linux-kernel - [PATCH V2] UIO: make maximum memory and port regions configurable

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Message-ID: <20200307081008.26848-1-suqiang4@huawei.com>
Date:   Sat, 7 Mar 2020 16:10:08 +0800
From:   Qiang Su <suqiang4@...wei.com>
To:     <gregkh@...uxfoundation.org>, <suqiang4@...wei.com>
CC:     <linux-kernel@...r.kernel.org>
Subject: [PATCH V2] UIO: make maximum memory and port regions configurable

Now each uio device can only support 5 memory regions and
5 port regions. It is far from enough for some big system.
On the other hand, the hard-coded style is not flexible.

Consider the marco is used as array index, so a range for
the config is set in menuconfig. The range is set as 1 to 512.
The default value is still set as 5 to keep consistent with
current code.

Signed-off-by: Qiang Su <suqiang4@...wei.com>
Reported-by: kbuild test robot <lkp@...el.com>
---
Changes since v1:
- also make port regions configurable in menuconfig.
- fix kbuild errors.
---
 drivers/uio/Kconfig        | 18 ++++++++++++++++++
 include/linux/uio_driver.h |  4 ++--
 2 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
index 202ee81cfc2b..cee7d93cfea2 100644
--- a/drivers/uio/Kconfig
+++ b/drivers/uio/Kconfig
@@ -165,4 +165,22 @@ config UIO_HV_GENERIC
 	  to network and storage devices from userspace.
 
 	  If you compile this as a module, it will be called uio_hv_generic.
+
+config MAX_UIO_MAPS
+	depends on UIO
+	int "Maximum of memory nodes each uio device support(1-512)"
+	range 1 512
+	default 5
+	help
+	  make the max number of memory regions in uio device configurable.
+
+config MAX_UIO_PORT_REGIONS
+	depends on UIO
+	int "Maximum of port regions each uio device support(1-512)"
+	range 1 512
+	default 5
+	help
+	  make the max number of port regions in uio device configurable.
+
+
 endif
diff --git a/include/linux/uio_driver.h b/include/linux/uio_driver.h
index 01081c4726c0..5dc60088834c 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_MAX_UIO_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_MAX_UIO_PORT_REGIONS
 
 struct uio_device {
         struct module           *owner;
-- 
2.12.3