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   - unicore32 and hexagon both have very outdated gcc releases, but the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

5 files changed, 4 insertions, 54 deletions

diff --git a/mm/Kconfig b/mm/Kconfig
index c782e8fb7235..d5004d82a1d6 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -278,13 +278,6 @@ config BOUNCE
 	  by default when ZONE_DMA or HIGHMEM is selected, but you
 	  may say n to override this.
 
-# On the 'tile' arch, USB OHCI needs the bounce pool since tilegx will often
-# have more than 4GB of memory, but we don't currently use the IOTLB to present
-# a 32-bit address to OHCI.  So we need to use a bounce pool instead.
-config NEED_BOUNCE_POOL
-	bool
-	default y if TILE && USB_OHCI_HCD
-
 config NR_QUICK
 	int
 	depends on QUICKLIST
@@ -627,15 +620,14 @@ config GENERIC_EARLY_IOREMAP
 config MAX_STACK_SIZE_MB
 	int "Maximum user stack size for 32-bit processes (MB)"
 	default 80
-	range 8 256 if METAG
 	range 8 2048
 	depends on STACK_GROWSUP && (!64BIT || COMPAT)
 	help
 	  This is the maximum stack size in Megabytes in the VM layout of 32-bit
 	  user processes when the stack grows upwards (currently only on parisc
-	  and metag arch). The stack will be located at the highest memory
-	  address minus the given value, unless the RLIMIT_STACK hard limit is
-	  changed to a smaller value in which case that is used.
+	  arch). The stack will be located at the highest memory address minus
+	  the given value, unless the RLIMIT_STACK hard limit is changed to a
+	  smaller value in which case that is used.
 
 	  A sane initial value is 80 MB.
 
diff --git a/mm/nommu.c b/mm/nommu.c
index ebb6e618dade..838a8fdec5c2 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -663,22 +663,6 @@ static void put_nommu_region(struct vm_region *region)
 }
 
 /*
- * update protection on a vma
- */
-static void protect_vma(struct vm_area_struct *vma, unsigned long flags)
-{
-#ifdef CONFIG_MPU
-	struct mm_struct *mm = vma->vm_mm;
-	long start = vma->vm_start & PAGE_MASK;
-	while (start < vma->vm_end) {
-		protect_page(mm, start, flags);
-		start += PAGE_SIZE;
-	}
-	update_protections(mm);
-#endif
-}
-
-/*
  * add a VMA into a process's mm_struct in the appropriate place in the list
  * and tree and add to the address space's page tree also if not an anonymous
  * page
@@ -695,8 +679,6 @@ static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
 	mm->map_count++;
 	vma->vm_mm = mm;
 
-	protect_vma(vma, vma->vm_flags);
-
 	/* add the VMA to the mapping */
 	if (vma->vm_file) {
 		mapping = vma->vm_file->f_mapping;
@@ -757,8 +739,6 @@ static void delete_vma_from_mm(struct vm_area_struct *vma)
 	struct mm_struct *mm = vma->vm_mm;
 	struct task_struct *curr = current;
 
-	protect_vma(vma, 0);
-
 	mm->map_count--;
 	for (i = 0; i < VMACACHE_SIZE; i++) {
 		/* if the vma is cached, invalidate the entire cache */
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1741dd23e7c1..4ea018263210 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -6192,10 +6192,7 @@ static void __ref alloc_node_mem_map(struct pglist_data *pgdat)
 		end = pgdat_end_pfn(pgdat);
 		end = ALIGN(end, MAX_ORDER_NR_PAGES);
 		size =  (end - start) * sizeof(struct page);
-		map = alloc_remap(pgdat->node_id, size);
-		if (!map)
-			map = memblock_virt_alloc_node_nopanic(size,
-							       pgdat->node_id);
+		map = memblock_virt_alloc_node_nopanic(size, pgdat->node_id);
 		pgdat->node_mem_map = map + offset;
 	}
 	pr_debug("%s: node %d, pgdat %08lx, node_mem_map %08lx\n",
diff --git a/mm/percpu.c b/mm/percpu.c
index 9297098519a6..0b6480979ac7 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -2740,11 +2740,7 @@ void __init setup_per_cpu_areas(void)
 
 	if (pcpu_setup_first_chunk(ai, fc) < 0)
 		panic("Failed to initialize percpu areas.");
-#ifdef CONFIG_CRIS
-#warning "the CRIS architecture has physical and virtual addresses confused"
-#else
 	pcpu_free_alloc_info(ai);
-#endif
 }
 
 #endif	/* CONFIG_SMP */
diff --git a/mm/sparse.c b/mm/sparse.c
index 79b26f98d793..58cab483e81b 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -405,10 +405,6 @@ struct page __init *sparse_mem_map_populate(unsigned long pnum, int nid,
 	struct page *map;
 	unsigned long size;
 
-	map = alloc_remap(nid, sizeof(struct page) * PAGES_PER_SECTION);
-	if (map)
-		return map;
-
 	size = PAGE_ALIGN(sizeof(struct page) * PAGES_PER_SECTION);
 	map = memblock_virt_alloc_try_nid(size,
 					  PAGE_SIZE, __pa(MAX_DMA_ADDRESS),
@@ -424,17 +420,6 @@ void __init sparse_mem_maps_populate_node(struct page **map_map,
 	unsigned long pnum;
 	unsigned long size = sizeof(struct page) * PAGES_PER_SECTION;
 
-	map = alloc_remap(nodeid, size * map_count);
-	if (map) {
-		for (pnum = pnum_begin; pnum < pnum_end; pnum++) {
-			if (!present_section_nr(pnum))
-				continue;
-			map_map[pnum] = map;
-			map += size;
-		}
-		return;
-	}
-
 	size = PAGE_ALIGN(size);
 	map = memblock_virt_alloc_try_nid_raw(size * map_count,
 					      PAGE_SIZE, __pa(MAX_DMA_ADDRESS),