linux-kernel - Re: [PATCH v3 15/15] Drivers: hv: Add modules to expose /dev/mshv to VMMs running on Hyper-V

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Message-ID: <2023092614-tummy-dwelling-7063@gregkh>
Date:   Tue, 26 Sep 2023 08:31:03 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Wei Liu <wei.liu@...nel.org>
Cc:     Nuno Das Neves <nunodasneves@...ux.microsoft.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        x86@...nel.org, linux-arm-kernel@...ts.infradead.org,
        linux-arch@...r.kernel.org, patches@...ts.linux.dev,
        mikelley@...rosoft.com, kys@...rosoft.com, haiyangz@...rosoft.com,
        decui@...rosoft.com, apais@...ux.microsoft.com,
        Tianyu.Lan@...rosoft.com, ssengar@...ux.microsoft.com,
        mukeshrathor@...rosoft.com, stanislav.kinsburskiy@...il.com,
        jinankjain@...ux.microsoft.com, vkuznets@...hat.com,
        tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
        dave.hansen@...ux.intel.com, hpa@...or.com, will@...nel.org,
        catalin.marinas@....com
Subject: Re: [PATCH v3 15/15] Drivers: hv: Add modules to expose /dev/mshv to
 VMMs running on Hyper-V

On Tue, Sep 26, 2023 at 05:54:34AM +0000, Wei Liu wrote:
> On Tue, Sep 26, 2023 at 06:52:46AM +0200, Greg KH wrote:
> > On Mon, Sep 25, 2023 at 05:07:24PM -0700, Nuno Das Neves wrote:
> > > On 9/23/2023 12:58 AM, Greg KH wrote:
> > > > Also, drivers should never call pr_*() calls, always use the proper
> > > > dev_*() calls instead.
> > > > 
> > > 
> > > We only use struct device in one place in this driver, I think that is the
> > > only place it makes sense to use dev_*() over pr_*() calls.
> > 
> > Then the driver needs to be fixed to use struct device properly so that
> > you do have access to it when you want to print messages.  That's a
> > valid reason to pass around your device structure when needed.
> 
> Greg, ACRN and Nitro drivers do not pass around the device structure.
> Instead, they rely on a global struct device. We can follow the same.

A single global struct device is wrong, please don't do that.

Don't copy bad design patterns from other drivers, be better :)

thanks,

greg k-h