linux-kernel - Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging for 4.15, Part 1

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Message-ID: <20171020094913.GA5359@bgram>
Date:   Fri, 20 Oct 2017 02:49:13 -0700
From:   Minchan Kim <minchan@...nel.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        Ingo Molnar <mingo@...hat.com>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Linus Torvalds <torvalds@...ux-foundation.org>, x86@...nel.org,
        Thomas Gleixner <tglx@...utronix.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...capital.net>,
        Cyrill Gorcunov <gorcunov@...nvz.org>,
        Borislav Petkov <bp@...e.de>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/6] Boot-time switching between 4- and 5-level paging
 for 4.15, Part 1

Hi Ingo,

On Fri, Oct 20, 2017 at 10:18:53AM +0200, Ingo Molnar wrote:
> 
> * Kirill A. Shutemov <kirill@...temov.name> wrote:
> 
> > On Tue, Oct 03, 2017 at 11:27:54AM +0300, Kirill A. Shutemov wrote:
> > > On Fri, Sep 29, 2017 at 05:08:15PM +0300, Kirill A. Shutemov wrote:
> > > > The first bunch of patches that prepare kernel to boot-time switching
> > > > between paging modes.
> > > > 
> > > > Please review and consider applying.
> > > 
> > > Ping?
> > 
> > Ingo, is there anything I can do to get review easier for you?
> 
> Yeah, what is the conclusion on the sub-discussion of patch #2:
> 
>   [PATCH 2/6] mm/zsmalloc: Prepare to variable MAX_PHYSMEM_BITS
> 
> ... do we want to skip it entirely and use the other 5 patches?

Sorry for the too much late reply, Kirill.
Yes, you can skip it.

As Nitin said in that patch's thread, zsmalloc has assumed
PFN_BIT is (BITS_PER_LONG - PAGE_SHIFT) so it already covers
X86_5LEVEL well, I think.

In summary, there is no need to change it.
I hope it helps to merge this patchset series.

Thanks.