linux-kernel - [PATCH] uio: make MAX_UIO_MAPS & MAX_UIO_PORT

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Date:   Wed, 13 Apr 2022 10:11:37 +0300
From:   Ramon Fried <rfried.dev@...il.com>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Cc:     Ramon Fried <rfried.dev@...il.com>
Subject: [PATCH] uio: make MAX_UIO_MAPS & MAX_UIO_PORT_REGIONS configurable

MAX_UIO_MAPS and MAX_UIO_PORT_REGIONS are hard-coded to 5.
This is not always sufficiant for some drivers.
Make the MAX_UIO_MAPS and MAX_UIO_PORT_REGIONS configurable by
providing Kconfig int option with the defaut value of 5.

Signed-off-by: Ramon Fried <rfried.dev@...il.com>
---
 drivers/uio/Kconfig        | 14 ++++++++++++++
 include/linux/uio_driver.h |  4 ++--
 2 files changed, 16 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index 2e16c5338e5b..bc1fe83cec13 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -13,6 +13,20 @@ menuconfig UIO
 
 if UIO
 
+config UIO_MAX_MAPS
+	int "Maximum of memory nodes each uio device support(1-128)"
+	range 1 128
+	default 5
+	help
+	  Maximum memory mapping each uio device can support.
+
+config UIO_MAX_PORT_REGIONS
+	int "Maximum of port regions each uio device support(1-128)"
+	range 1 128
+	default 5
+	help
+	  Maximum port regions each uio device can support.
+
 config UIO_CIF
 	tristate "generic Hilscher CIF Card driver"
 	depends on PCI
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index 47c5962b876b..f7dc47347c71 100644
--- a/include/linux/uio_driver.h
+++ b/include/linux/uio_driver.h
@@ -44,7 +44,7 @@ struct uio_mem {
 	struct uio_map		*map;
 };
 
-#define MAX_UIO_MAPS	5
+#define MAX_UIO_MAPS	CONFIG_UIO_MAX_MAPS
 
 struct uio_portio;
 
@@ -64,7 +64,7 @@ struct uio_port {
 	struct uio_portio	*portio;
 };
 
-#define MAX_UIO_PORT_REGIONS	5
+#define MAX_UIO_PORT_REGIONS	CONFIG_UIO_MAX_PORT_REGIONS
 
 struct uio_device {
 	struct module           *owner;
-- 
2.30.2