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Subject: Re: [PATCH v2 0/3] topology/sysfs: only export used sysfs attributes
To:     "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Heiko Carstens <hca@linux.ibm.com>
Cc:     Peter Zijlstra <peterz@infradead.org>,
        "Rafael J . Wysocki" <rafael@kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
        Jonathan Cameron <jonathan.cameron@huawei.com>,
        Len Brown <len.brown@intel.com>,
        Thomas Richter <tmricht@linux.ibm.com>,
        Ian Rogers <irogers@google.com>
References: <20211129130309.3256168-1-hca@linux.ibm.com>
 <YaTdpsVCDQMlscON@hirez.programming.kicks-ass.net> <YajWjasdqnibSRJm@osiris>
 <YajXnjVGEWeUmEqA@kroah.com> <60d13e6233df4aa78494bb51a2792bbe@hisilicon.com>
From:   Brice Goglin <Brice.Goglin@inria.fr>
Message-ID: <63384337-ba36-9b2a-c9ae-75e3f5ac02d7@inria.fr>
Date:   Sat, 4 Dec 2021 10:48:10 +0100
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From: Brice Goglin <Brice.Goglin@inria.fr>
To: "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
 Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
 Heiko Carstens <hca@linux.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>,
 "Rafael J . Wysocki" <rafael@kernel.org>,
 Andrew Morton <akpm@linux-foundation.org>,
 "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
 Jonathan Cameron <jonathan.cameron@huawei.com>,
 Len Brown <len.brown@intel.com>, Thomas Richter <tmricht@linux.ibm.com>,
 Ian Rogers <irogers@google.com>
Message-ID: <63384337-ba36-9b2a-c9ae-75e3f5ac02d7@inria.fr>
Subject: Re: [PATCH v2 0/3] topology/sysfs: only export used sysfs attributes
References: <20211129130309.3256168-1-hca@linux.ibm.com>
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Le 04/12/2021 =C3=A0 10:07, Song Bao Hua (Barry Song) a =C3=A9crit=C2=A0:=

>
> Could you give me one minute?
>
> +Brice
>
> I'd like to hear some feedbacks from hwloc if there
> is a chance to break userspace and if userspace depends
> on the existence of sysfs even though the topology
> doesn't exist.
>
> If no, I feel it is safe to take.
>

Hello

If the question is whether hwloc *requires* cluster/die/book/drawer=20
sysfs files to exist, then the answer is no. We have to support old=20
kernels without those files anyway.

Brice


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