linux-kernel - Re: [PATCH] tools/virtio: fix the vringh test for virtio ring changes

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Date:   Wed, 21 Dec 2022 18:15:43 +0900
From:   Shunsuke Mie <mie@...l.co.jp>
To:     Stefano Garzarella <sgarzare@...hat.com>
Cc:     "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>,
        Eugenio Pérez <eperezma@...hat.com>,
        linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org
Subject: Re: [PATCH] tools/virtio: fix the vringh test for virtio ring changes

Thank you for your quick response.

On 2022/12/21 18:13, Stefano Garzarella wrote:
> On Wed, Dec 21, 2022 at 04:55:06PM +0900, Shunsuke Mie wrote:
>> Fix the build caused by missing kmsan_handle_dma() and 
>> is_power_of_2() that
>> are used in drivers/virtio/virtio_ring.c.
>>
>> Signed-off-by: Shunsuke Mie <mie@...l.co.jp>
>> ---
>> tools/virtio/linux/cpumask.h  |  7 +++++++
>> tools/virtio/linux/gfp.h      |  7 +++++++
>> tools/virtio/linux/kernel.h   |  1 +
>> tools/virtio/linux/kmsan.h    | 12 ++++++++++++
>> tools/virtio/linux/log2.h     | 11 +++++++++++
>> tools/virtio/linux/topology.h |  7 +++++++
>> 6 files changed, 45 insertions(+)
>> create mode 100644 tools/virtio/linux/cpumask.h
>> create mode 100644 tools/virtio/linux/gfp.h
>> create mode 100644 tools/virtio/linux/kmsan.h
>> create mode 100644 tools/virtio/linux/log2.h
>> create mode 100644 tools/virtio/linux/topology.h
>>
>> diff --git a/tools/virtio/linux/cpumask.h b/tools/virtio/linux/cpumask.h
>> new file mode 100644
>> index 000000000000..307da69d6b26
>> --- /dev/null
>> +++ b/tools/virtio/linux/cpumask.h
>> @@ -0,0 +1,7 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _LINUX_CPUMASK_H
>> +#define _LINUX_CPUMASK_H
>> +
>> +#include <linux/kernel.h>
>> +
>> +#endif /* _LINUX_CPUMASK_H */
>> diff --git a/tools/virtio/linux/gfp.h b/tools/virtio/linux/gfp.h
>> new file mode 100644
>> index 000000000000..43d146f236f1
>> --- /dev/null
>> +++ b/tools/virtio/linux/gfp.h
>> @@ -0,0 +1,7 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef __LINUX_GFP_H
>> +#define __LINUX_GFP_H
>> +
>> +#include <linux/topology.h>
>> +
>> +#endif
>> diff --git a/tools/virtio/linux/kernel.h b/tools/virtio/linux/kernel.h
>> index 21593bf97755..8b877167933d 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/log2.h>
>> #include <linux/types.h>
>> #include <linux/overflow.h>
>> #include <linux/list.h>
>> diff --git a/tools/virtio/linux/kmsan.h b/tools/virtio/linux/kmsan.h
>> new file mode 100644
>> index 000000000000..272b5aa285d5
>> --- /dev/null
>> +++ b/tools/virtio/linux/kmsan.h
>> @@ -0,0 +1,12 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +#ifndef _LINUX_KMSAN_H
>> +#define _LINUX_KMSAN_H
>> +
>> +#include <linux/gfp.h>
>> +
>> +inline void kmsan_handle_dma(struct page *page, size_t offset, 
>> size_t size,
>> +                 enum dma_data_direction dir)
>> +{
>> +}
>> +
>> +#endif /* _LINUX_KMSAN_H */
>> diff --git a/tools/virtio/linux/log2.h b/tools/virtio/linux/log2.h
>> new file mode 100644
>> index 000000000000..aa67bb21d8e2
>> --- /dev/null
>> +++ b/tools/virtio/linux/log2.h
>> @@ -0,0 +1,11 @@
>> +/* SPDX-License-Identifier: GPL-2.0 */
>> +
>> +#ifndef _LINUX_LOG2_H
>> +#define _LINUX_LOG2_H
>> +
>> +inline bool is_power_of_2(unsigned long n)
>> +{
>> +    return true;
>> +}
>
> is_power_of_2 seems defined in tools/include/linux/log2.h so
> `#include <linux/log2.h>` in tools/virtio/linux/kernel.h should be
> enough.
>
> If that's not the case, however, I think we should return true here only
> if n is really power of 2.
I'm going to check and try those.
> Thanks,
> Stefano
>
Best,

Shunsuke