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   - unicore32 and hexagon both have very outdated gcc releases, but the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, 298 deletions

diff --git a/arch/tile/kernel/machine_kexec.c b/arch/tile/kernel/machine_kexec.c
deleted file mode 100644
index 008aa2faef55..000000000000
--- a/arch/tile/kernel/machine_kexec.c
+++ /dev/null
@@ -1,298 +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.
- *
- * based on machine_kexec.c from other architectures in linux-2.6.18
- */
-
-#include <linux/mm.h>
-#include <linux/kexec.h>
-#include <linux/delay.h>
-#include <linux/reboot.h>
-#include <linux/errno.h>
-#include <linux/vmalloc.h>
-#include <linux/cpumask.h>
-#include <linux/kernel.h>
-#include <linux/elf.h>
-#include <linux/highmem.h>
-#include <linux/mmu_context.h>
-#include <linux/io.h>
-#include <linux/timex.h>
-#include <asm/pgtable.h>
-#include <asm/pgalloc.h>
-#include <asm/cacheflush.h>
-#include <asm/checksum.h>
-#include <asm/tlbflush.h>
-#include <asm/homecache.h>
-#include <hv/hypervisor.h>
-
-
-/*
- * This stuff is not in elf.h and is not in any other kernel include.
- * This stuff is needed below in the little boot notes parser to
- * extract the command line so we can pass it to the hypervisor.
- */
-struct Elf32_Bhdr {
-	Elf32_Word b_signature;
-	Elf32_Word b_size;
-	Elf32_Half b_checksum;
-	Elf32_Half b_records;
-};
-#define ELF_BOOT_MAGIC		0x0E1FB007
-#define EBN_COMMAND_LINE	0x00000004
-#define roundupsz(X) (((X) + 3) & ~3)
-
-/* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - */
-
-
-void machine_shutdown(void)
-{
-	/*
-	 * Normally we would stop all the other processors here, but
-	 * the check in machine_kexec_prepare below ensures we'll only
-	 * get this far if we've been booted with "nosmp" on the
-	 * command line or without CONFIG_SMP so there's nothing to do
-	 * here (for now).
-	 */
-}
-
-void machine_crash_shutdown(struct pt_regs *regs)
-{
-	/*
-	 * Cannot happen.  This type of kexec is disabled on this
-	 * architecture (and enforced in machine_kexec_prepare below).
-	 */
-}
-
-
-int machine_kexec_prepare(struct kimage *image)
-{
-	if (num_online_cpus() > 1) {
-		pr_warn("%s: detected attempt to kexec with num_online_cpus() > 1\n",
-			__func__);
-		return -ENOSYS;
-	}
-	if (image->type != KEXEC_TYPE_DEFAULT) {
-		pr_warn("%s: detected attempt to kexec with unsupported type: %d\n",
-			__func__, image->type);
-		return -ENOSYS;
-	}
-	return 0;
-}
-
-void machine_kexec_cleanup(struct kimage *image)
-{
-	/*
-	 * We did nothing in machine_kexec_prepare,
-	 * so we have nothing to do here.
-	 */
-}
-
-/*
- * If we can find elf boot notes on this page, return the command
- * line.  Otherwise, silently return null.  Somewhat kludgy, but no
- * good way to do this without significantly rearchitecting the
- * architecture-independent kexec code.
- */
-
-static unsigned char *kexec_bn2cl(void *pg)
-{
-	struct Elf32_Bhdr *bhdrp;
-	Elf32_Nhdr *nhdrp;
-	unsigned char *desc;
-	unsigned char *command_line;
-	__sum16 csum;
-
-	bhdrp = (struct Elf32_Bhdr *) pg;
-
-	/*
-	 * This routine is invoked for every source page, so make
-	 * sure to quietly ignore every impossible page.
-	 */
-	if (bhdrp->b_signature != ELF_BOOT_MAGIC ||
-	    bhdrp->b_size > PAGE_SIZE)
-		return 0;
-
-	/*
-	 * If we get a checksum mismatch, warn with the checksum
-	 * so we can diagnose better.
-	 */
-	csum = ip_compute_csum(pg, bhdrp->b_size);
-	if (csum != 0) {
-		pr_warn("%s: bad checksum %#x (size %d)\n",
-			__func__, csum, bhdrp->b_size);
-		return 0;
-	}
-
-	nhdrp = (Elf32_Nhdr *) (bhdrp + 1);
-
-	while (nhdrp->n_type != EBN_COMMAND_LINE) {
-
-		desc = (unsigned char *) (nhdrp + 1);
-		desc += roundupsz(nhdrp->n_descsz);
-
-		nhdrp = (Elf32_Nhdr *) desc;
-
-		/* still in bounds? */
-		if ((unsigned char *) (nhdrp + 1) >
-		    ((unsigned char *) pg) + bhdrp->b_size) {
-
-			pr_info("%s: out of bounds\n", __func__);
-			return 0;
-		}
-	}
-
-	command_line = (unsigned char *) (nhdrp + 1);
-	desc = command_line;
-
-	while (*desc != '\0') {
-		desc++;
-		if (((unsigned long)desc & PAGE_MASK) != (unsigned long)pg) {
-			pr_info("%s: ran off end of page\n", __func__);
-			return 0;
-		}
-	}
-
-	return command_line;
-}
-
-static void kexec_find_and_set_command_line(struct kimage *image)
-{
-	kimage_entry_t *ptr, entry;
-
-	unsigned char *command_line = 0;
-	unsigned char *r;
-	HV_Errno hverr;
-
-	for (ptr = &image->head;
-	     (entry = *ptr) && !(entry & IND_DONE);
-	     ptr = (entry & IND_INDIRECTION) ?
-		     phys_to_virt((entry & PAGE_MASK)) : ptr + 1) {
-
-		if ((entry & IND_SOURCE)) {
-			void *va =
-				kmap_atomic_pfn(entry >> PAGE_SHIFT);
-			r = kexec_bn2cl(va);
-			if (r) {
-				command_line = r;
-				break;
-			}
-			kunmap_atomic(va);
-		}
-	}
-
-	if (command_line != 0) {
-		pr_info("setting new command line to \"%s\"\n", command_line);
-
-		hverr = hv_set_command_line(
-			(HV_VirtAddr) command_line, strlen(command_line));
-		kunmap_atomic(command_line);
-	} else {
-		pr_info("%s: no command line found; making empty\n", __func__);
-		hverr = hv_set_command_line((HV_VirtAddr) command_line, 0);
-	}
-	if (hverr)
-		pr_warn("%s: hv_set_command_line returned error: %d\n",
-			__func__, hverr);
-}
-
-/*
- * The kexec code range-checks all its PAs, so to avoid having it run
- * amok and allocate memory and then sequester it from every other
- * controller, we force it to come from controller zero.  We also
- * disable the oom-killer since if we do end up running out of memory,
- * that almost certainly won't help.
- */
-struct page *kimage_alloc_pages_arch(gfp_t gfp_mask, unsigned int order)
-{
-	gfp_mask |= __GFP_THISNODE | __GFP_NORETRY;
-	return alloc_pages_node(0, gfp_mask, order);
-}
-
-/*
- * Address range in which pa=va mapping is set in setup_quasi_va_is_pa().
- * For tilepro, PAGE_OFFSET is used since this is the largest possbile value
- * for tilepro, while for tilegx, we limit it to entire middle level page
- * table which we assume has been allocated and is undoubtedly large enough.
- */
-#ifndef __tilegx__
-#define	QUASI_VA_IS_PA_ADDR_RANGE PAGE_OFFSET
-#else
-#define	QUASI_VA_IS_PA_ADDR_RANGE PGDIR_SIZE
-#endif
-
-static void setup_quasi_va_is_pa(void)
-{
-	HV_PTE pte;
-	unsigned long i;
-
-	/*
-	 * Flush our TLB to prevent conflicts between the previous contents
-	 * and the new stuff we're about to add.
-	 */
-	local_flush_tlb_all();
-
-	/*
-	 * setup VA is PA, at least up to QUASI_VA_IS_PA_ADDR_RANGE.
-	 * Note here we assume that level-1 page table is defined by
-	 * HPAGE_SIZE.
-	 */
-	pte = hv_pte(_PAGE_KERNEL | _PAGE_HUGE_PAGE);
-	pte = hv_pte_set_mode(pte, HV_PTE_MODE_CACHE_NO_L3);
-	for (i = 0; i < (QUASI_VA_IS_PA_ADDR_RANGE >> HPAGE_SHIFT); i++) {
-		unsigned long vaddr = i << HPAGE_SHIFT;
-		pgd_t *pgd = pgd_offset(current->mm, vaddr);
-		pud_t *pud = pud_offset(pgd, vaddr);
-		pte_t *ptep = (pte_t *) pmd_offset(pud, vaddr);
-		unsigned long pfn = i << (HPAGE_SHIFT - PAGE_SHIFT);
-
-		if (pfn_valid(pfn))
-			__set_pte(ptep, pfn_pte(pfn, pte));
-	}
-}
-
-
-void machine_kexec(struct kimage *image)
-{
-	void *reboot_code_buffer;
-	pte_t *ptep;
-	void (*rnk)(unsigned long, void *, unsigned long)
-		__noreturn;
-
-	/* Mask all interrupts before starting to reboot. */
-	interrupt_mask_set_mask(~0ULL);
-
-	kexec_find_and_set_command_line(image);
-
-	/*
-	 * Adjust the home caching of the control page to be cached on
-	 * this cpu, and copy the assembly helper into the control
-	 * code page, which we map in the vmalloc area.
-	 */
-	homecache_change_page_home(image->control_code_page, 0,
-				   smp_processor_id());
-	reboot_code_buffer = page_address(image->control_code_page);
-	BUG_ON(reboot_code_buffer == NULL);
-	ptep = virt_to_pte(NULL, (unsigned long)reboot_code_buffer);
-	__set_pte(ptep, pte_mkexec(*ptep));
-	memcpy(reboot_code_buffer, relocate_new_kernel,
-	       relocate_new_kernel_size);
-	__flush_icache_range(
-		(unsigned long) reboot_code_buffer,
-		(unsigned long) reboot_code_buffer + relocate_new_kernel_size);
-
-	setup_quasi_va_is_pa();
-
-	/* now call it */
-	rnk = reboot_code_buffer;
-	(*rnk)(image->head, reboot_code_buffer, image->start);
-}