linux-kernel - [PATCH v2 1/3] Documentation: Bump media IOCTL reserved numbers

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Message-Id: <20250527055648.503884-2-sakari.ailus@linux.intel.com>
Date: Tue, 27 May 2025 08:56:46 +0300
From: Sakari Ailus <sakari.ailus@...ux.intel.com>
To: linux-doc@...r.kernel.org
Cc: Jonathan Corbet <corbet@....net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Madhavan Srinivasan <maddy@...ux.ibm.com>,
	Haren Myneni <haren@...ux.ibm.com>,
	Bagas Sanjaya <bagasdotme@...il.com>,
	Andrew Donnellan <ajd@...ux.ibm.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Akshay Gupta <akshay.gupta@....com>,
	linux-kernel@...r.kernel.org,
	linux-media@...r.kernel.org,
	hans@...erkuil.nl,
	laurent.pinchart@...asonboard.com,
	Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
	Lee Jones <lee@...nel.org>
Subject: [PATCH v2 1/3] Documentation: Bump media IOCTL reserved numbers

The Media Controller uses IOCTL type '|' with numbers up to 0x81 while
numbers from 0x80 onwards are allocated for samples, creating a conflict
between allocations for MC and samples. Given that nothing appears to be
using numbers between 0x80 and 0x8f for other purposes than MC, even in
the samples allocation (checked with $ git grep "#define.*_IO.*'|'"), just
reassign the numbers up to 0x8f to linux/media.h and bump the samples
allocation by 0x10.

Signed-off-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>
---
 Documentation/userspace-api/ioctl/ioctl-number.rst | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index bc91756bde73..6b3be3fb0b15 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -312,8 +312,8 @@ Code  Seq#    Include File                                           Comments
 'z'   40-7F                                                          CAN bus card conflict!
                                                                      <mailto:oe@...t.de>
 'z'   10-4F  drivers/s390/crypto/zcrypt_api.h                        conflict!
-'|'   00-7F  linux/media.h
-'|'   80-9F  samples/                                                Any sample and example drivers
+'|'   00-8F  linux/media.h
+'|'   90-AF  samples/                                                Any sample and example drivers
 0x80  00-1F  linux/fb.h
 0x81  00-1F  linux/vduse.h
 0x89  00-06  arch/x86/include/asm/sockios.h
-- 
2.39.5