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authorRosen Penev <rosenp@gmail.com>2026-09-27 13:35:01 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2026-10-01 11:04:53 +0200
commit8167c1f071426706c233e93ecfd13aba7d5c06c8 (patch)
tree2c0cd5f5e1cc35eadee98d49fe034f96a88856ce /Documentation/admin-guide/sysctl/user.rst
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tty: serial: mpc52xx_uart: move static declarations up.grafted
Avoid a compilation error so that they're not used before being declared. Fixes: 4d105880666a ("tty: serial: mpc52xx_uart: add bounds check for psc_num array index") Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/oe-kbuild-all/202609260356.tJWbd1WU-lkp@intel.com/ Signed-off-by: Rosen Penev <rosenp@gmail.com> Link: https://patch.msgid.link/20260927203501.14105-1-rosenp@gmail.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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+=================================
+Documentation for /proc/sys/user/
+=================================
+
+kernel version 4.9.0
+
+Copyright (c) 2016 Eric Biederman <ebiederm@xmission.com>
+
+------------------------------------------------------------------------------
+
+This file contains the documentation for the sysctl files in
+/proc/sys/user.
+
+The files in this directory can be used to override the default
+limits on the number of namespaces and other objects that have
+per user per user namespace limits.
+
+The primary purpose of these limits is to stop programs that
+malfunction and attempt to create a ridiculous number of objects,
+before the malfunction becomes a system wide problem. It is the
+intention that the defaults of these limits are set high enough that
+no program in normal operation should run into these limits.
+
+The creation of per user per user namespace objects are charged to
+the user in the user namespace who created the object and
+verified to be below the per user limit in that user namespace.
+
+The creation of objects is also charged to all of the users
+who created user namespaces the creation of the object happens
+in (user namespaces can be nested) and verified to be below the per user
+limits in the user namespaces of those users.
+
+This recursive counting of created objects ensures that creating a
+user namespace does not allow a user to escape their current limits.
+
+Currently, these files are in /proc/sys/user:
+
+max_cgroup_namespaces
+=====================
+
+ The maximum number of cgroup namespaces that any user in the current
+ user namespace may create.
+
+max_ipc_namespaces
+==================
+
+ The maximum number of ipc namespaces that any user in the current
+ user namespace may create.
+
+max_mnt_namespaces
+==================
+
+ The maximum number of mount namespaces that any user in the current
+ user namespace may create.
+
+max_net_namespaces
+==================
+
+ The maximum number of network namespaces that any user in the
+ current user namespace may create.
+
+max_pid_namespaces
+==================
+
+ The maximum number of pid namespaces that any user in the current
+ user namespace may create.
+
+max_time_namespaces
+===================
+
+ The maximum number of time namespaces that any user in the current
+ user namespace may create.
+
+max_user_namespaces
+===================
+
+ The maximum number of user namespaces that any user in the current
+ user namespace may create.
+
+max_uts_namespaces
+==================
+
+ The maximum number of user namespaces that any user in the current
+ user namespace may create.