linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	Oded Gabbay <oded.gabbay@gmail.com>,
	Dave Airlie <airlied@gmail.com>,
	dri-devel <dri-devel@lists.freedesktop.org>,
	Yuji Ishikawa <yuji2.ishikawa@toshiba.co.jp>,
	Jiho Chu <jiho.chu@samsung.com>, Arnd Bergmann <arnd@arndb.de>,
	"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>
Subject: Re: New subsystem for acceleration devices
Date: Tue, 9 Aug 2022 10:45:42 +0200	[thread overview]
Message-ID: <YvIethFMeGyljdVV@kroah.com> (raw)
In-Reply-To: <YvIU/wMdqFA1fYc6@infradead.org>

On Tue, Aug 09, 2022 at 01:04:15AM -0700, Christoph Hellwig wrote:
> On Tue, Aug 09, 2022 at 08:23:27AM +0200, Greg Kroah-Hartman wrote:
> > Based on the number of drivers that I see submitted weekly that try to
> > restrict their open call to just one user by using atomic variables or
> > other tricks, I think my interpretation of this stands :)
> 
> I think they really want what Jason described most of the time.  They
> just don't know about the pitfalls of dup yet.
> 
> > > This is different from the number of FDs pointing at the struct file.
> > > Userpsace can open a HW state and point a lot of FDs at it, that is
> > > userspace's problem. From a kernel view they all share one struct file
> > > and thus one HW state.
> > 
> > Yes, that's fine, if that is what is happening here, I have no
> > objection.
> 
> It would be great if we could actually life that into a common
> layer (chardev or vfs) given just how common this, and drivers tend
> to get it wrong, do it suboptimal so often.

No objection from me, I'll gladly take patches to chardev or miscdev to
support this.

greg k-h

  parent reply	other threads:[~2022-08-09  8:45 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20220731114605epcas1p1afff6b948f542e2062b60d49a8023f6f@epcas1p1.samsung.com>
2022-07-31 11:45 ` New subsystem for acceleration devices Oded Gabbay
2022-07-31 15:37   ` Greg Kroah-Hartman
2022-08-01  2:29     ` yuji2.ishikawa
2022-08-01  8:21       ` Oded Gabbay
2022-08-03  4:39         ` yuji2.ishikawa
2022-08-03  5:34           ` Greg KH
2022-08-03 20:28           ` Oded Gabbay
2022-08-02 17:25   ` Jiho Chu
2022-08-02 19:07     ` Oded Gabbay
2022-08-03 19:04   ` Dave Airlie
2022-08-03 20:20     ` Oded Gabbay
2022-08-03 23:31       ` Daniel Stone
2022-08-04  6:46         ` Oded Gabbay
2022-08-04  9:27           ` Jiho Chu
2022-08-03 23:54       ` Dave Airlie
2022-08-04  7:43         ` Oded Gabbay
2022-08-04 14:50           ` Jason Gunthorpe
2022-08-04 17:48             ` Oded Gabbay
2022-08-05  0:22               ` Jason Gunthorpe
2022-08-07  6:43                 ` Oded Gabbay
2022-08-07 11:25                   ` Oded Gabbay
2022-08-08  6:10                     ` Greg Kroah-Hartman
2022-08-08 17:55                       ` Jason Gunthorpe
2022-08-09  6:23                         ` Greg Kroah-Hartman
2022-08-09  8:04                           ` Christoph Hellwig
2022-08-09  8:32                             ` Arnd Bergmann
2022-08-09 12:18                               ` Jason Gunthorpe
2022-08-09 12:46                                 ` Arnd Bergmann
2022-08-09 14:22                                   ` Jason Gunthorpe
2022-08-09  8:45                             ` Greg Kroah-Hartman [this message]
2022-08-08 17:46                   ` Jason Gunthorpe
2022-08-08 20:26                     ` Oded Gabbay
2022-08-09 12:43                       ` Jason Gunthorpe
2022-08-05  3:02           ` Dave Airlie
2022-08-07  6:50             ` Oded Gabbay
2022-08-09 21:42               ` Oded Gabbay
2022-08-10  9:00                 ` Jiho Chu
2022-08-10 14:05                 ` yuji2.ishikawa
2022-08-10 14:37                   ` Oded Gabbay
2022-08-23 18:23                 ` Kevin Hilman
2022-08-23 20:45                   ` Oded Gabbay
2022-08-29 20:54                     ` Kevin Hilman
2022-09-23 16:21                       ` Oded Gabbay
2022-09-26  8:16                         ` Christoph Hellwig
2022-09-29  6:50                           ` Oded Gabbay
2022-08-04 12:00         ` Tvrtko Ursulin
2022-08-04 15:03           ` Jeffrey Hugo
2022-08-04 17:53             ` Oded Gabbay

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=YvIethFMeGyljdVV@kroah.com \
    --to=gregkh@linuxfoundation.org \
    --cc=airlied@gmail.com \
    --cc=arnd@arndb.de \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=hch@infradead.org \
    --cc=jgg@nvidia.com \
    --cc=jiho.chu@samsung.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=oded.gabbay@gmail.com \
    --cc=yuji2.ishikawa@toshiba.co.jp \
    /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
Be sure your reply has a Subject: header at the top and a blank line before the message body.
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).