Merge tag 'docs/v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media

Pull rst conversion of docs from Mauro Carvalho Chehab:
 "As agreed with Jon, I'm sending this big series directly to you, c/c
  him, as this series required a special care, in order to avoid
  conflicts with other trees"

* tag 'docs/v5.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (77 commits)
  docs: kbuild: fix build with pdf and fix some minor issues
  docs: block: fix pdf output
  docs: arm: fix a breakage with pdf output
  docs: don't use nested tables
  docs: gpio: add sysfs interface to the admin-guide
  docs: locking: add it to the main index
  docs: add some directories to the main documentation index
  docs: add SPDX tags to new index files
  docs: add a memory-devices subdir to driver-api
  docs: phy: place documentation under driver-api
  docs: serial: move it to the driver-api
  docs: driver-api: add remaining converted dirs to it
  docs: driver-api: add xilinx driver API documentation
  docs: driver-api: add a series of orphaned documents
  docs: admin-guide: add a series of orphaned documents
  docs: cgroup-v1: add it to the admin-guide book
  docs: aoe: add it to the driver-api book
  docs: add some documentation dirs to the driver-api book
  docs: driver-model: move it to the driver-api book
  docs: lp855x-driver.rst: add it to the driver-api book
  ...

1 files changed, 80 insertions, 0 deletions

diff --git a/Documentation/admin-guide/highuid.rst b/Documentation/admin-guide/highuid.rst
new file mode 100644
index 000000000000..6ee70465c0ea
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+===================================================
+Notes on the change from 16-bit UIDs to 32-bit UIDs
+===================================================
+
+:Author: Chris Wing <wingc@umich.edu>
+:Last updated: January 11, 2000
+
+- kernel code MUST take into account __kernel_uid_t and __kernel_uid32_t
+  when communicating between user and kernel space in an ioctl or data
+  structure.
+
+- kernel code should use uid_t and gid_t in kernel-private structures and
+  code.
+
+What's left to be done for 32-bit UIDs on all Linux architectures:
+
+- Disk quotas have an interesting limitation that is not related to the
+  maximum UID/GID. They are limited by the maximum file size on the
+  underlying filesystem, because quota records are written at offsets
+  corresponding to the UID in question.
+  Further investigation is needed to see if the quota system can cope
+  properly with huge UIDs. If it can deal with 64-bit file offsets on all 
+  architectures, this should not be a problem.
+
+- Decide whether or not to keep backwards compatibility with the system
+  accounting file, or if we should break it as the comments suggest
+  (currently, the old 16-bit UID and GID are still written to disk, and
+  part of the former pad space is used to store separate 32-bit UID and
+  GID)
+
+- Need to validate that OS emulation calls the 16-bit UID
+  compatibility syscalls, if the OS being emulated used 16-bit UIDs, or
+  uses the 32-bit UID system calls properly otherwise.
+
+  This affects at least:
+
+	- iBCS on Intel
+
+	- sparc32 emulation on sparc64
+	  (need to support whatever new 32-bit UID system calls are added to
+	  sparc32)
+
+- Validate that all filesystems behave properly.
+
+  At present, 32-bit UIDs _should_ work for:
+
+	- ext2
+	- ufs
+	- isofs
+	- nfs
+	- coda
+	- udf
+
+  Ioctl() fixups have been made for:
+
+	- ncpfs
+	- smbfs
+
+  Filesystems with simple fixups to prevent 16-bit UID wraparound:
+
+	- minix
+	- sysv
+	- qnx4
+
+  Other filesystems have not been checked yet.
+
+- The ncpfs and smpfs filesystems cannot presently use 32-bit UIDs in
+  all ioctl()s. Some new ioctl()s have been added with 32-bit UIDs, but
+  more are needed. (as well as new user<->kernel data structures)
+
+- The ELF core dump format only supports 16-bit UIDs on arm, i386, m68k,
+  sh, and sparc32. Fixing this is probably not that important, but would
+  require adding a new ELF section.
+
+- The ioctl()s used to control the in-kernel NFS server only support
+  16-bit UIDs on arm, i386, m68k, sh, and sparc32.
+
+- make sure that the UID mapping feature of AX25 networking works properly
+  (it should be safe because it's always used a 32-bit integer to
+  communicate between user and kernel)