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Message-ID: <20240703231343.GA408-beaub@linux.microsoft.com>
Date: Wed, 3 Jul 2024 16:13:43 -0700
From: Beau Belgrave <beaub@...ux.microsoft.com>
To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Cc: rostedt@...dmis.org, mhiramat@...nel.org, corbet@....net,
linux-trace-kernel@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-doc@...r.kernel.org
Subject: Re: [PATCH] Documentation: Document user_events ioctl code
On Wed, Jul 03, 2024 at 06:58:03PM -0400, Mathieu Desnoyers wrote:
> On 03-Jul-2024 10:25:01 PM, Beau Belgrave wrote:
> > The user events trace subsystem uses the 0x2A/'*' code for ioctls. These
> > are published via the uapi/linux/user_events.h header file.
> >
> > Add a line indicating user events as the owner of the 0x2A/'*' code and the
> > current sequence numbers that are in use (00-02).
> >
> > Signed-off-by: Beau Belgrave <beaub@...ux.microsoft.com>
> > ---
> > Documentation/userspace-api/ioctl/ioctl-number.rst | 2 ++
> > 1 file changed, 2 insertions(+)
> >
> > diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
> > index a141e8e65c5d..191609fe4593 100644
> > --- a/Documentation/userspace-api/ioctl/ioctl-number.rst
> > +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
> > @@ -97,6 +97,8 @@ Code Seq# Include File Comments
> > '%' 00-0F include/uapi/linux/stm.h System Trace Module subsystem
> > <mailto:alexander.shishkin@...ux.intel.com>
> > '&' 00-07 drivers/firewire/nosy-user.h
> > +'*' 00-02 uapi/linux/user_events.h User Events Subsystem
>
> You may want to consider reserving a wider sequence number range to plan
> ahead for future extensions to user events. This way you won't end up
> having to jump over sequence numbers eventually reserved by others
> within the '*' code.
>
> Thanks,
>
> Mathieu
Yeah, I thought about that, but really didn't know how greedy we could
be. At first I had all, but then thought we would never use all of that
sequence. We'll likely want a few more for libside integration.
Maybe I'll grab the first 16, that should leave a lot for others and
give us quite bit of growing room.
How many do you think we'll need for libside? I think we'd only need 2-3
personally.
Thanks,
-Beau
>
>
> > + <mailto:linux-trace-kernel@...r.kernel.org>
> > '1' 00-1F linux/timepps.h PPS kit from Ulrich Windl
> > <ftp://ftp.de.kernel.org/pub/linux/daemons/ntp/PPS/>
> > '2' 01-04 linux/i2o.h
> > --
> > 2.34.1
> >
>
> --
> Mathieu Desnoyers
> EfficiOS Inc.
> http://www.efficios.com
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