metag: Remove arch/metag/

The earliest Meta architecture port of Linux I have a record of was an
import of a Meta port of Linux v2.4.1 in February 2004, which was worked
on significantly over the next few years by Graham Whaley, Will Newton,
Matt Fleming, myself and others.

Eventually the port was merged into mainline in v3.9 in March 2013, not
long after Imagination Technologies bought MIPS Technologies and shifted
its CPU focus over to the MIPS architecture.

As a result, though the port was maintained for a while, kept on life
support for a while longer, and useful for testing a few specific
drivers for which I don't have ready access to the equivalent MIPS
hardware, it is now essentially dead with no users.

It is also stuck using an out-of-tree toolchain based on GCC 4.2.4 which
is no longer maintained, now struggles to build modern kernels due to
toolchain bugs, and doesn't itself build with a modern GCC. The latest
buildroot port is still using an old uClibc snapshot which is no longer
served, and the latest uClibc doesn't build with GCC 4.2.4.

So lets call it a day and drop the Meta architecture port from the
kernel. RIP Meta.

Signed-off-by: James Hogan <jhogan@kernel.org>
Link: https://lkml.kernel.org/r/95906b76-6ce1-3f84-eaba-c29b4ae952eb@roeck-us.net
Reviewed-by: Guenter Roeck <linux@roeck-us.net>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Graham Whaley <graham.whaley@gmail.com>
Cc: linux-metag@vger.kernel.org

1 files changed, 0 insertions, 251 deletions

diff --git a/arch/metag/mm/hugetlbpage.c b/arch/metag/mm/hugetlbpage.c
deleted file mode 100644
index 012ee4c..0000000
--- a/arch/metag/mm/hugetlbpage.c
+++ /dev/null
@@ -1,251 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * arch/metag/mm/hugetlbpage.c
- *
- * METAG HugeTLB page support.
- *
- * Cloned from SuperH
- *
- * Cloned from sparc64 by Paul Mundt.
- *
- * Copyright (C) 2002, 2003 David S. Miller (davem@redhat.com)
- */
-
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/mm.h>
-#include <linux/hugetlb.h>
-#include <linux/pagemap.h>
-#include <linux/sysctl.h>
-
-#include <asm/mman.h>
-#include <asm/pgalloc.h>
-#include <asm/tlb.h>
-#include <asm/tlbflush.h>
-#include <asm/cacheflush.h>
-
-/*
- * If the arch doesn't supply something else, assume that hugepage
- * size aligned regions are ok without further preparation.
- */
-int prepare_hugepage_range(struct file *file, unsigned long addr,
-						unsigned long len)
-{
-	struct mm_struct *mm = current->mm;
-	struct hstate *h = hstate_file(file);
-	struct vm_area_struct *vma;
-
-	if (len & ~huge_page_mask(h))
-		return -EINVAL;
-	if (addr & ~huge_page_mask(h))
-		return -EINVAL;
-	if (TASK_SIZE - len < addr)
-		return -EINVAL;
-
-	vma = find_vma(mm, ALIGN_HUGEPT(addr));
-	if (vma && !(vma->vm_flags & MAP_HUGETLB))
-		return -EINVAL;
-
-	vma = find_vma(mm, addr);
-	if (vma) {
-		if (addr + len > vma->vm_start)
-			return -EINVAL;
-		if (!(vma->vm_flags & MAP_HUGETLB) &&
-		    (ALIGN_HUGEPT(addr + len) > vma->vm_start))
-			return -EINVAL;
-	}
-	return 0;
-}
-
-pte_t *huge_pte_alloc(struct mm_struct *mm,
-			unsigned long addr, unsigned long sz)
-{
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte;
-
-	pgd = pgd_offset(mm, addr);
-	pud = pud_offset(pgd, addr);
-	pmd = pmd_offset(pud, addr);
-	pte = pte_alloc_map(mm, pmd, addr);
-	pgd->pgd &= ~_PAGE_SZ_MASK;
-	pgd->pgd |= _PAGE_SZHUGE;
-
-	return pte;
-}
-
-pte_t *huge_pte_offset(struct mm_struct *mm,
-		       unsigned long addr, unsigned long sz)
-{
-	pgd_t *pgd;
-	pud_t *pud;
-	pmd_t *pmd;
-	pte_t *pte = NULL;
-
-	pgd = pgd_offset(mm, addr);
-	pud = pud_offset(pgd, addr);
-	pmd = pmd_offset(pud, addr);
-	pte = pte_offset_kernel(pmd, addr);
-
-	return pte;
-}
-
-int pmd_huge(pmd_t pmd)
-{
-	return pmd_page_shift(pmd) > PAGE_SHIFT;
-}
-
-int pud_huge(pud_t pud)
-{
-	return 0;
-}
-
-struct page *follow_huge_pmd(struct mm_struct *mm, unsigned long address,
-			     pmd_t *pmd, int write)
-{
-	return NULL;
-}
-
-#ifdef HAVE_ARCH_HUGETLB_UNMAPPED_AREA
-
-/*
- * Look for an unmapped area starting after another hugetlb vma.
- * There are guaranteed to be no huge pte's spare if all the huge pages are
- * full size (4MB), so in that case compile out this search.
- */
-#if HPAGE_SHIFT == HUGEPT_SHIFT
-static inline unsigned long
-hugetlb_get_unmapped_area_existing(unsigned long len)
-{
-	return 0;
-}
-#else
-static unsigned long
-hugetlb_get_unmapped_area_existing(unsigned long len)
-{
-	struct mm_struct *mm = current->mm;
-	struct vm_area_struct *vma;
-	unsigned long start_addr, addr;
-	int after_huge;
-
-	if (mm->context.part_huge) {
-		start_addr = mm->context.part_huge;
-		after_huge = 1;
-	} else {
-		start_addr = TASK_UNMAPPED_BASE;
-		after_huge = 0;
-	}
-new_search:
-	addr = start_addr;
-
-	for (vma = find_vma(mm, addr); ; vma = vma->vm_next) {
-		if ((!vma && !after_huge) || TASK_SIZE - len < addr) {
-			/*
-			 * Start a new search - just in case we missed
-			 * some holes.
-			 */
-			if (start_addr != TASK_UNMAPPED_BASE) {
-				start_addr = TASK_UNMAPPED_BASE;
-				goto new_search;
-			}
-			return 0;
-		}
-		/* skip ahead if we've aligned right over some vmas */
-		if (vma && vma->vm_end <= addr)
-			continue;
-		/* space before the next vma? */
-		if (after_huge && (!vma || ALIGN_HUGEPT(addr + len)
-			    <= vma->vm_start)) {
-			unsigned long end = addr + len;
-			if (end & HUGEPT_MASK)
-				mm->context.part_huge = end;
-			else if (addr == mm->context.part_huge)
-				mm->context.part_huge = 0;
-			return addr;
-		}
-		if (vma->vm_flags & MAP_HUGETLB) {
-			/* space after a huge vma in 2nd level page table? */
-			if (vma->vm_end & HUGEPT_MASK) {
-				after_huge = 1;
-				/* no need to align to the next PT block */
-				addr = vma->vm_end;
-				continue;
-			}
-		}
-		after_huge = 0;
-		addr = ALIGN_HUGEPT(vma->vm_end);
-	}
-}
-#endif
-
-/* Do a full search to find an area without any nearby normal pages. */
-static unsigned long
-hugetlb_get_unmapped_area_new_pmd(unsigned long len)
-{
-	struct vm_unmapped_area_info info;
-
-	info.flags = 0;
-	info.length = len;
-	info.low_limit = TASK_UNMAPPED_BASE;
-	info.high_limit = TASK_SIZE;
-	info.align_mask = PAGE_MASK & HUGEPT_MASK;
-	info.align_offset = 0;
-	return vm_unmapped_area(&info);
-}
-
-unsigned long
-hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
-		unsigned long len, unsigned long pgoff, unsigned long flags)
-{
-	struct hstate *h = hstate_file(file);
-
-	if (len & ~huge_page_mask(h))
-		return -EINVAL;
-	if (len > TASK_SIZE)
-		return -ENOMEM;
-
-	if (flags & MAP_FIXED) {
-		if (prepare_hugepage_range(file, addr, len))
-			return -EINVAL;
-		return addr;
-	}
-
-	if (addr) {
-		addr = ALIGN(addr, huge_page_size(h));
-		if (!prepare_hugepage_range(file, addr, len))
-			return addr;
-	}
-
-	/*
-	 * Look for an existing hugetlb vma with space after it (this is to to
-	 * minimise fragmentation caused by huge pages.
-	 */
-	addr = hugetlb_get_unmapped_area_existing(len);
-	if (addr)
-		return addr;
-
-	/*
-	 * Find an unmapped naturally aligned set of 4MB blocks that we can use
-	 * for huge pages.
-	 */
-	return hugetlb_get_unmapped_area_new_pmd(len);
-}
-
-#endif /*HAVE_ARCH_HUGETLB_UNMAPPED_AREA*/
-
-/* necessary for boot time 4MB huge page allocation */
-static __init int setup_hugepagesz(char *opt)
-{
-	unsigned long ps = memparse(opt, &opt);
-	if (ps == (1 << HPAGE_SHIFT)) {
-		hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT);
-	} else {
-		hugetlb_bad_size();
-		pr_err("hugepagesz: Unsupported page size %lu M\n",
-		       ps >> 20);
-		return 0;
-	}
-	return 1;
-}
-__setup("hugepagesz=", setup_hugepagesz);