linux-kernel - [RFC PATCH 2/9] ntsync: Reserve a minor device number and ioctl range.

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Message-ID: <20240124004028.16826-3-zfigura@codeweavers.com>
Date: Tue, 23 Jan 2024 18:40:21 -0600
From: Elizabeth Figura <zfigura@...eweavers.com>
To: Arnd Bergmann <arnd@...db.de>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	linux-kernel@...r.kernel.org,
	linux-api@...r.kernel.org
Cc: wine-devel@...ehq.org,
	André Almeida <andrealmeid@...lia.com>,
	Wolfram Sang <wsa@...nel.org>,
	Arkadiusz Hiler <ahiler@...eweavers.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Elizabeth Figura <zfigura@...eweavers.com>
Subject: [RFC PATCH 2/9] ntsync: Reserve a minor device number and ioctl range.

Signed-off-by: Elizabeth Figura <zfigura@...eweavers.com>
---
 Documentation/admin-guide/devices.txt              | 3 ++-
 Documentation/userspace-api/ioctl/ioctl-number.rst | 2 ++
 drivers/misc/ntsync.c                              | 3 ++-
 include/linux/miscdevice.h                         | 1 +
 4 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/Documentation/admin-guide/devices.txt b/Documentation/admin-guide/devices.txt
index 94c98be1329a..041404397ee5 100644
--- a/Documentation/admin-guide/devices.txt
+++ b/Documentation/admin-guide/devices.txt
@@ -376,8 +376,9 @@
 		240 = /dev/userio	Serio driver testing device
 		241 = /dev/vhost-vsock	Host kernel driver for virtio vsock
 		242 = /dev/rfkill	Turning off radio transmissions (rfkill)
+		243 = /dev/ntsync	NT synchronization primitive device
 
-		243-254			Reserved for local use
+		244-254			Reserved for local use
 		255			Reserved for MISC_DYNAMIC_MINOR
 
   11 char	Raw keyboard device	(Linux/SPARC only)
diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documentation/userspace-api/ioctl/ioctl-number.rst
index 457e16f06e04..a1326a5bc2e0 100644
--- a/Documentation/userspace-api/ioctl/ioctl-number.rst
+++ b/Documentation/userspace-api/ioctl/ioctl-number.rst
@@ -378,6 +378,8 @@ Code  Seq#    Include File                                           Comments
                                                                      <mailto:thomas@...ischhofer.net>
 0xF6  all                                                            LTTng Linux Trace Toolkit Next Generation
                                                                      <mailto:mathieu.desnoyers@...icios.com>
+0xF7  00-1F  uapi/linux/ntsync.h                                     NT synchronization primitives
+                                                                     <mailto:wine-devel@...ehq.org>
 0xF8  all    arch/x86/include/uapi/asm/amd_hsmp.h                    AMD HSMP EPYC system management interface driver
                                                                      <mailto:nchatrad@....com>
 0xFD  all    linux/dm-ioctl.h
diff --git a/drivers/misc/ntsync.c b/drivers/misc/ntsync.c
index 9424c6210e51..84b498e2b2d5 100644
--- a/drivers/misc/ntsync.c
+++ b/drivers/misc/ntsync.c
@@ -40,7 +40,7 @@ static const struct file_operations ntsync_fops = {
 };
 
 static struct miscdevice ntsync_misc = {
-	.minor		= MISC_DYNAMIC_MINOR,
+	.minor		= NTSYNC_MINOR,
 	.name		= NTSYNC_NAME,
 	.fops		= &ntsync_fops,
 };
@@ -51,3 +51,4 @@ MODULE_AUTHOR("Elizabeth Figura");
 MODULE_DESCRIPTION("Kernel driver for NT synchronization primitives");
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("devname:" NTSYNC_NAME);
+MODULE_ALIAS_MISCDEV(NTSYNC_MINOR);
diff --git a/include/linux/miscdevice.h b/include/linux/miscdevice.h
index c0fea6ca5076..fe5d9366fdf7 100644
--- a/include/linux/miscdevice.h
+++ b/include/linux/miscdevice.h
@@ -71,6 +71,7 @@
 #define USERIO_MINOR		240
 #define VHOST_VSOCK_MINOR	241
 #define RFKILL_MINOR		242
+#define NTSYNC_MINOR		243
 #define MISC_DYNAMIC_MINOR	255
 
 struct device;
-- 
2.43.0