Re: [PATCH v3 02/13] arm64: Kconfig: Reword UNMAP_KERNEL_AT_EL0 kconfig entry

[Christoph Hellwig]

On Mon, Jan 08, 2018 at 05:32:27PM +0000, Will Deacon wrote:
> Although CONFIG_UNMAP_KERNEL_AT_EL0 does make KASLR more robust, it's
> actually more useful as a mitigation against speculation attacks that
> can leak arbitrary kernel data to userspace through speculation.
> 
> Reword the Kconfig help message to reflect this, and make the option
> depend on EXPERT so that it is on by default for the majority of users.

I still haven't heard an anwer on why this isn't using
CONFIG_PAGE_TABLE_ISOLATION but instead reinvents its own symbol.