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

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Message-ID: <df7f4b2c-9048-19f5-4817-45d29eec022c@linux.intel.com>
Date:   Fri, 20 Apr 2018 12:44:47 -0700
From:   Dave Hansen <dave.hansen@...ux.intel.com>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org, mceier@...il.com,
        aaro.koskinen@...ia.com, aarcange@...hat.com, luto@...nel.org,
        arjan@...ux.intel.com, bp@...en8.de, dan.j.williams@...el.com,
        dwmw2@...radead.org, gregkh@...uxfoundation.org, hughd@...gle.com,
        jpoimboe@...hat.com, jgross@...e.com, keescook@...gle.com,
        torvalds@...ux-foundation.org, namit@...are.com,
        peterz@...radead.org
Subject: Re: [PATCH 2/2] x86, pti: fix boot warning from Global-bit setting

On 04/20/2018 03:16 AM, Thomas Gleixner wrote:
>> 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. 

I've rewritten these changelogs and added some more fixes for this set.
I'll be sending it shortly.