linux-kernel - [PATCH 1/1] kconfig: add CPU endian selection beconfig and leconfig

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Date:	Thu, 26 Nov 2015 11:59:55 -0800
From:	Scott Branden <sbranden@...adcom.com>
To:	"Yann E. MORIN" <yann.morin.1998@...e.fr>
CC:	<linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<bcm-kernel-feedback-list@...adcom.com>,
	Scott Branden <sbranden@...adcom.com>
Subject: [PATCH 1/1] kconfig: add CPU endian selection beconfig and leconfig

Add support for switching defconfig between big and little endian CPU.
Various CPU types have ability to select big and little endian
CPU in the kernel configuration.

"make beconfig" will set CONFIG_CPU_BIG_ENDIAN
"make leconfig" will unset CONFIG_CPU_BIG_ENDIAN

Signed-off-by: Scott Branden <sbranden@...adcom.com>
---
 kernel/configs/be.config |  1 +
 kernel/configs/le.config |  1 +
 scripts/kconfig/Makefile | 10 ++++++++++
 3 files changed, 12 insertions(+)
 create mode 100644 kernel/configs/be.config
 create mode 100644 kernel/configs/le.config

diff --git a/kernel/configs/be.config b/kernel/configs/be.config
new file mode 100644
index 0000000..c5cdc99
--- /dev/null
+++ b/kernel/configs/be.config
@@ -0,0 +1 @@
+CONFIG_CPU_BIG_ENDIAN=y
diff --git a/kernel/configs/le.config b/kernel/configs/le.config
new file mode 100644
index 0000000..be479cf
--- /dev/null
+++ b/kernel/configs/le.config
@@ -0,0 +1 @@
+# CONFIG_CPU_BIG_ENDIAN is not set
diff --git a/scripts/kconfig/Makefile b/scripts/kconfig/Makefile
index d79cba4..2e8007e 100644
--- a/scripts/kconfig/Makefile
+++ b/scripts/kconfig/Makefile
@@ -126,6 +126,14 @@ PHONY += tinyconfig
 tinyconfig:
 	$(Q)$(MAKE) -f $(srctree)/Makefile allnoconfig tiny.config
 
+PHONY += beconfig
+beconfig: be.config
+	@:
+
+PHONY += leconfig
+leconfig: le.config
+	@:
+
 # Help text used by make help
 help:
 	@echo  '  config	  - Update current config utilising a line-oriented program'
@@ -151,6 +159,8 @@ help:
 	@echo  '  kvmconfig	  - Enable additional options for kvm guest kernel support'
 	@echo  '  xenconfig       - Enable additional options for xen dom0 and guest kernel support'
 	@echo  '  tinyconfig	  - Configure the tiniest possible kernel'
+	@echo  '  beconfig	  - Update current config to use big endian CPU'
+	@echo  '  leconfig	  - Update current config to use little endian CPU'
 
 # lxdialog stuff
 check-lxdialog  := $(srctree)/$(src)/lxdialog/check-lxdialog.sh
-- 
2.5.0

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