONFIG_HID_BATTERY_STRENGTH=y
-# CONFIG_HIGHMEM64G is not set
+# CONFIG_HIGHMEM4G is not set
+CONFIG_HIGHMEM64G=y
 CONFIG_HOTPLUG_CPU=y
 CONFIG_HPET=y
 CONFIG_HPET_MMAP=y
@@ -267,6 +269,7 @@ CONFIG_PATA_VIA=y
 CONFIG_PCIEAER=y
 CONFIG_PCIEPORTBUS=y
 CONFIG_PCIE_PME=y
+CONFIG_PCI_BUS_ADDR_T_64BIT=y
 CONFIG_PCI_MMCONFIG=y
 CONFIG_PCI_XEN=y
 # CONFIG_PCWATCHDOG is not set