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   - unicore32 and hexagon both have very outdated gcc releases, but the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
  ...

1 files changed, 0 insertions, 162 deletions

diff --git a/arch/tile/include/asm/backtrace.h b/arch/tile/include/asm/backtrace.h
deleted file mode 100644
index bd5399a69edf..000000000000
--- a/arch/tile/include/asm/backtrace.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/*
- * Copyright 2010 Tilera Corporation. All Rights Reserved.
- *
- *   This program is free software; you can redistribute it and/or
- *   modify it under the terms of the GNU General Public License
- *   as published by the Free Software Foundation, version 2.
- *
- *   This program is distributed in the hope that it will be useful, but
- *   WITHOUT ANY WARRANTY; without even the implied warranty of
- *   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
- *   NON INFRINGEMENT.  See the GNU General Public License for
- *   more details.
- */
-
-#ifndef _ASM_TILE_BACKTRACE_H
-#define _ASM_TILE_BACKTRACE_H
-
-#include <linux/types.h>
-
-/* Reads 'size' bytes from 'address' and writes the data to 'result'.
- * Returns true if successful, else false (e.g. memory not readable).
- */
-typedef bool (*BacktraceMemoryReader)(void *result,
-				      unsigned long address,
-				      unsigned int size,
-				      void *extra);
-
-typedef struct {
-	/* Current PC. */
-	unsigned long pc;
-
-	/* Current stack pointer value. */
-	unsigned long sp;
-
-	/* Current frame pointer value (i.e. caller's stack pointer) */
-	unsigned long fp;
-
-	/* Internal use only: caller's PC for first frame. */
-	unsigned long initial_frame_caller_pc;
-
-	/* Internal use only: callback to read memory. */
-	BacktraceMemoryReader read_memory_func;
-
-	/* Internal use only: arbitrary argument to read_memory_func. */
-	void *read_memory_func_extra;
-
-} BacktraceIterator;
-
-
-typedef enum {
-
-	/* We have no idea what the caller's pc is. */
-	PC_LOC_UNKNOWN,
-
-	/* The caller's pc is currently in lr. */
-	PC_LOC_IN_LR,
-
-	/* The caller's pc can be found by dereferencing the caller's sp. */
-	PC_LOC_ON_STACK
-
-} CallerPCLocation;
-
-
-typedef enum {
-
-	/* We have no idea what the caller's sp is. */
-	SP_LOC_UNKNOWN,
-
-	/* The caller's sp is currently in r52. */
-	SP_LOC_IN_R52,
-
-	/* The caller's sp can be found by adding a certain constant
-	 * to the current value of sp.
-	 */
-	SP_LOC_OFFSET
-
-} CallerSPLocation;
-
-
-/* Bit values ORed into CALLER_* values for info ops. */
-enum {
-	/* Setting the low bit on any of these values means the info op
-	 * applies only to one bundle ago.
-	 */
-	ONE_BUNDLE_AGO_FLAG = 1,
-
-	/* Setting this bit on a CALLER_SP_* value means the PC is in LR.
-	 * If not set, PC is on the stack.
-	 */
-	PC_IN_LR_FLAG = 2,
-
-	/* This many of the low bits of a CALLER_SP_* value are for the
-	 * flag bits above.
-	 */
-	NUM_INFO_OP_FLAGS = 2,
-
-	/* We cannot have one in the memory pipe so this is the maximum. */
-	MAX_INFO_OPS_PER_BUNDLE = 2
-};
-
-
-/* Internal constants used to define 'info' operands. */
-enum {
-	/* 0 and 1 are reserved, as are all negative numbers. */
-
-	CALLER_UNKNOWN_BASE = 2,
-
-	CALLER_SP_IN_R52_BASE = 4,
-
-	CALLER_SP_OFFSET_BASE = 8,
-};
-
-
-/* Current backtracer state describing where it thinks the caller is. */
-typedef struct {
-	/*
-	 * Public fields
-	 */
-
-	/* How do we find the caller's PC? */
-	CallerPCLocation pc_location : 8;
-
-	/* How do we find the caller's SP? */
-	CallerSPLocation sp_location : 8;
-
-	/* If sp_location == SP_LOC_OFFSET, then caller_sp == sp +
-	 * loc->sp_offset. Else this field is undefined.
-	 */
-	uint16_t sp_offset;
-
-	/* In the most recently visited bundle a terminating bundle? */
-	bool at_terminating_bundle;
-
-	/*
-	 * Private fields
-	 */
-
-	/* Will the forward scanner see someone clobbering sp
-	 * (i.e. changing it with something other than addi sp, sp, N?)
-	 */
-	bool sp_clobber_follows;
-
-	/* Operand to next "visible" info op (no more than one bundle past
-	 * the next terminating bundle), or -32768 if none.
-	 */
-	int16_t next_info_operand;
-
-	/* Is the info of in next_info_op in the very next bundle? */
-	bool is_next_info_operand_adjacent;
-
-} CallerLocation;
-
-extern void backtrace_init(BacktraceIterator *state,
-                          BacktraceMemoryReader read_memory_func,
-                          void *read_memory_func_extra,
-                          unsigned long pc, unsigned long lr,
-                          unsigned long sp, unsigned long r52);
-
-
-extern bool backtrace_next(BacktraceIterator *state);
-
-#endif /* _ASM_TILE_BACKTRACE_H */