linux-kernel - Re: [PATCH v6 04/12] x86/sgx: Implement basic EPC misc cgroup functionality

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Message-ID: <9f4374bcab0ffba024204d97a2bf1f3a1128bdd5.camel@intel.com>
Date:   Mon, 6 Nov 2023 22:23:52 +0000
From:   "Huang, Kai" <kai.huang@...el.com>
To:     "hpa@...or.com" <hpa@...or.com>,
        "linux-sgx@...r.kernel.org" <linux-sgx@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "jarkko@...nel.org" <jarkko@...nel.org>,
        "cgroups@...r.kernel.org" <cgroups@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mkoutny@...e.com" <mkoutny@...e.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "haitao.huang@...ux.intel.com" <haitao.huang@...ux.intel.com>,
        "Mehta, Sohil" <sohil.mehta@...el.com>,
        "tj@...nel.org" <tj@...nel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>
CC:     "mikko.ylinen@...ux.intel.com" <mikko.ylinen@...ux.intel.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "Zhang, Bo" <zhanb@...rosoft.com>,
        "kristen@...ux.intel.com" <kristen@...ux.intel.com>,
        "yangjie@...rosoft.com" <yangjie@...rosoft.com>,
        "sean.j.christopherson@...el.com" <sean.j.christopherson@...el.com>,
        "Li, Zhiquan1" <zhiquan1.li@...el.com>,
        "anakrish@...rosoft.com" <anakrish@...rosoft.com>
Subject: Re: [PATCH v6 04/12] x86/sgx: Implement basic EPC misc cgroup
 functionality

On Mon, 2023-10-30 at 11:20 -0700, Haitao Huang wrote:
> +static int __init sgx_epc_cgroup_init(void)
> +{
> +	struct misc_cg *cg;
> +
> +	if (!boot_cpu_has(X86_FEATURE_SGX))
> +		return 0;
> +
> +	cg = misc_cg_root();
> +	BUG_ON(!cg);
> +
> +	return sgx_epc_cgroup_alloc(cg);
> +}
> +subsys_initcall(sgx_epc_cgroup_init);

This should be called from sgx_init(), which is the place to init SGX related
staff.  In case you didn't notice, sgx_init() is actually device_initcall(),
which is actually called _after_ the subsys_initcall() you used above.