linux-kernel - Re: [PATCH v8 2/2] x86/sgx: Add an attribute for the amount of SGX memory in a NUMA node

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Message-ID: <4050b7723f6f205c9afc3bdfa3888a6e8befa12a.camel@kernel.org>
Date:   Sat, 23 Oct 2021 04:02:48 +0300
From:   Jarkko Sakkinen <jarkko@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>,
        reinette.chatre@...el.com, tony.luck@...el.com,
        linux-kernel@...r.kernel.org, linux-sgx@...r.kernel.org
Subject: Re: [PATCH v8 2/2] x86/sgx: Add an attribute for the amount of SGX
 memory in a NUMA node

On Mon, 2021-10-18 at 16:35 +0200, Greg Kroah-Hartman wrote:
> > +               ret = sysfs_create_group(&dev->kobj, &sgx_node_attr_group);
> 
> A huge hint, if a driver has to call a sysfs_* call, something is wrong.
> 
> Something is wrong here.
> 
> Why are you messing around with a kobject?  This is a device, that you
> control, you can just set the default attribute group for it and then
> the driver core will add and remove the sysfs group at the proper time,
> in the proper way.  Right now you are racing userspace and loosing.
> 
> Use the default group list, that is what it is there for.

I used sysfs_create_group() because node_devices is not owned by SGX
code. It is managed in drivers/base/node.c, and also initialized before
SGX.

/Jarkko