linux-kernel - [PATCH 2/2] ARM: add multi_v7_lpae

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Date:   Mon,  3 Feb 2020 19:48:19 +0100
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     linux@...linux.org.uk, linux-arm-kernel@...ts.infradead.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kbuild@...r.kernel.org
Cc:     bcm-kernel-feedback-list@...adcom.com,
        linux-rpi-kernel@...ts.infradead.org, f.fainelli@...il.com,
        yamada.masahiro@...ionext.com,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] ARM: add multi_v7_lpae_defconfig

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@...e.de>

---

Changes since RFC:
 - Move config merge function into scripts folder
---
 arch/arm/Makefile            | 4 ++++
 arch/arm/configs/lpae.config | 1 +
 2 files changed, 5 insertions(+)
 create mode 100644 arch/arm/configs/lpae.config

diff --git a/arch/arm/Makefile b/arch/arm/Makefile
index 16d41efea7f2..1f4f9a90561d 100644
--- a/arch/arm/Makefile
+++ b/arch/arm/Makefile
@@ -359,6 +359,10 @@ archclean:
 # My testing targets (bypasses dependencies)
 bp:;	$(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(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)'
diff --git a/arch/arm/configs/lpae.config b/arch/arm/configs/lpae.config
new file mode 100644
index 000000000000..19bab134e014
--- /dev/null
+++ b/arch/arm/configs/lpae.config
@@ -0,0 +1 @@
+CONFIG_ARM_LPAE=y
-- 
2.25.0