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   - unicore32 and hexagon both have very outdated gcc releases, but the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, 411 deletions

diff --git a/arch/tile/kernel/signal.c b/arch/tile/kernel/signal.c
deleted file mode 100644
index f2bf557bb005..000000000000
--- a/arch/tile/kernel/signal.c
+++ /dev/null
@@ -1,411 +0,0 @@
-/*
- * Copyright (C) 1991, 1992  Linus Torvalds
- * 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.
- */
-
-#include <linux/sched.h>
-#include <linux/sched/debug.h>
-#include <linux/sched/task_stack.h>
-#include <linux/mm.h>
-#include <linux/smp.h>
-#include <linux/kernel.h>
-#include <linux/signal.h>
-#include <linux/errno.h>
-#include <linux/wait.h>
-#include <linux/unistd.h>
-#include <linux/stddef.h>
-#include <linux/personality.h>
-#include <linux/suspend.h>
-#include <linux/ptrace.h>
-#include <linux/elf.h>
-#include <linux/compat.h>
-#include <linux/syscalls.h>
-#include <linux/uaccess.h>
-#include <asm/processor.h>
-#include <asm/ucontext.h>
-#include <asm/sigframe.h>
-#include <asm/syscalls.h>
-#include <asm/vdso.h>
-#include <arch/interrupts.h>
-
-#define DEBUG_SIG 0
-
-/*
- * Do a signal return; undo the signal stack.
- */
-
-int restore_sigcontext(struct pt_regs *regs,
-		       struct sigcontext __user *sc)
-{
-	int err;
-
-	/* Always make any pending restarted system calls return -EINTR */
-	current->restart_block.fn = do_no_restart_syscall;
-
-	/*
-	 * Enforce that sigcontext is like pt_regs, and doesn't mess
-	 * up our stack alignment rules.
-	 */
-	BUILD_BUG_ON(sizeof(struct sigcontext) != sizeof(struct pt_regs));
-	BUILD_BUG_ON(sizeof(struct sigcontext) % 8 != 0);
-	err = __copy_from_user(regs, sc, sizeof(*regs));
-
-	/* Ensure that the PL is always set to USER_PL. */
-	regs->ex1 = PL_ICS_EX1(USER_PL, EX1_ICS(regs->ex1));
-
-	regs->faultnum = INT_SWINT_1_SIGRETURN;
-
-	return err;
-}
-
-void signal_fault(const char *type, struct pt_regs *regs,
-		  void __user *frame, int sig)
-{
-	trace_unhandled_signal(type, regs, (unsigned long)frame, SIGSEGV);
-	force_sigsegv(sig, current);
-}
-
-/* The assembly shim for this function arranges to ignore the return value. */
-SYSCALL_DEFINE0(rt_sigreturn)
-{
-	struct pt_regs *regs = current_pt_regs();
-	struct rt_sigframe __user *frame =
-		(struct rt_sigframe __user *)(regs->sp);
-	sigset_t set;
-
-	if (!access_ok(VERIFY_READ, frame, sizeof(*frame)))
-		goto badframe;
-	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
-		goto badframe;
-
-	set_current_blocked(&set);
-
-	if (restore_sigcontext(regs, &frame->uc.uc_mcontext))
-		goto badframe;
-
-	if (restore_altstack(&frame->uc.uc_stack))
-		goto badframe;
-
-	return 0;
-
-badframe:
-	signal_fault("bad sigreturn frame", regs, frame, 0);
-	return 0;
-}
-
-/*
- * Set up a signal frame.
- */
-
-int setup_sigcontext(struct sigcontext __user *sc, struct pt_regs *regs)
-{
-	return  __copy_to_user(sc, regs, sizeof(*regs));
-}
-
-/*
- * Determine which stack to use..
- */
-static inline void __user *get_sigframe(struct k_sigaction *ka,
-					struct pt_regs *regs,
-					size_t frame_size)
-{
-	unsigned long sp;
-
-	/* Default to using normal stack */
-	sp = regs->sp;
-
-	/*
-	 * If we are on the alternate signal stack and would overflow
-	 * it, don't.  Return an always-bogus address instead so we
-	 * will die with SIGSEGV.
-	 */
-	if (on_sig_stack(sp) && !likely(on_sig_stack(sp - frame_size)))
-		return (void __user __force *)-1UL;
-
-	/* This is the X/Open sanctioned signal stack switching.  */
-	if (ka->sa.sa_flags & SA_ONSTACK) {
-		if (sas_ss_flags(sp) == 0)
-			sp = current->sas_ss_sp + current->sas_ss_size;
-	}
-
-	sp -= frame_size;
-	/*
-	 * Align the stack pointer according to the TILE ABI,
-	 * i.e. so that on function entry (sp & 15) == 0.
-	 */
-	sp &= -16UL;
-	return (void __user *) sp;
-}
-
-static int setup_rt_frame(struct ksignal *ksig, sigset_t *set,
-			  struct pt_regs *regs)
-{
-	unsigned long restorer;
-	struct rt_sigframe __user *frame;
-	int err = 0, sig = ksig->sig;
-
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame));
-
-	if (!access_ok(VERIFY_WRITE, frame, sizeof(*frame)))
-		goto err;
-
-	/* Always write at least the signal number for the stack backtracer. */
-	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
-		/* At sigreturn time, restore the callee-save registers too. */
-		err |= copy_siginfo_to_user(&frame->info, &ksig->info);
-		regs->flags |= PT_FLAGS_RESTORE_REGS;
-	} else {
-		err |= __put_user(ksig->info.si_signo, &frame->info.si_signo);
-	}
-
-	/* Create the ucontext.  */
-	err |= __clear_user(&frame->save_area, sizeof(frame->save_area));
-	err |= __put_user(0, &frame->uc.uc_flags);
-	err |= __put_user(NULL, &frame->uc.uc_link);
-	err |= __save_altstack(&frame->uc.uc_stack, regs->sp);
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, regs);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-	if (err)
-		goto err;
-
-	restorer = VDSO_SYM(&__vdso_rt_sigreturn);
-	if (ksig->ka.sa.sa_flags & SA_RESTORER)
-		restorer = (unsigned long) ksig->ka.sa.sa_restorer;
-
-	/*
-	 * Set up registers for signal handler.
-	 * Registers that we don't modify keep the value they had from
-	 * user-space at the time we took the signal.
-	 * We always pass siginfo and mcontext, regardless of SA_SIGINFO,
-	 * since some things rely on this (e.g. glibc's debug/segfault.c).
-	 */
-	regs->pc = (unsigned long) ksig->ka.sa.sa_handler;
-	regs->ex1 = PL_ICS_EX1(USER_PL, 1); /* set crit sec in handler */
-	regs->sp = (unsigned long) frame;
-	regs->lr = restorer;
-	regs->regs[0] = (unsigned long) sig;
-	regs->regs[1] = (unsigned long) &frame->info;
-	regs->regs[2] = (unsigned long) &frame->uc;
-	regs->flags |= PT_FLAGS_CALLER_SAVES;
-	return 0;
-
-err:
-	trace_unhandled_signal("bad sigreturn frame", regs,
-			      (unsigned long)frame, SIGSEGV);
-	return -EFAULT;
-}
-
-/*
- * OK, we're invoking a handler
- */
-
-static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
-{
-	sigset_t *oldset = sigmask_to_save();
-	int ret;
-
-	/* Are we from a system call? */
-	if (regs->faultnum == INT_SWINT_1) {
-		/* If so, check system call restarting.. */
-		switch (regs->regs[0]) {
-		case -ERESTART_RESTARTBLOCK:
-		case -ERESTARTNOHAND:
-			regs->regs[0] = -EINTR;
-			break;
-
-		case -ERESTARTSYS:
-			if (!(ksig->ka.sa.sa_flags & SA_RESTART)) {
-				regs->regs[0] = -EINTR;
-				break;
-			}
-			/* fallthrough */
-		case -ERESTARTNOINTR:
-			/* Reload caller-saves to restore r0..r5 and r10. */
-			regs->flags |= PT_FLAGS_CALLER_SAVES;
-			regs->regs[0] = regs->orig_r0;
-			regs->pc -= 8;
-		}
-	}
-
-	/* Set up the stack frame */
-#ifdef CONFIG_COMPAT
-	if (is_compat_task())
-		ret = compat_setup_rt_frame(ksig, oldset, regs);
-	else
-#endif
-		ret = setup_rt_frame(ksig, oldset, regs);
-
-	signal_setup_done(ret, ksig, test_thread_flag(TIF_SINGLESTEP));
-}
-
-/*
- * Note that 'init' is a special process: it doesn't get signals it doesn't
- * want to handle. Thus you cannot kill init even with a SIGKILL even by
- * mistake.
- */
-void do_signal(struct pt_regs *regs)
-{
-	struct ksignal ksig;
-
-	/*
-	 * i386 will check if we're coming from kernel mode and bail out
-	 * here.  In my experience this just turns weird crashes into
-	 * weird spin-hangs.  But if we find a case where this seems
-	 * helpful, we can reinstate the check on "!user_mode(regs)".
-	 */
-
-	if (get_signal(&ksig)) {
-		/* Whee! Actually deliver the signal.  */
-		handle_signal(&ksig, regs);
-		goto done;
-	}
-
-	/* Did we come from a system call? */
-	if (regs->faultnum == INT_SWINT_1) {
-		/* Restart the system call - no handlers present */
-		switch (regs->regs[0]) {
-		case -ERESTARTNOHAND:
-		case -ERESTARTSYS:
-		case -ERESTARTNOINTR:
-			regs->flags |= PT_FLAGS_CALLER_SAVES;
-			regs->regs[0] = regs->orig_r0;
-			regs->pc -= 8;
-			break;
-
-		case -ERESTART_RESTARTBLOCK:
-			regs->flags |= PT_FLAGS_CALLER_SAVES;
-			regs->regs[TREG_SYSCALL_NR] = __NR_restart_syscall;
-			regs->pc -= 8;
-			break;
-		}
-	}
-
-	/* If there's no signal to deliver, just put the saved sigmask back. */
-	restore_saved_sigmask();
-
-done:
-	/* Avoid double syscall restart if there are nested signals. */
-	regs->faultnum = INT_SWINT_1_SIGRETURN;
-}
-
-int show_unhandled_signals = 1;
-
-static int __init crashinfo(char *str)
-{
-	const char *word;
-
-	if (*str == '\0')
-		show_unhandled_signals = 2;
-	else if (*str != '=' || kstrtoint(++str, 0, &show_unhandled_signals) != 0)
-		return 0;
-
-	switch (show_unhandled_signals) {
-	case 0:
-		word = "No";
-		break;
-	case 1:
-		word = "One-line";
-		break;
-	default:
-		word = "Detailed";
-		break;
-	}
-	pr_info("%s crash reports will be generated on the console\n", word);
-	return 1;
-}
-__setup("crashinfo", crashinfo);
-
-static void dump_mem(void __user *address)
-{
-	void __user *addr;
-	enum { region_size = 256, bytes_per_line = 16 };
-	int i, j, k;
-	int found_readable_mem = 0;
-
-	if (!access_ok(VERIFY_READ, address, 1)) {
-		pr_err("Not dumping at address 0x%lx (kernel address)\n",
-		       (unsigned long)address);
-		return;
-	}
-
-	addr = (void __user *)
-		(((unsigned long)address & -bytes_per_line) - region_size/2);
-	if (addr > address)
-		addr = NULL;
-	for (i = 0; i < region_size;
-	     addr += bytes_per_line, i += bytes_per_line) {
-		unsigned char buf[bytes_per_line];
-		char line[100];
-		if (copy_from_user(buf, addr, bytes_per_line))
-			continue;
-		if (!found_readable_mem) {
-			pr_err("Dumping memory around address 0x%lx:\n",
-			       (unsigned long)address);
-			found_readable_mem = 1;
-		}
-		j = sprintf(line, REGFMT ":", (unsigned long)addr);
-		for (k = 0; k < bytes_per_line; ++k)
-			j += sprintf(&line[j], " %02x", buf[k]);
-		pr_err("%s\n", line);
-	}
-	if (!found_readable_mem)
-		pr_err("No readable memory around address 0x%lx\n",
-		       (unsigned long)address);
-}
-
-void trace_unhandled_signal(const char *type, struct pt_regs *regs,
-			    unsigned long address, int sig)
-{
-	struct task_struct *tsk = current;
-
-	if (show_unhandled_signals == 0)
-		return;
-
-	/* If the signal is handled, don't show it here. */
-	if (!is_global_init(tsk)) {
-		void __user *handler =
-			tsk->sighand->action[sig-1].sa.sa_handler;
-		if (handler != SIG_IGN && handler != SIG_DFL)
-			return;
-	}
-
-	/* Rate-limit the one-line output, not the detailed output. */
-	if (show_unhandled_signals <= 1 && !printk_ratelimit())
-		return;
-
-	printk("%s%s[%d]: %s at %lx pc "REGFMT" signal %d",
-	       task_pid_nr(tsk) > 1 ? KERN_INFO : KERN_EMERG,
-	       tsk->comm, task_pid_nr(tsk), type, address, regs->pc, sig);
-
-	print_vma_addr(KERN_CONT " in ", regs->pc);
-
-	printk(KERN_CONT "\n");
-
-	if (show_unhandled_signals > 1) {
-		switch (sig) {
-		case SIGILL:
-		case SIGFPE:
-		case SIGSEGV:
-		case SIGBUS:
-			pr_err("User crash: signal %d, trap %ld, address 0x%lx\n",
-			       sig, regs->faultnum, address);
-			show_regs(regs);
-			dump_mem((void __user *)address);
-			break;
-		default:
-			pr_err("User crash: signal %d, trap %ld\n",
-			       sig, regs->faultnum);
-			break;
-		}
-	}
-}