Re: [PATCH 2/2] x86, pti: fix boot warning from Global-bit setting

[Thomas Gleixner]

On Tue, 17 Apr 2018, Dave Hansen wrote:

> 
> These are _very_ lightly tested.  I'm throwing them out there for
> folks are looking for a fix.
> 
> ---
> 
> From: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
> 
> pageattr.c is not friendly when it encounters empty (zero) PTEs.  The
> kernel linear map is exempt from these checks, but kernel text is not.
> This patch adds the code to also exempt kernel text from these checks.

Bah. Changelogs should tell the WHY and not the WHAT

> The proximate cause of these warnings was most likely an __init area
> that spanned a 2MB page boundary that resulted in a "zero" PMD.

This doesn't make any sense at all. 

Thanks,

	tglx