linux-kernel - [RFC 3/3] ARM: provide CONFIG_VMSPLIT_4G

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Date:   Fri, 12 Jun 2020 15:48:44 +0530
From:   afzal mohammed <afzal.mohd.ma@...il.com>
To:     Russell King - ARM Linux admin <linux@...linux.org.uk>,
        Arnd Bergmann <arnd@...db.de>,
        Linus Walleij <linus.walleij@...aro.org>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-arm-kernel@...ts.infradead.org,
        Nicolas Pitre <nico@...xnic.net>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>
Subject: [RFC 3/3] ARM: provide CONFIG_VMSPLIT_4G_DEV for development

Select UACCESS_GUP_KMAP_MEMCPY initially.

Signed-off-by: afzal mohammed <afzal.mohd.ma@...il.com>
---
 arch/arm/Kconfig | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index c77c93c485a08..ae2687679d7c8 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1326,6 +1326,15 @@ config PAGE_OFFSET
 	default 0xB0000000 if VMSPLIT_3G_OPT
 	default 0xC0000000
 
+config VMSPLIT_4G_DEV
+	bool "Experimental changes for 4G/4G user/kernel split"
+	depends on ARM_LPAE
+	select UACCESS_GUP_KMAP_MEMCPY
+	help
+	  Experimental changes during 4G/4G user/kernel split development.
+	  Existing vmsplit config option is used, once development is done,
+	  this would be put as a new choice & _DEV suffix removed.
+
 config NR_CPUS
 	int "Maximum number of CPUs (2-32)"
 	range 2 32
-- 
2.26.2