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

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Date:   Wed, 7 Mar 2018 23:22:24 +0000
From:   "Kani, Toshi" <toshi.kani@....com>
To:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bp@...e.de" <bp@...e.de>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "guohanjun@...wei.com" <guohanjun@...wei.com>,
        "wxf.wang@...ilicon.com" <wxf.wang@...ilicon.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "x86@...nel.org" <x86@...nel.org>, "hpa@...or.com" <hpa@...or.com>,
        "will.deacon@....com" <will.deacon@....com>,
        "catalin.marinas@....com" <catalin.marinas@....com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "Hocko, Michal" <mhocko@...e.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 2/2] x86/mm: implement free pmd/pte page interfaces

On Wed, 2018-03-07 at 15:01 -0800, Andrew Morton wrote:
> On Wed,  7 Mar 2018 11:32:27 -0700 Toshi Kani <toshi.kani@....com> wrote:
> 
> > Implement pud_free_pmd_page() and pmd_free_pte_page() on x86, which
> > clear a given pud/pmd entry and free up lower level page table(s).
> > Address range associated with the pud/pmd entry must have been purged
> > by INVLPG.
> 
> OK, now we have implementations which match the naming ;) Again, is a
> cc:stable warranted?

Right. This patch 2/2 fixes the memory leak on x86.

Fixes: e61ce6ade404e ("mm: change ioremap to set up huge I/O mappings")

Patch 1/2 fixes the panic on arm64.

Fixes: 324420bf91f60 ("arm64: add support for ioremap() block mappings")

> Do you have any preferences/suggestions as to which tree these should
> be merged through?  You're hitting core, arm and x86.

No, I do not have any preference.

Thanks,
-Toshi