linux-kernel - RE: [PATCH v5 03/29] iommu: Apply the new iommufd_object_alloc

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Message-ID: <BN9PR11MB5276FD88B84112B9807DA0238C67A@BN9PR11MB5276.namprd11.prod.outlook.com>
Date: Wed, 28 May 2025 08:11:06 +0000
From: "Tian, Kevin" <kevin.tian@...el.com>
To: Nicolin Chen <nicolinc@...dia.com>
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Subject: RE: [PATCH v5 03/29] iommu: Apply the new iommufd_object_alloc_ucmd
 helper

> From: Nicolin Chen <nicolinc@...dia.com>
> Sent: Saturday, May 24, 2025 5:35 AM
> 
> On Fri, May 23, 2025 at 07:49:40AM +0000, Tian, Kevin wrote:
> > > From: Nicolin Chen <nicolinc@...dia.com>
> > > Sent: Sunday, May 18, 2025 11:21 AM
> > >
> > > Now the new ucmd-based object allocator eases the finalize/abort
> routine,
> > > apply this to all existing allocators that aren't protected by any lock.
> > >
> > > Upgrade the for-driver vIOMMU alloctor too, and pass down to all
> existing
> > > viommu_alloc op accordingly.
> > >
> > > Note that __iommufd_object_alloc_ucmd() builds in some static tests that
> > > cover both static_asserts in the iommufd_viommu_alloc(). Thus drop
> them.
> >
> > I may overlook something, but at a quick glance the following check
> > Is not covered?
> >
> > -		static_assert(__same_type(struct iommufd_viommu,
> \
> > -					  ((drv_struct *)NULL)->member));
> \
> 
> The container_of() inside __iommufd_object_alloc_ucmd() covers that:
> 
> #define container_of(ptr, type, member) ({				\
> 	void *__mptr = (void *)(ptr);					\
> 	static_assert(__same_type(*(ptr), ((type *)0)->member) ||	\
> <<== here
> 		      __same_type(*(ptr), void),			\
> 		      "pointer type mismatch in container_of()");	\
> 	((type *)(__mptr - offsetof(type, member))); })

Yeah it's there.