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Date:   Wed, 17 Aug 2022 08:48:33 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Huang Ying <ying.huang@intel.com>
Cc:     linux-mm@kvack.org, linux-kernel@vger.kernel.org,
        Baolin Wang <baolin.wang@linux.alibaba.com>,
        Zi Yan <ziy@nvidia.com>, Yang Shi <shy828301@gmail.com>,
        Oscar Salvador <osalvador@suse.de>
Subject: Re: [PATCH -V3 0/8] migrate_pages(): fix several bugs in error path
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On Wed, 17 Aug 2022 16:14:00 +0800 Huang Ying <ying.huang@intel.com> wrote:

> error-inject.patch, test-migrate.c, and test-migrate.sh are as below.
> It turns out that error injection is an important tool to fix bugs in
> error path.

Indeed, and thanks for doing this.

Did you consider lib/*inject*.c?  If so, was it unsuitable?