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authorDavid S. Miller <davem@davemloft.net>2019-06-07 21:00:14 +0300
committerDavid S. Miller <davem@davemloft.net>2019-06-07 21:00:14 +0300
commita6cdeeb16bff89c8486324f53577db058cbe81ba (patch)
treede2d38e10f5768bdf1d2902112a4803d0ae767f3 /Documentation
parent96524ea4be04683bb3ad8ebaedcbe3a6e34302de (diff)
parent1e1d926369545ea09c98c6c7f5d109aa4ee0cd0b (diff)
downloadlinux-a6cdeeb16bff89c8486324f53577db058cbe81ba.tar.xz
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
Some ISDN files that got removed in net-next had some changes done in mainline, take the removals. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/cgroup-v2.rst9
-rw-r--r--Documentation/filesystems/overlayfs.txt16
-rw-r--r--Documentation/usb/rio.txt66
-rw-r--r--Documentation/vm/hmm.rst8
4 files changed, 41 insertions, 58 deletions
diff --git a/Documentation/admin-guide/cgroup-v2.rst b/Documentation/admin-guide/cgroup-v2.rst
index 88e746074252..cf88c1f98270 100644
--- a/Documentation/admin-guide/cgroup-v2.rst
+++ b/Documentation/admin-guide/cgroup-v2.rst
@@ -177,6 +177,15 @@ cgroup v2 currently supports the following mount options.
ignored on non-init namespace mounts. Please refer to the
Delegation section for details.
+ memory_localevents
+
+ Only populate memory.events with data for the current cgroup,
+ and not any subtrees. This is legacy behaviour, the default
+ behaviour without this option is to include subtree counts.
+ This option is system wide and can only be set on mount or
+ modified through remount from the init namespace. The mount
+ option is ignored on non-init namespace mounts.
+
Organizing Processes and Threads
--------------------------------
diff --git a/Documentation/filesystems/overlayfs.txt b/Documentation/filesystems/overlayfs.txt
index eef7d9d259e8..1da2f1668f08 100644
--- a/Documentation/filesystems/overlayfs.txt
+++ b/Documentation/filesystems/overlayfs.txt
@@ -336,8 +336,20 @@ the copied layers will fail the verification of the lower root file handle.
Non-standard behavior
---------------------
-Overlayfs can now act as a POSIX compliant filesystem with the following
-features turned on:
+Current version of overlayfs can act as a mostly POSIX compliant
+filesystem.
+
+This is the list of cases that overlayfs doesn't currently handle:
+
+a) POSIX mandates updating st_atime for reads. This is currently not
+done in the case when the file resides on a lower layer.
+
+b) If a file residing on a lower layer is opened for read-only and then
+memory mapped with MAP_SHARED, then subsequent changes to the file are not
+reflected in the memory mapping.
+
+The following options allow overlayfs to act more like a standards
+compliant filesystem:
1) "redirect_dir"
diff --git a/Documentation/usb/rio.txt b/Documentation/usb/rio.txt
index ca9adcf56355..ea73475471db 100644
--- a/Documentation/usb/rio.txt
+++ b/Documentation/usb/rio.txt
@@ -76,70 +76,30 @@ Additional Information and userspace tools
Requirements
============
-A host with a USB port. Ideally, either a UHCI (Intel) or OHCI
-(Compaq and others) hardware port should work.
+A host with a USB port running a Linux kernel with RIO 500 support enabled.
-A Linux development kernel (2.3.x) with USB support enabled or a
-backported version to linux-2.2.x. See http://www.linux-usb.org for
-more information on accomplishing this.
+The driver is a module called rio500, which should be automatically loaded
+as you plug in your device. If that fails you can manually load it with
-A Linux kernel with RIO 500 support enabled.
+ modprobe rio500
-'lspci' which is only needed to determine the type of USB hardware
-available in your machine.
-
-Configuration
-
-Using `lspci -v`, determine the type of USB hardware available.
-
- If you see something like::
-
- USB Controller: ......
- Flags: .....
- I/O ports at ....
-
- Then you have a UHCI based controller.
-
- If you see something like::
-
- USB Controller: .....
- Flags: ....
- Memory at .....
-
- Then you have a OHCI based controller.
-
-Using `make menuconfig` or your preferred method for configuring the
-kernel, select 'Support for USB', 'OHCI/UHCI' depending on your
-hardware (determined from the steps above), 'USB Diamond Rio500 support', and
-'Preliminary USB device filesystem'. Compile and install the modules
-(you may need to execute `depmod -a` to update the module
-dependencies).
-
-Add a device for the USB rio500::
+Udev should automatically create a device node as soon as plug in your device.
+If that fails, you can manually add a device for the USB rio500::
mknod /dev/usb/rio500 c 180 64
-Set appropriate permissions for /dev/usb/rio500 (don't forget about
-group and world permissions). Both read and write permissions are
+In that case, set appropriate permissions for /dev/usb/rio500 (don't forget
+about group and world permissions). Both read and write permissions are
required for proper operation.
-Load the appropriate modules (if compiled as modules):
-
- OHCI::
-
- modprobe usbcore
- modprobe usb-ohci
- modprobe rio500
-
- UHCI::
-
- modprobe usbcore
- modprobe usb-uhci (or uhci)
- modprobe rio500
-
That's it. The Rio500 Utils at: http://rio500.sourceforge.net should
be able to access the rio500.
+Limits
+======
+
+You can use only a single rio500 device at a time with your computer.
+
Bugs
====
diff --git a/Documentation/vm/hmm.rst b/Documentation/vm/hmm.rst
index ec1efa32af3c..7cdf7282e022 100644
--- a/Documentation/vm/hmm.rst
+++ b/Documentation/vm/hmm.rst
@@ -288,15 +288,17 @@ For instance if the device flags for device entries are:
WRITE (1 << 62)
Now let say that device driver wants to fault with at least read a range then
-it does set:
- range->default_flags = (1 << 63)
+it does set::
+
+ range->default_flags = (1 << 63);
range->pfn_flags_mask = 0;
and calls hmm_range_fault() as described above. This will fill fault all page
in the range with at least read permission.
Now let say driver wants to do the same except for one page in the range for
-which its want to have write. Now driver set:
+which its want to have write. Now driver set::
+
range->default_flags = (1 << 63);
range->pfn_flags_mask = (1 << 62);
range->pfns[index_of_write] = (1 << 62);