Dan Williams <dan.j.williams@xxxxxxxxx> writes: > [ drop Ross, add Kirill, linux-mm, and lkml ] > > On Tue, Dec 24, 2019 at 9:42 PM Murphy Zhou <jencce.kernel@xxxxxxxxx> wrote: >> >> By running xfstests with fsdax enabled, generic/437 always hits this >> warning[1] since this commit: >> >> commit 83d116c53058d505ddef051e90ab27f57015b025 >> Author: Jia He <justin.he@xxxxxxx> >> 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@xxxxxxxxxxxxxxx/T/#u
