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   - unicore32 and hexagon both have very outdated gcc releases, but the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, 239 deletions

diff --git a/arch/tile/kernel/ftrace.c b/arch/tile/kernel/ftrace.c
deleted file mode 100644
index b827a418b155..000000000000
--- a/arch/tile/kernel/ftrace.c
+++ /dev/null
@@ -1,239 +0,0 @@
-/*
- * Copyright 2012 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.
- *
- * TILE-Gx specific ftrace support
- */
-
-#include <linux/ftrace.h>
-#include <linux/uaccess.h>
-
-#include <asm/cacheflush.h>
-#include <asm/ftrace.h>
-#include <asm/sections.h>
-#include <asm/insn.h>
-
-#include <arch/opcode.h>
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-
-static int machine_stopped __read_mostly;
-
-int ftrace_arch_code_modify_prepare(void)
-{
-	machine_stopped = 1;
-	return 0;
-}
-
-int ftrace_arch_code_modify_post_process(void)
-{
-	flush_icache_range(0, CHIP_L1I_CACHE_SIZE());
-	machine_stopped = 0;
-	return 0;
-}
-
-/*
- * Put { move r10, lr; jal ftrace_caller } in a bundle, this lets dynamic
- * tracer just add one cycle overhead to every kernel function when disabled.
- */
-static unsigned long ftrace_gen_branch(unsigned long pc, unsigned long addr,
-				       bool link)
-{
-	tilegx_bundle_bits opcode_x0, opcode_x1;
-	long pcrel_by_instr = (addr - pc) >> TILEGX_LOG2_BUNDLE_SIZE_IN_BYTES;
-
-	if (link) {
-		/* opcode: jal addr */
-		opcode_x1 =
-			create_Opcode_X1(JUMP_OPCODE_X1) |
-			create_JumpOpcodeExtension_X1(JAL_JUMP_OPCODE_X1) |
-			create_JumpOff_X1(pcrel_by_instr);
-	} else {
-		/* opcode: j addr */
-		opcode_x1 =
-			create_Opcode_X1(JUMP_OPCODE_X1) |
-			create_JumpOpcodeExtension_X1(J_JUMP_OPCODE_X1) |
-			create_JumpOff_X1(pcrel_by_instr);
-	}
-
-	/*
-	 * Also put { move r10, lr; jal ftrace_stub } in a bundle, which
-	 * is used to replace the instruction in address ftrace_call.
-	 */
-	if (addr == FTRACE_ADDR || addr == (unsigned long)ftrace_stub) {
-		/* opcode: or r10, lr, zero */
-		opcode_x0 =
-			create_Dest_X0(10) |
-			create_SrcA_X0(TREG_LR) |
-			create_SrcB_X0(TREG_ZERO) |
-			create_RRROpcodeExtension_X0(OR_RRR_0_OPCODE_X0) |
-			create_Opcode_X0(RRR_0_OPCODE_X0);
-	} else {
-		/* opcode: fnop */
-		opcode_x0 =
-			create_UnaryOpcodeExtension_X0(FNOP_UNARY_OPCODE_X0) |
-			create_RRROpcodeExtension_X0(UNARY_RRR_0_OPCODE_X0) |
-			create_Opcode_X0(RRR_0_OPCODE_X0);
-	}
-
-	return opcode_x1 | opcode_x0;
-}
-
-static unsigned long ftrace_nop_replace(struct dyn_ftrace *rec)
-{
-	return NOP();
-}
-
-static unsigned long ftrace_call_replace(unsigned long pc, unsigned long addr)
-{
-	return ftrace_gen_branch(pc, addr, true);
-}
-
-static int ftrace_modify_code(unsigned long pc, unsigned long old,
-			      unsigned long new)
-{
-	unsigned long pc_wr;
-
-	/* Check if the address is in kernel text space and module space. */
-	if (!kernel_text_address(pc))
-		return -EINVAL;
-
-	/* Operate on writable kernel text mapping. */
-	pc_wr = ktext_writable_addr(pc);
-
-	if (probe_kernel_write((void *)pc_wr, &new, MCOUNT_INSN_SIZE))
-		return -EPERM;
-
-	smp_wmb();
-
-	if (!machine_stopped && num_online_cpus() > 1)
-		flush_icache_range(pc, pc + MCOUNT_INSN_SIZE);
-
-	return 0;
-}
-
-int ftrace_update_ftrace_func(ftrace_func_t func)
-{
-	unsigned long pc, old;
-	unsigned long new;
-	int ret;
-
-	pc = (unsigned long)&ftrace_call;
-	memcpy(&old, &ftrace_call, MCOUNT_INSN_SIZE);
-	new = ftrace_call_replace(pc, (unsigned long)func);
-
-	ret = ftrace_modify_code(pc, old, new);
-
-	return ret;
-}
-
-int ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
-{
-	unsigned long new, old;
-	unsigned long ip = rec->ip;
-
-	old = ftrace_nop_replace(rec);
-	new = ftrace_call_replace(ip, addr);
-
-	return ftrace_modify_code(rec->ip, old, new);
-}
-
-int ftrace_make_nop(struct module *mod,
-		    struct dyn_ftrace *rec, unsigned long addr)
-{
-	unsigned long ip = rec->ip;
-	unsigned long old;
-	unsigned long new;
-	int ret;
-
-	old = ftrace_call_replace(ip, addr);
-	new = ftrace_nop_replace(rec);
-	ret = ftrace_modify_code(ip, old, new);
-
-	return ret;
-}
-
-int __init ftrace_dyn_arch_init(void)
-{
-	return 0;
-}
-#endif /* CONFIG_DYNAMIC_FTRACE */
-
-#ifdef CONFIG_FUNCTION_GRAPH_TRACER
-void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
-			   unsigned long frame_pointer)
-{
-	unsigned long return_hooker = (unsigned long) &return_to_handler;
-	struct ftrace_graph_ent trace;
-	unsigned long old;
-	int err;
-
-	if (unlikely(atomic_read(&current->tracing_graph_pause)))
-		return;
-
-	old = *parent;
-	*parent = return_hooker;
-
-	err = ftrace_push_return_trace(old, self_addr, &trace.depth,
-				       frame_pointer, NULL);
-	if (err == -EBUSY) {
-		*parent = old;
-		return;
-	}
-
-	trace.func = self_addr;
-
-	/* Only trace if the calling function expects to */
-	if (!ftrace_graph_entry(&trace)) {
-		current->curr_ret_stack--;
-		*parent = old;
-	}
-}
-
-#ifdef CONFIG_DYNAMIC_FTRACE
-extern unsigned long ftrace_graph_call;
-
-static int __ftrace_modify_caller(unsigned long *callsite,
-				  void (*func) (void), bool enable)
-{
-	unsigned long caller_fn = (unsigned long) func;
-	unsigned long pc = (unsigned long) callsite;
-	unsigned long branch = ftrace_gen_branch(pc, caller_fn, false);
-	unsigned long nop = NOP();
-	unsigned long old = enable ? nop : branch;
-	unsigned long new = enable ? branch : nop;
-
-	return ftrace_modify_code(pc, old, new);
-}
-
-static int ftrace_modify_graph_caller(bool enable)
-{
-	int ret;
-
-	ret = __ftrace_modify_caller(&ftrace_graph_call,
-				     ftrace_graph_caller,
-				     enable);
-
-	return ret;
-}
-
-int ftrace_enable_ftrace_graph_caller(void)
-{
-	return ftrace_modify_graph_caller(true);
-}
-
-int ftrace_disable_ftrace_graph_caller(void)
-{
-	return ftrace_modify_graph_caller(false);
-}
-#endif /* CONFIG_DYNAMIC_FTRACE */
-#endif /* CONFIG_FUNCTION_GRAPH_TRACER */