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

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Message-ID: <20170608160941.GN4902@n2100.armlinux.org.uk>
Date:   Thu, 8 Jun 2017 17:09:41 +0100
From:   Russell King - ARM Linux <linux@...linux.org.uk>
To:     Yisheng Xie <xieyisheng1@...wei.com>
Cc:     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: Re: [PATCH] ARM/Kconfig: make VMSPLIT_3G_OPT depends on !ARM_LPAE

On Thu, Jun 08, 2017 at 02:05:44PM +0800, 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.

Yes, this is much more preferable.  Please drop it into the patch system,
thanks.

-- 
RMK's Patch system: http://www.armlinux.org.uk/developer/patches/
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