Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20;
Date:   Mon, 25 Apr 2022 11:06:35 +0100
From:   Sudeep Holla <sudeep.holla@arm.com>
To:     Qing Wang <wangqing@vivo.com>
Cc:     Catalin Marinas <catalin.marinas@arm.com>,
        Will Deacon <will@kernel.org>,
        linux-arm-kernel@lists.infradead.org,
        Sudeep Holla <sudeep.holla@arm.com>,
        linux-kernel@vger.kernel.org, vincent.guittot@linaro.org,
        peterz@infradead.org, dietmar.eggemann@arm.com
Subject: Re: [PATCH V2] arm64: add SCHED_CLUSTER's dependency on ACPI
Message-ID: <20220425100635.ig4dxvlflglfagpx@bogus>
References: <1650855303-91388-1-git-send-email-wangqing@vivo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1650855303-91388-1-git-send-email-wangqing@vivo.com>
Precedence: bulk

On Sun, Apr 24, 2022 at 07:55:01PM -0700, Qing Wang wrote:
> From: Wang Qing <wangqing@vivo.com>
> 
> cluster sched_domain configured by cpu_topology[].cluster_sibling, 
> which is set by cluster_id, cluster_id can only get from ACPI.
> 
> If the system does not enable ACPI, cluster_id is always -1, even enable
> SCHED_CLUSTER is invalid, this is misleading. 
> 
> So we add SCHED_CLUSTER's dependency on ACPI here.
>

Any reason why this can't be extended to support DT based systems via
cpu-map in the device tree. IMO we almost have everything w.r.t topology
in DT and no reason to deviate this feature between ACPI and DT.

-- 
Regards,
Sudeep