linux-kernel - Re: [PATCH v2 2/2] x86/mm: implement free pmd/pte page interfaces

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Message-ID: <20180427114619.GV15462@8bytes.org>
Date:   Fri, 27 Apr 2018 13:46:19 +0200
From:   "joro@...tes.org" <joro@...tes.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     "Kani, Toshi" <toshi.kani@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bp@...e.de" <bp@...e.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "guohanjun@...wei.com" <guohanjun@...wei.com>,
        "wxf.wang@...ilicon.com" <wxf.wang@...ilicon.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "willy@...radead.org" <willy@...radead.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "will.deacon@....com" <will.deacon@....com>,
        "cpandya@...eaurora.org" <cpandya@...eaurora.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH v2 2/2] x86/mm: implement free pmd/pte page interfaces

On Fri, Apr 27, 2018 at 01:39:23PM +0200, Michal Hocko wrote:
> On Fri 27-04-18 09:37:20, joro@...tes.org wrote:
> [...]
> > So until we make the generic ioremap code in lib/ioremap.c smarter about
> > unmapping/remapping ranges the best solution is making my fix work again
> > by reverting your patch.
> 
> Could you reuse the same mmu_gather mechanism as we use in the
> zap_*_range?

Yeah, maybe, I havn't looked into the details yet. At least something
similar is needed.


	Joerg