Re: [PATCH v3 05/15] iommufd: File descriptor, context, kconfig and makefiles

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On Wed, Oct 26, 2022 at 08:58:23PM +0800, Baolu Lu wrote:
> > +	[_IOC_NR(_ioctl) - IOMMUFD_CMD_BASE] = {                               \
> > +		.size = sizeof(_struct) +                                      \
> > +			BUILD_BUG_ON_ZERO(sizeof(union ucmd_buffer) <          \
> > +					  sizeof(_struct)),                    \
> > +		.min_size = offsetofend(_struct, _last),                       \
> > +		.ioctl_num = _ioctl,                                           \
> > +		.execute = _fn,                                                \
> > +	}
> > +static struct iommufd_ioctl_op iommufd_ioctl_ops[] = {
> 
> How about making the ops "static const"?

Yes both const's were missed

> > +static void __exit iommufd_exit(void)
> > +{
> > +	misc_deregister(&iommu_misc_dev);
> > +}
> > +
> > +module_init(iommufd_init);
> > +module_exit(iommufd_exit);
> > +
> > +MODULE_DESCRIPTION("I/O Address Space Management for passthrough devices");
> > +MODULE_LICENSE("GPL");
> 
> Could above be "GPL v2"?

It should be just "GPL", see Documentation/process/license-rules.rst:

    "GPL v2"                      Same as "GPL". It exists for historic

> > --- /dev/null
> > +++ b/include/uapi/linux/iommufd.h
> > @@ -0,0 +1,55 @@
> > +/* SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note */
> > +/* Copyright (c) 2021-2022, NVIDIA CORPORATION & AFFILIATES.
> > + */
> > +#ifndef _UAPI_IOMMUFD_H
> > +#define _UAPI_IOMMUFD_H
> > +
> > +#include <linux/types.h>
> > +#include <linux/ioctl.h>
> > +
> > +#define IOMMUFD_TYPE (';')
> > +
> > +/**
> > + * DOC: General ioctl format
> > + *
> > + * The ioctl mechanims follows a general format to allow for extensibility. Each
>                 ^^^^^^^^^ mechanism?

How about "interface" ?

Thanks,
Jason



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