Userspace programs segfaulting since CONFIG_ARM_PAN was introduced for LPAE

[Russell King (Oracle)]

On Fri, Jul 19, 2024 at 11:09:23AM +0000, Urja wrote:
> Hi,
> 
> Trying to start KDE Plasma (startplasma-wayland) on my ASUS C201 (RK3288) with any kernel since "ARM: 9358/2: Implement PAN for LPAE by TTBR0 page table walks disablement"* and CONFIG_ARM_PAN=y (enabled by default for an LPAE kernel in that commit) causes a segfault.

This is a known bug. Make sure you have this applied:

eebadafc3b14 ("ARM: 9398/1: Fix userspace enter on LPAE with CC_OPTIMIZE_FOR_SIZE=y")

Thanks.

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