Netdev Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Yunsheng Lin <linyunsheng@huawei.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>,
	"Michael S. Tsirkin" <mst@redhat.com>
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	"David S. Miller" <davem@davemloft.net>,
	Jakub Kicinski <kuba@kernel.org>,
	Jason Wang <jasowang@redhat.com>, Nick Hu <nickhu@andestech.com>,
	Greentime Hu <green.hu@gmail.com>,
	Vincent Chen <deanbo422@gmail.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Yury Norov <yury.norov@gmail.com>,
	Miguel Ojeda <ojeda@kernel.org>, <ndesaulniers@gooogle.com>,
	Joe Perches <joe@perches.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	<virtualization@lists.linux-foundation.org>,
	netdev <netdev@vger.kernel.org>
Subject: Re: [PATCH net-next 0/2] refactor the ringtest testing for ptr_ring
Date: Tue, 6 Jul 2021 09:35:18 +0800	[thread overview]
Message-ID: <b292ff2b-b21c-203e-dcae-70d9c39aed02@huawei.com> (raw)
In-Reply-To: <CAHp75VcsUxOqu48E1+RNqn=RhJqfd7XG8e3AKRHyMb3ywzSPrg@mail.gmail.com>

On 2021/7/6 3:05, Andy Shevchenko wrote:
> On Mon, Jul 5, 2021 at 9:45 PM Michael S. Tsirkin <mst@redhat.com> wrote:
>>
>> On Mon, Jul 05, 2021 at 09:36:26PM +0300, Andy Shevchenko wrote:
>>> On Mon, Jul 05, 2021 at 02:26:32PM -0400, Michael S. Tsirkin wrote:
>>>> On Mon, Jul 05, 2021 at 08:06:50PM +0800, Yunsheng Lin wrote:
>>>>> On 2021/7/5 17:56, Andy Shevchenko wrote:
>>>>>> On Mon, Jul 05, 2021 at 11:57:33AM +0800, Yunsheng Lin wrote:
>>>>>>> tools/include/* have a lot of abstract layer for building
>>>>>>> kernel code from userspace, so reuse or add the abstract
>>>>>>> layer in tools/include/ to build the ptr_ring for ringtest
>>>>>>> testing.
>>>>>>
>>>>>> ...
>>>>>>
>>>>>>>  create mode 100644 tools/include/asm/cache.h
>>>>>>>  create mode 100644 tools/include/asm/processor.h
>>>>>>>  create mode 100644 tools/include/generated/autoconf.h
>>>>>>>  create mode 100644 tools/include/linux/align.h
>>>>>>>  create mode 100644 tools/include/linux/cache.h
>>>>>>>  create mode 100644 tools/include/linux/slab.h
>>>>>>
>>>>>> Maybe somebody can change this to be able to include in-tree headers directly?
>>>>>
>>>>> If the above works, maybe the files in tools/include/* is not
>>>>> necessary any more, just use the in-tree headers to compile
>>>>> the user space app?
>>>>>
>>>>> Or I missed something here?
>>>>
>>>> why would it work? kernel headers outside of uapi are not
>>>> intended to be consumed by userspace.
>>>
>>> The problem here, that we are almost getting two copies of the headers, and
>>> tools are not in a good maintenance, so it's often desynchronized from the
>>> actual Linux headers. This will become more and more diverse if we keep same
>>> way of operation. So, I would rather NAK any new copies of the headers from
>>> include/ to tools/include.
>>
>> We already have the copies
>> yes they are not maintained well ... what's the plan then?
>> NAK won't help us improve the situation.
> 
> I understand and the proposal is to leave only the files which are not
> the same (can we do kinda wrappers or so in tools/include rather than
> copying everything?).

I am not sure the proposal is the right direction.
As mentioned by Michael, kernel headers outside of uapi are not
intended to be consumed by userspace, so those header might be
changed without considering of the code using them in tools/,
using the wrappers might cause more breaking of tools/.
And grepping through the tools/include does not seems to be
a lot of wrapper(only some low level asm include file like
tools/include/asm/barrier.h has the wrapper, which is supposed
not to be changed very often?)
so using wrappers does not seem to be the best choice here.

> 
>> I would say copies are kind of okay just make sure they are
>> built with kconfig. Then any breakage will be
>> detected.
>>
>>>>>> Besides above, had you tested this with `make O=...`?
>>>>>
>>>>> You are right, the generated/autoconf.h is in another directory
>>>>> with `make O=...`.
>>>>>
>>>>> Any nice idea to fix the above problem?
> 
> 

      parent reply	other threads:[~2021-07-06  1:36 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-05  3:57 Yunsheng Lin
2021-07-05  3:57 ` [PATCH net-next 1/2] tools: add missing infrastructure for building ptr_ring.h Yunsheng Lin
2021-07-05 18:39   ` Michael S. Tsirkin
2021-07-06  2:04     ` Yunsheng Lin
2021-07-18  2:09       ` Michael S. Tsirkin
2021-07-19  1:40         ` Yunsheng Lin
2021-07-19 11:58           ` Michael S. Tsirkin
2021-07-05  3:57 ` [PATCH net-next 2/2] tools/virtio: use common infrastructure to build ptr_ring.h Yunsheng Lin
2021-07-05  9:56 ` [PATCH net-next 0/2] refactor the ringtest testing for ptr_ring Andy Shevchenko
2021-07-05 12:06   ` Yunsheng Lin
2021-07-05 14:57     ` Andy Shevchenko
2021-07-05 18:26     ` Michael S. Tsirkin
2021-07-05 18:36       ` Andy Shevchenko
2021-07-05 18:42         ` Michael S. Tsirkin
2021-07-05 19:05           ` Andy Shevchenko
2021-07-05 19:31             ` Michael S. Tsirkin
2021-07-06  1:35             ` Yunsheng Lin [this message]

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=b292ff2b-b21c-203e-dcae-70d9c39aed02@huawei.com \
    --to=linyunsheng@huawei.com \
    --cc=akpm@linux-foundation.org \
    --cc=andriy.shevchenko@linux.intel.com \
    --cc=andy.shevchenko@gmail.com \
    --cc=davem@davemloft.net \
    --cc=deanbo422@gmail.com \
    --cc=green.hu@gmail.com \
    --cc=jasowang@redhat.com \
    --cc=joe@perches.com \
    --cc=kuba@kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mst@redhat.com \
    --cc=ndesaulniers@gooogle.com \
    --cc=netdev@vger.kernel.org \
    --cc=nickhu@andestech.com \
    --cc=ojeda@kernel.org \
    --cc=virtualization@lists.linux-foundation.org \
    --cc=yury.norov@gmail.com \
    --subject='Re: [PATCH net-next 0/2] refactor the ringtest testing for ptr_ring' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).