linux-stable.git/drivers/tty/Kconfig, branch linux-5.4.y

docs: serial: move it to the driver-api

2019-07-15T14:03:03+00:00

The contents of this directory is mostly driver-api stuff.

Signed-off-by: Mauro Carvalho Chehab

docs: driver-api: add a series of orphaned documents

2019-07-15T14:03:02+00:00

There are lots of documents under Documentation/*.txt and a few other
orphan documents elsehwere that belong to the driver-API book.

Move them to their right place.

Reviewed-by: Cornelia Huck  # vfio-related parts
Acked-by: Logan Gunthorpe  # switchtec
Signed-off-by: Mauro Carvalho Chehab

docs: console.txt: convert docs to ReST and rename to *.rst

2019-07-15T12:20:23+00:00

Convert this small file to ReST in preparation for adding it to
the driver-api book.

While this is not part of the driver-api book, mark it as
:orphan:, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab 
Acked-by: Greg Kroah-Hartman 
Acked-by: Bartlomiej Zolnierkiewicz

docs: fb: convert docs to ReST and rename to *.rst

2019-06-14T20:21:11+00:00

The conversion is actually:
  - add blank lines and identation in order to identify paragraphs;
  - fix tables markups;
  - add some lists markups;
  - mark literal blocks;
  - adjust title markups.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Also, removed the Maintained by, as requested by Geert.

Signed-off-by: Mauro Carvalho Chehab 
Signed-off-by: Jonathan Corbet

docs: serial: convert docs to ReST and rename to *.rst

2019-04-25T09:37:42+00:00

The converted files are focused at the Kernel internal API,
so, this is a good candidate for the kernel API set of books.

The conversion is actually:
  - add blank lines and identation in order to identify paragraphs;
  - fix tables markups;
  - add some lists markups;
  - mark literal blocks;
  - adjust title markups.

At its new index.rst, let's add a :orphan: while this is not linked to
the main index.rst file, in order to avoid build warnings.

Signed-off-by: Mauro Carvalho Chehab 
Signed-off-by: Greg Kroah-Hartman

tty: Add NULL TTY driver

2019-04-16T13:21:34+00:00

If no console driver is enabled (or if a non-present driver is selected
with something like console=null in an attempt to disable the console),
opening /dev/console errors out, and init scripts and other userspace
code that relies on the existence of a console will fail.  Symlinking
/dev/null to /dev/console does not solve the problem since /dev/null
does not behave like a real TTY.

To just provide a dummy console to userspace when no console driver is
available or desired, add a ttynull driver which simply discards all
writes.  It can be chosen on the command line in the standard way, i.e.
with console=ttynull.

Signed-off-by: Vincent Whitchurch 
Signed-off-by: Greg Kroah-Hartman

tty: remove redundant 'default n' from Kconfig-s

2019-04-16T13:21:33+00:00

'default n' is the default value for any bool or tristate Kconfig
setting so there is no need to write it explicitly.

Also since commit f467c5640c29 ("kconfig: only write '# CONFIG_FOO
is not set' for visible symbols") the Kconfig behavior is the same
regardless of 'default n' being present or not:

    ...
    One side effect of (and the main motivation for) this change is making
    the following two definitions behave exactly the same:

        config FOO
                bool

        config FOO
                bool
                default n

    With this change, neither of these will generate a
    '# CONFIG_FOO is not set' line (assuming FOO isn't selected/implied).
    That might make it clearer to people that a bare 'default n' is
    redundant.
    ...

Signed-off-by: Bartlomiej Zolnierkiewicz 
Signed-off-by: Greg Kroah-Hartman

tty: add SPDX identifiers to Kconfig and Makefiles

2019-04-04T16:48:43+00:00

There were a few Kconfig and Makefiles under drivers/tty/ that were
missing a SPDX identifier.  Fix that up so that automated tools can
properly classify all kernel source files.

Cc: Jiri Slaby 
Cc: Jiri Kosina 
Cc: Rob Herring 
Acked-by: David Sterba 
Reviewed-by: Mukesh Ojha 
Signed-off-by: Greg Kroah-Hartman

tty: ldisc: add sysctl to prevent autoloading of ldiscs

2019-01-30T08:31:30+00:00

By default, the kernel will automatically load the module of any line
dicipline that is asked for.  As this sometimes isn't the safest thing
to do, provide a sysctl to disable this feature.

By default, we set this to 'y' as that is the historical way that Linux
has worked, and we do not want to break working systems.  But in the
future, perhaps this can default to 'n' to prevent this functionality.

Signed-off-by: Greg Kroah-Hartman 
Reviewed-by: Theodore Ts'o 
Signed-off-by: Greg Kroah-Hartman

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux

2018-04-09T16:04:10+00:00

Pull s390 updates from Martin Schwidefsky:

 - Improvements for the spectre defense:
    * The spectre related code is consolidated to a single file
      nospec-branch.c
    * Automatic enable/disable for the spectre v2 defenses (expoline vs.
      nobp)
    * Syslog messages for specve v2 are added
    * Enable CONFIG_GENERIC_CPU_VULNERABILITIES and define the attribute
      functions for spectre v1 and v2

 - Add helper macros for assembler alternatives and use them to shorten
   the code in entry.S.

 - Add support for persistent configuration data via the SCLP Store Data
   interface. The H/W interface requires a page table that uses 4K pages
   only, the code to setup such an address space is added as well.

 - Enable virtio GPU emulation in QEMU. To do this the depends
   statements for a few common Kconfig options are modified.

 - Add support for format-3 channel path descriptors and add a binary
   sysfs interface to export the associated utility strings.

 - Add a sysfs attribute to control the IFCC handling in case of
   constant channel errors.

 - The vfio-ccw changes from Cornelia.

 - Bug fixes and cleanups.

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux: (40 commits)
  s390/kvm: improve stack frame constants in entry.S
  s390/lpp: use assembler alternatives for the LPP instruction
  s390/entry.S: use assembler alternatives
  s390: add assembler macros for CPU alternatives
  s390: add sysfs attributes for spectre
  s390: report spectre mitigation via syslog
  s390: add automatic detection of the spectre defense
  s390: move nobp parameter functions to nospec-branch.c
  s390/cio: add util_string sysfs attribute
  s390/chsc: query utility strings via fmt3 channel path descriptor
  s390/cio: rename struct channel_path_desc
  s390/cio: fix unbind of io_subchannel_driver
  s390/qdio: split up CCQ handling for EQBS / SQBS
  s390/qdio: don't retry EQBS after CCQ 96
  s390/qdio: restrict buffer merging to eligible devices
  s390/qdio: don't merge ERROR output buffers
  s390/qdio: simplify math in get_*_buffer_frontier()
  s390/decompressor: trim uncompressed image head during the build
  s390/crypto: Fix kernel crash on aes_s390 module remove.
  s390/defkeymap: fix global init to zero
  ...