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From: Dan Williams <>
To: Murphy Zhou <>
Cc: linux-nvdimm <>,
	Jia He <>, Linux MM <>,
	"Shutemov, Kirill" <>,
	Linux Kernel Mailing List <>
Subject: Re: [PATCH] mm: get rid of WARN if failed to cow user pages
Date: Tue, 14 Jan 2020 22:02:34 -0800
Message-ID: <> (raw)
In-Reply-To: <>

[ drop Ross, add Kirill, linux-mm, and lkml ]

On Tue, Dec 24, 2019 at 9:42 PM Murphy Zhou <> wrote:
> By running xfstests with fsdax enabled, generic/437 always hits this
> warning[1] since this commit:
> commit 83d116c53058d505ddef051e90ab27f57015b025
> Author: Jia He <>
> Date:   Fri Oct 11 22:09:39 2019 +0800
>     mm: fix double page fault on arm64 if PTE_AF is cleared
> Looking at the test program[2] generic/437 uses, it's pretty easy
> to hit this warning. Remove this WARN as it seems not necessary.

This is not sufficient justification. Does this same test fail without
DAX? If not, why not? At a minimum you need to explain why this is not
indicating a problem.
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Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-25  5:42 Murphy Zhou
2019-12-25  8:17 ` Justin He
2019-12-26 10:53   ` Murphy Zhou
2020-01-15  4:48 ` Murphy Zhou
2020-01-15  6:02 ` Dan Williams [this message]

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