linux-kernel - Re: [PATCH] x86/mm: Fix PAGE_KERNEL

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Message-ID: <20211203191120.taonx5pwz4w3kmmm@ldmartin-desk2>
Date:   Fri, 3 Dec 2021 11:11:20 -0800
From:   Lucas De Marchi <lucas.demarchi@...el.com>
To:     Dave Hansen <dave.hansen@...el.com>
Cc:     Joerg Roedel <joro@...tes.org>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Borislav Petkov <bp@...en8.de>, Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        Brijesh Singh <brijesh.singh@....com>,
        linux-kernel@...r.kernel.org, Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH] x86/mm: Fix PAGE_KERNEL_IO removal breakage

On Fri, Dec 03, 2021 at 09:35:47AM -0800, Dave Hansen wrote:
>On 12/2/21 4:25 PM, Lucas De Marchi wrote:
>> About the first patch,
>> 6b2a2138cf36 ("drm/i915/gem: Stop using PAGE_KERNEL_IO"),
>> I didn't notice any regression on the i915
>> side though. Is it safe to keep it? Otherwise we are probably better
>> off reverting everything.
>
>I'm just going to drop both of those for now:
>
>	27dff0f58bde ("x86/mm: Nuke PAGE_KERNEL_IO")
>	6b2a2138cf36 ("drm/i915/gem: Stop using PAGE_KERNEL_IO")
>
>If you work out a fix, please integrate the patch from Joerg and resubmit.

yeah, that seems the best approach here.

thanks
Lucas De Marchi