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Date: Mon, 10 Apr 2023 20:01:27 +0900
From: Shunsuke Mie <mie@...l.co.jp>
To: "Michael S. Tsirkin" <mst@...hat.com>
Cc: Jason Wang <jasowang@...hat.com>,
Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Sakari Ailus <sakari.ailus@...ux.intel.com>,
"Rafael J. Wysocki" <rafael@...nel.org>,
"Matthew Wilcox (Oracle)" <willy@...radead.org>,
Stefano Garzarella <sgarzare@...hat.com>,
Eugenio Pérez <eperezma@...hat.com>,
linux-kernel@...r.kernel.org,
virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] tools/virtio: fix build caused by virtio_ring changes
On 2023/04/10 19:58, Michael S. Tsirkin wrote:
> On Mon, Apr 10, 2023 at 07:56:13PM +0900, Shunsuke Mie wrote:
>> On 2023/04/10 19:00, Shunsuke Mie wrote:
>>> On 2023/04/10 18:46, Michael S. Tsirkin wrote:
>>>> On Mon, Apr 10, 2023 at 06:24:19PM +0900, Shunsuke Mie wrote:
>>>>> Fix the build dependency for virtio_test. virtio_ring requires
>>>>> container_of_const() and struce device.
>>>>>
>>>>> Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
>>>>> ---
>>>>> tools/include/linux/container_of.h | 36
>>>>> ++++++++++++++++++++++++++++++
>>>>> tools/virtio/linux/compiler.h | 3 +++
>>>>> tools/virtio/linux/kernel.h | 5 +----
>>>>> tools/virtio/linux/module.h | 1 +
>>>>> 4 files changed, 41 insertions(+), 4 deletions(-)
>>>>> create mode 100644 tools/include/linux/container_of.h
>>>>>
>>>>> diff --git a/tools/include/linux/container_of.h
>>>>> b/tools/include/linux/container_of.h
>>>>> new file mode 100644
>>>>> index 000000000000..06e293b7cfda
>>>>> --- /dev/null
>>>>> +++ b/tools/include/linux/container_of.h
>>>>> @@ -0,0 +1,36 @@
>>>>> +/* SPDX-License-Identifier: GPL-2.0 */
>>>>> +#ifndef _LINUX_CONTAINER_OF_H
>>>>> +#define _LINUX_CONTAINER_OF_H
>>>>> +
>>>>> +#include <linux/build_bug.h>
>>>>> +#include <linux/stddef.h>
>>>>> +
>>>>> +/**
>>>>> + * container_of - cast a member of a structure out to the
>>>>> containing structure
>>>>> + * @ptr: the pointer to the member.
>>>>> + * @type: the type of the container struct this is embedded in.
>>>>> + * @member: the name of the member within the struct.
>>>>> + *
>>>>> + * WARNING: any const qualifier of @ptr is lost.
>>>>> + */
>>>>> +#define container_of(ptr, type, member) ({ \
>>>>> + void *__mptr = (void *)(ptr); \
>>>>> + static_assert(__same_type(*(ptr), ((type *)0)->member) || \
>>>>> + __same_type(*(ptr), void), \
>>>>> + "pointer type mismatch in container_of()"); \
>>>>> + ((type *)(__mptr - offsetof(type, member))); })
>>>>> +
>>>>> +/**
>>>>> + * container_of_const - cast a member of a structure out to the
>>>>> containing
>>>>> + * structure and preserve the const-ness of the pointer
>>>>> + * @ptr: the pointer to the member
>>>>> + * @type: the type of the container struct this is embedded in.
>>>>> + * @member: the name of the member within the struct.
>>>>> + */
>>>>> +#define container_of_const(ptr, type, member) \
>>>>> + _Generic(ptr, \
>>>>> + const typeof(*(ptr)) *: ((const type
>>>>> *)container_of(ptr, type, member)),\
>>>>> + default: ((type *)container_of(ptr, type, member)) \
>>>>> + )
>>>>> +
>>>>> +#endif /* _LINUX_CONTAINER_OF_H */
>>>> Please just do
>>>> #include "../../../include/linux/container_of.h"
>>>> instead.
>>> Okey, I'll do that.
>>>>
>>>>> diff --git a/tools/virtio/linux/compiler.h
>>>>> b/tools/virtio/linux/compiler.h
>>>>> index 2c51bccb97bb..ac27b3ea6e67 100644
>>>>> --- a/tools/virtio/linux/compiler.h
>>>>> +++ b/tools/virtio/linux/compiler.h
>>>>> @@ -8,4 +8,7 @@
>>>>> #define READ_ONCE(var) (*((volatile typeof(var) *)(&(var))))
>>>>> #define __aligned(x) __attribute((__aligned__(x)))
>>>>> +
>>>>> +#define __same_type(a, b)
>>>>> __builtin_types_compatible_p(typeof(a), typeof(b))
>>>>> +
>>>>> #endif
>>>> #include "../../../include/linux/compiler_types.h" instead?
>>> I'll try it.
>>>>> diff --git a/tools/virtio/linux/kernel.h b/tools/virtio/linux/kernel.h
>>>>> index 8b877167933d..3cd20cb92649 100644
>>>>> --- a/tools/virtio/linux/kernel.h
>>>>> +++ b/tools/virtio/linux/kernel.h
>>>>> @@ -10,6 +10,7 @@
>>>>> #include <stdarg.h>
>>>>> #include <linux/compiler.h>
>>>>> +#include <linux/container_of.h>
>>>>> #include <linux/log2.h>
>>>>> #include <linux/types.h>
>>>>> #include <linux/overflow.h>
>>>>> @@ -107,10 +108,6 @@ static inline void free_page(unsigned long addr)
>>>>> free((void *)addr);
>>>>> }
>>>>> -#define container_of(ptr, type, member) ({ \
>>>>> - const typeof( ((type *)0)->member ) *__mptr = (ptr); \
>>>>> - (type *)( (char *)__mptr - offsetof(type,member) );})
>>>>> -
>>>>> # ifndef likely
>>>>> # define likely(x) (__builtin_expect(!!(x), 1))
>>>>> # endif
>>>>> diff --git a/tools/virtio/linux/module.h b/tools/virtio/linux/module.h
>>>>> index 9dfa96fea2b2..e2e791dbd104 100644
>>>>> --- a/tools/virtio/linux/module.h
>>>>> +++ b/tools/virtio/linux/module.h
>>>>> @@ -5,3 +5,4 @@
>>>>> static __attribute__((unused)) const char
>>>>> *__MODULE_LICENSE_name = \
>>>>> __MODULE_LICENSE_value
>>>>> +struct device;
>>>> It's not there in include/linux/module - pls put it in the
>>>> same here where it is for linux.
>>> I understood. I'll add some files that has the definition.
>> In vringh.c, 'struct device' is used in virtio_ring.h. Upon investigating
>> the preprocessed file, it was
>>
>> discovered that 'struct device' is defined in bitmap.h, which is included
>> from architecture-specific headers.
>>
>> On x86, the nesting includes
>>
>> 'linux/module.h' -> ... -> 'arch/x86/include/asm/msr.h' ->
>> 'arch/x86/include/asm/cpumask.h' -> 'linux/cpumask.h' -> 'linux/bitmap.h'.
>>
>> Could you advise on the appropriate way to include this file?
> Let's just add struct device; in virtio_ring.h, make it
> self-sufficient.
>
I agree. Thanks a lot.
>>>>> --
>>>>> 2.25.1
>>> Best regards,
>>>
>>> Shunsuke.
>>>
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