[PATCH v3 10/10] ARM: add multi_v7_lpae_defconfig

[Alexander Stein]

From: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>

The only missing configuration option preventing us from using
multi_v7_defconfig with the Raspberry Pi 4 is ARM_LPAE. It's needed as
the PCIe controller found on the SoC depends on 64bit addressing, yet
can't be included as not all v7 boards support LPAE.

Introduce multi_v7_lpae_defconfig, built off multi_v7_defconfig, which will
avoid us having to duplicate and maintain multiple similar configurations.

Needless to say the Raspberry Pi 4 is not the only platform that can
benefit from this new configuration.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne at suse.de>
Signed-off-by: Alexander Stein <alexander.stein at ew.tq-group.com>
---
Changes in v3:
* As per Arnd's suggestion add CONFIG_VMSPLIT_2G to lpae.config fragment
* List multi_v7_lpae_defconfig target in 'make help' as well

Unfortunately the list of defconfigs is autogenerated, so this new
(explicit) target doesn't fit into this list. Therefore it's added to
'archhelp' instead.

 arch/arm/Makefile            | 6 ++++++
 arch/arm/configs/lpae.config | 2 ++
 2 files changed, 8 insertions(+)
 create mode 100644 arch/arm/configs/lpae.config

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index a353b92641f36..485a439e22ca8 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -314,6 +314,10 @@ endif
 # My testing targets (bypasses dependencies)
 bp:;	$(Q)$(MAKE) $(build)=$(boot) $(boot)/bootpImage
 
+include $(srctree)/scripts/Makefile.defconf
+PHONY += multi_v7_lpae_defconfig
+multi_v7_lpae_defconfig:
+	$(call merge_into_defconfig,multi_v7_defconfig,lpae)
 
 define archhelp
   echo  '* zImage        - Compressed kernel image (arch/$(ARCH)/boot/zImage)'
@@ -329,4 +333,6 @@ define archhelp
   echo  '                  (distribution) /sbin/$(INSTALLKERNEL) or'
   echo  '                  install to $$(INSTALL_PATH) and run lilo'
   echo  '  vdso_install  - Install unstripped vdso.so to $$(INSTALL_MOD_PATH)/vdso'
+  echo
+  echo  '  multi_v7_lpae_defconfig     - multi_v7_defconfig with CONFIG_ARM_LPAE enabled'
 endef
diff --git a/arch/arm/configs/lpae.config b/arch/arm/configs/lpae.config
new file mode 100644
index 0000000000000..a6d6f7ab3c01a
--- /dev/null
+++ b/arch/arm/configs/lpae.config
@@ -0,0 +1,2 @@
+CONFIG_ARM_LPAE=y
+CONFIG_VMSPLIT_2G=y
-- 
2.34.1