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

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Date:   Thu, 8 Jun 2017 12:04:43 -0400 (EDT)
From:   Nicolas Pitre <nicolas.pitre@...aro.org>
To:     Yisheng Xie <xieyisheng1@...wei.com>
cc:     linux@...linux.org.uk, catalin.marinas@....com,
        will.deacon@....com, linux-kernel@...r.kernel.org,
        viro@...iv.linux.org.uk, wangfangpeng1@...wei.com,
        guohanjun@...wei.com, matthias.bgg@...il.com,
        rmk+kernel@....linux.org.uk, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] ARM/Kconfig: make VMSPLIT_3G_OPT depends on !ARM_LPAE

On Thu, 8 Jun 2017, Yisheng Xie wrote:

> 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>

Acked-by: Nicolas Pitre <nico@...aro.org>

> ---
>  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
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@...ts.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
> 

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