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Date:   Tue, 18 Aug 2020 20:26:19 -0700
From:   Andrew Morton <akpm@linux-foundation.org>
To:     <wuyun.wu@huawei.com>
Cc:     Christoph Lameter <cl@linux.com>,
        Pekka Enberg <penberg@kernel.org>,
        "David Rientjes" <rientjes@google.com>,
        Joonsoo Kim <iamjoonsoo.kim@lge.com>, <hewenliang4@huawei.com>,
        <hushiyuan@huawei.com>,
        "open list:SLAB ALLOCATOR" <linux-mm@kvack.org>,
        "open list" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] mm/slub: sysfs cleanup on cpu partial when
 !SLUB_CPU_PARTIAL
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On Thu, 13 Aug 2020 16:48:54 +0800 <wuyun.wu@huawei.com> wrote:

> Hide cpu partial related sysfs entries when !CONFIG_SLUB_CPU_PARTIAL to
> avoid confusion.
> 

But it changes the userspace interface in ways which might cause
existing code to misbehave?

We just had to revert a different commit for this reason :(

http://lkml.kernel.org/r/20200811075412.12872-1-bhe@redhat.com