linux-kernel - Re: [PATCH v2] mm: hwpoison: disable memory error handling on 1GB hugepage

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Message-Id: <20180208121749.0ac09af2b5a143106f339f55@linux-foundation.org>
Date:   Thu, 8 Feb 2018 12:17:49 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Punit Agrawal <punit.agrawal@....com>
Cc:     Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Anshuman Khandual <khandual@...ux.vnet.ibm.com>,
        "linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Ellerman <mpe@...erman.id.au>
Subject: Re: [PATCH v2] mm: hwpoison: disable memory error handling on 1GB
 hugepage

On Thu, 08 Feb 2018 12:30:45 +0000 Punit Agrawal <punit.agrawal@....com> wrote:

> >
> > So I don't think that the above test result means that errors are properly
> > handled, and the proposed patch should help for arm64.
> 
> Although, the deviation of pud_huge() avoids a kernel crash the code
> would be easier to maintain and reason about if arm64 helpers are
> consistent with expectations by core code.
> 
> I'll look to update the arm64 helpers once this patch gets merged. But
> it would be helpful if there was a clear expression of semantics for
> pud_huge() for various cases. Is there any version that can be used as
> reference?

Is that an ack or tested-by?

Mike keeps plaintively asking the powerpc developers to take a look,
but they remain steadfastly in hiding.

Folks, this patch fixes a BUG and is marked for -stable.  Can we please
prioritize it?