linux-kernel - Re: [PATCH v10 2/3] powerpc: Use cpu_smallcore_sibling

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Message-Id: <20181012070000.GB28228@linux.vnet.ibm.com>
Date:   Fri, 12 Oct 2018 12:30:00 +0530
From:   Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:     "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
Cc:     Dave Hansen <dave.hansen@...el.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Michael Neuling <mikey@...ling.org>,
        Vaidyanathan Srinivasan <svaidy@...ux.vnet.ibm.com>,
        Akshay Adiga <akshay.adiga@...ux.vnet.ibm.com>,
        Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>,
        "Oliver O'Halloran" <oohall@...il.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Murilo Opsfelder Araujo <muriloo@...ux.ibm.com>,
        Anton Blanchard <anton@...ba.org>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v10 2/3] powerpc: Use cpu_smallcore_sibling_mask at SMT
 level on bigcores

* Gautham R. Shenoy <ego@...ux.vnet.ibm.com> [2018-10-11 11:03:02]:

> From: "Gautham R. Shenoy" <ego@...ux.vnet.ibm.com>
> 
> 
> +#ifdef CONFIG_SCHED_SMT
> +	if (has_big_cores) {
> +		pr_info("Using small cores at SMT level\n");
> +		power9_topology[0].mask = smallcore_smt_mask;
> +		powerpc_topology[0].mask = smallcore_smt_mask;
> +	}
> +#endif
>  	/*

I dont see a way a system can have has_big_core set but use
powerpc_topology.