Messages in this thread | | | From | Jeff Moyer <> | Subject | Re: [PATCH] mm: get rid of WARN if failed to cow user pages | Date | Tue, 18 Feb 2020 16:09:30 -0500 |
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Dan Williams <dan.j.williams@intel.com> writes:
> [ drop Ross, add Kirill, linux-mm, and lkml ] > > On Tue, Dec 24, 2019 at 9:42 PM Murphy Zhou <jencce.kernel@gmail.com> wrote: >> >> By running xfstests with fsdax enabled, generic/437 always hits this >> warning[1] since this commit: >> >> commit 83d116c53058d505ddef051e90ab27f57015b025 >> Author: Jia He <justin.he@arm.com> >> 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.
I ran into this, too, and Kirill has posted a patch[1] to fix the issue. Note that it's a potential data corrupter, so just removing the warning is NOT the right approach. :)
-Jeff
[1] https://lore.kernel.org/linux-mm/20200218154151.13349-1-kirill.shutemov@linux.intel.com/T/#u
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