linux-kernel - Re: [PATCH 6/7] Revert "iommu/arm-smmu: Make arm-smmu explicitly non-modular"

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Date:   Thu, 31 Oct 2019 12:03:28 +0000
From:   Will Deacon <will@...nel.org>
To:     iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Robin Murphy <robin.murphy@....com>
Subject: Re: [PATCH 6/7] Revert "iommu/arm-smmu: Make arm-smmu explicitly
 non-modular"

On Wed, Oct 30, 2019 at 05:09:41PM -0600, Jordan Crouse wrote:
> On Wed, Oct 30, 2019 at 02:51:11PM +0000, Will Deacon wrote:
> > @@ -2235,12 +2237,16 @@ static const struct dev_pm_ops arm_smmu_pm_ops = {
> >  
> >  static struct platform_driver arm_smmu_driver = {
> >  	.driver	= {
> > -		.name			= "arm-smmu",
> > -		.of_match_table		= of_match_ptr(arm_smmu_of_match),
> > -		.pm			= &arm_smmu_pm_ops,
> > -		.suppress_bind_attrs	= true,
> > +		.name		= "arm-smmu",
> > +		.of_match_table	= of_match_ptr(arm_smmu_of_match),
> > +		.pm		= &arm_smmu_pm_ops,
> >  	},
> >  	.probe	= arm_smmu_device_probe,
> > +	.remove	= arm_smmu_device_remove,
> >  	.shutdown = arm_smmu_device_shutdown,
> >  };
> > -builtin_platform_driver(arm_smmu_driver);
> > +module_platform_driver(arm_smmu_driver);
> 
> I know this is a revert, but wouldn't you still want to be at device_init()
> level for built in drivers? It always preferable to not defer if given the
> choice to do so and device_init() is the right level for this driver IMO.

Hmm, not sure I'm following you completely here. With this change,
module_init() is used to invoke platform_driver_register(). For builtin
drivers, module_initx() expands to __initcall(x), which itself expands
to device_initcall(x). Or are you referrring to something else?

Will