Merge tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic

Pul removal of obsolete architecture ports from Arnd Bergmann:
 "This removes the entire architecture code for blackfin, cris, frv,
  m32r, metag, mn10300, score, and tile, including the associated device
  drivers.

  I have been working with the (former) maintainers for each one to
  ensure that my interpretation was right and the code is definitely
  unused in mainline kernels. Many had fond memories of working on the
  respective ports to start with and getting them included in upstream,
  but also saw no point in keeping the port alive without any users.

  In the end, it seems that while the eight architectures are extremely
  different, they all suffered the same fate: There was one company in
  charge of an SoC line, a CPU microarchitecture and a software
  ecosystem, which was more costly than licensing newer off-the-shelf
  CPU cores from a third party (typically ARM, MIPS, or RISC-V). It
  seems that all the SoC product lines are still around, but have not
  used the custom CPU architectures for several years at this point. In
  contrast, CPU instruction sets that remain popular and have actively
  maintained kernel ports tend to all be used across multiple licensees.

  [ See the new nds32 port merged in the previous commit for the next
    generation of "one company in charge of an SoC line, a CPU
    microarchitecture and a software ecosystem"   - Linus ]

  The removal came out of a discussion that is now documented at
  https://lwn.net/Articles/748074/. Unlike the original plans, I'm not
  marking any ports as deprecated but remove them all at once after I
  made sure that they are all unused. Some architectures (notably tile,
  mn10300, and blackfin) are still being shipped in products with old
  kernels, but those products will never be updated to newer kernel
  releases.

  After this series, we still have a few architectures without mainline
  gcc support:

   - unicore32 and hexagon both have very outdated gcc releases, but the
     maintainers promised to work on providing something newer. At least
     in case of hexagon, this will only be llvm, not gcc.

   - openrisc, risc-v and nds32 are still in the process of finishing
     their support or getting it added to mainline gcc in the first
     place. They all have patched gcc-7.3 ports that work to some
     degree, but complete upstream support won't happen before gcc-8.1.
     Csky posted their first kernel patch set last week, their situation
     will be similar

  [ Palmer Dabbelt points out that RISC-V support is in mainline gcc
    since gcc-7, although gcc-7.3.0 is the recommended minimum  - Linus ]"

This really says it all:

 2498 files changed, 95 insertions(+), 467668 deletions(-)

* tag 'arch-removal' of git://git.kernel.org/pub/scm/linux/kernel/git/arnd/asm-generic: (74 commits)
  MAINTAINERS: UNICORE32: Change email account
  staging: iio: remove iio-trig-bfin-timer driver
  tty: hvc: remove tile driver
  tty: remove bfin_jtag_comm and hvc_bfin_jtag drivers
  serial: remove tile uart driver
  serial: remove m32r_sio driver
  serial: remove blackfin drivers
  serial: remove cris/etrax uart drivers
  usb: Remove Blackfin references in USB support
  usb: isp1362: remove blackfin arch glue
  usb: musb: remove blackfin port
  usb: host: remove tilegx platform glue
  pwm: remove pwm-bfin driver
  i2c: remove bfin-twi driver
  spi: remove blackfin related host drivers
  watchdog: remove bfin_wdt driver
  can: remove bfin_can driver
  mmc: remove bfin_sdh driver
  input: misc: remove blackfin rotary driver
  input: keyboard: remove bf54x driver
  ...

6 files changed, 5 insertions, 7 deletions

diff --git a/include/asm-generic/atomic.h b/include/asm-generic/atomic.h
index 3f38eb03649c9..abe6dd9ca2a86 100644
--- a/include/asm-generic/atomic.h
+++ b/include/asm-generic/atomic.h
@@ -2,8 +2,6 @@
  * Generic C implementation of atomic counter operations. Usable on
  * UP systems only. Do not include in machine independent code.
  *
- * Originally implemented for MN10300.
- *
  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
  *
diff --git a/include/asm-generic/barrier.h b/include/asm-generic/barrier.h
index fe297b599b0a1..29458bbb2fa04 100644
--- a/include/asm-generic/barrier.h
+++ b/include/asm-generic/barrier.h
@@ -1,5 +1,5 @@
 /*
- * Generic barrier definitions, originally based on MN10300 definitions.
+ * Generic barrier definitions.
  *
  * It should be possible to use these on really simple architectures,
  * but it serves more as a starting point for new ports.
diff --git a/include/asm-generic/exec.h b/include/asm-generic/exec.h
index 567766b0074ae..32c0a216f576c 100644
--- a/include/asm-generic/exec.h
+++ b/include/asm-generic/exec.h
@@ -1,4 +1,4 @@
-/* Generic process execution definitions, based on MN10300 definitions.
+/* Generic process execution definitions.
  *
  * It should be possible to use these on really simple architectures,
  * but it serves more as a starting point for new ports.
diff --git a/include/asm-generic/io.h b/include/asm-generic/io.h
index 7c6a39e647491..8de9cc2512863 100644
--- a/include/asm-generic/io.h
+++ b/include/asm-generic/io.h
@@ -1,4 +1,4 @@
-/* Generic I/O port emulation, based on MN10300 code
+/* Generic I/O port emulation.
  *
  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
diff --git a/include/asm-generic/pci_iomap.h b/include/asm-generic/pci_iomap.h
index 854f96ad5ccba..d4f16dcc2ed79 100644
--- a/include/asm-generic/pci_iomap.h
+++ b/include/asm-generic/pci_iomap.h
@@ -1,5 +1,5 @@
 /* SPDX-License-Identifier: GPL-2.0+ */
-/* Generic I/O port emulation, based on MN10300 code
+/* Generic I/O port emulation.
  *
  * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
  * Written by David Howells (dhowells@redhat.com)
diff --git a/include/asm-generic/switch_to.h b/include/asm-generic/switch_to.h
index 052c4ac04fd54..986acc9d34bbd 100644
--- a/include/asm-generic/switch_to.h
+++ b/include/asm-generic/switch_to.h
@@ -1,4 +1,4 @@
-/* Generic task switch macro wrapper, based on MN10300 definitions.
+/* Generic task switch macro wrapper.
  *
  * It should be possible to use these on really simple architectures,
  * but it serves more as a starting point for new ports.