From: Qiang Su <suqiang4@huawei.com>
To: <gregkh@linuxfoundation.org>, <suqiang4@huawei.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: [PATCH V2] UIO: make maximum memory and port regions configurable
Date: Sat, 7 Mar 2020 16:10:08 +0800 [thread overview]
Message-ID: <20200307081008.26848-1-suqiang4@huawei.com> (raw)
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@huawei.com>
Reported-by: kbuild test robot <lkp@intel.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
next reply other threads:[~2020-03-07 8:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-07 8:10 Qiang Su [this message]
2020-03-18 11:33 ` [PATCH V2] UIO: make maximum memory and port regions configurable Greg KH
2020-03-19 3:11 ` suqiang (C)
2020-03-19 7:18 ` Greg KH
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