linux-kernel - Re: [PATCH v3 2/3] ioremap: Update pgtable free interfaces with addr

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Message-ID: <1526567449.2693.608.camel@hpe.com>
Date:   Thu, 17 May 2018 14:32:01 +0000
From:   "Kani, Toshi" <toshi.kani@....com>
To:     "mhocko@...nel.org" <mhocko@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "hpa@...or.com" <hpa@...or.com>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "cpandya@...eaurora.org" <cpandya@...eaurora.org>
Subject: Re: [PATCH v3 2/3] ioremap: Update pgtable free interfaces with addr

On Thu, 2018-05-17 at 08:47 +0200, Michal Hocko wrote:
> On Wed 16-05-18 17:32:06, Kani Toshimitsu wrote:
> > From: Chintan Pandya <cpandya@...eaurora.org>
> > 
> > This patch ("mm/vmalloc: Add interfaces to free unmapped
> > page table") adds following 2 interfaces to free the page
> > table in case we implement huge mapping.
> > 
> > pud_free_pmd_page() and pmd_free_pte_page()
> > 
> > Some architectures (like arm64) needs to do proper TLB
> > maintanance after updating pagetable entry even in map.
> > Why ? Read this,
> > https://patchwork.kernel.org/patch/10134581/
> 
> Please add that information to the changelog.

I will update the description and resend this patch.

Thanks!
-Toshi