linux-kernel - [PATCH] ARM/Kconfig: make VMSPLIT_3G_OPT depends on !ARM

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Message-ID: <1496901944-42140-1-git-send-email-xieyisheng1@huawei.com>
Date:   Thu, 8 Jun 2017 14:05:44 +0800
From:   Yisheng Xie <xieyisheng1@...wei.com>
To:     <linux@...linux.org.uk>
CC:     <rmk+kernel@....linux.org.uk>, <matthias.bgg@...il.com>,
        <viro@...iv.linux.org.uk>, <nico@...aro.org>,
        <catalin.marinas@....com>, <will.deacon@....com>,
        <guohanjun@...wei.com>, <wangfangpeng1@...wei.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] ARM/Kconfig: make VMSPLIT_3G_OPT depends on !ARM_LPAE

When both enable CONFIG_ARM_LPAE=y and CONFIG_VMSPLIT_3G_OPT=y, which
means use PAGE_OFFSET=0xB0000000 with ARM_LPAE, the kernel will boot
fail and stop after uncompressed:

   Starting kernel ...

   Uart base = 0x20001000
   watchdog reg = 0x20013000
   dtb addr = 0x80840308
   Uncompressing Linux... done, booting the kernel.

For ARM_LPAE only support 3:1, 2:2, 1:3 split of TTBR1, which mention in:
   http://elinux.org/images/6/6a/Elce11_marinas.pdf - p16

So we should make VMSPLIT_3G_OPT depends on !ARM_LPAE to avoid trigger
this bug.

Signed-off-by: Yisheng Xie <xieyisheng1@...wei.com>
---
 arch/arm/Kconfig | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 4c1a35f..c0fcab6 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -1416,6 +1416,7 @@ choice
 	config VMSPLIT_3G
 		bool "3G/1G user/kernel split"
 	config VMSPLIT_3G_OPT
+		depends on !ARM_LPAE
 		bool "3G/1G user/kernel split (for full 1G low memory)"
 	config VMSPLIT_2G
 		bool "2G/2G user/kernel split"
-- 
1.7.12.4