[PATCH v5 07/13] iommufd/viommu: Add iommufd_viommu_find_dev helper

[Tian, Kevin]

> From: Nicolin Chen <nicolinc at nvidia.com>
> Sent: Monday, October 28, 2024 6:49 AM
> 
> On Sun, Oct 27, 2024 at 11:02:31PM +0800, Zhangfei Gao wrote:
> > On Sat, 26 Oct 2024 at 07:51, Nicolin Chen <nicolinc at nvidia.com> wrote:
> > > +/* Caller should xa_lock(&viommu->vdevs) to protect the return value
> */
> > > +struct device *iommufd_viommu_find_dev(struct iommufd_viommu
> *viommu,
> > > +                                      unsigned long vdev_id)
> > > +{
> > > +       struct iommufd_vdevice *vdev;
> > > +
> > > +       lockdep_is_held(&viommu->vdevs.xa_lock);
> > > +
> > > +       vdev = xa_load(&viommu->vdevs, vdev_id);
> > > +       return vdev ? vdev->idev->dev : NULL;
> > > +}
> >
> > Got this error?
> >
> > ld: Unexpected GOT/PLT entries detected!
> > ld: Unexpected run-time procedure linkages detected!
> > ld: drivers/iommu/iommufd/driver.o: in function
> `iommufd_viommu_find_dev':
> > linux/drivers/iommu/iommufd/driver.c:47: undefined reference to
> > `lockdep_is_held'
> > make[2]: *** [scripts/Makefile.vmlinux:34: vmlinux] Error 1
> > make[1]: *** [/home/linaro/iommufd/linux/Makefile:1166: vmlinux] Error
> 2
> > make: *** [Makefile:224: __sub-make] Error 2
> 
> Should fix it with:
> -	lockdep_is_held(&viommu->vdevs.xa_lock);
> +	lockdep_assert_held(&viommu->vdevs.xa_lock);
> 

with that,

Reviewed-by: Kevin Tian <kevin.tian at intel.com>