metag: Remove arch/metag/

[sfrench/cifs-2.6.git] / arch / metag / mm / highmem.c

diff --git a/arch/metag/mm/highmem.c b/arch/metag/mm/highmem.c
deleted file mode 100644 (file)
index 83527fc..0000000
--- a/arch/metag/mm/highmem.c
+++ /dev/null
@@ -1,122 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/export.h>
-#include <linux/highmem.h>
-#include <linux/sched.h>
-#include <linux/smp.h>
-#include <linux/interrupt.h>
-#include <asm/fixmap.h>
-#include <asm/tlbflush.h>
-
-static pte_t *kmap_pte;
-
-unsigned long highstart_pfn, highend_pfn;
-
-void *kmap(struct page *page)
-{
-       might_sleep();
-       if (!PageHighMem(page))
-               return page_address(page);
-       return kmap_high(page);
-}
-EXPORT_SYMBOL(kmap);
-
-void kunmap(struct page *page)
-{
-       BUG_ON(in_interrupt());
-       if (!PageHighMem(page))
-               return;
-       kunmap_high(page);
-}
-EXPORT_SYMBOL(kunmap);
-
-/*
- * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because
- * no global lock is needed and because the kmap code must perform a global TLB
- * invalidation when the kmap pool wraps.
- *
- * However when holding an atomic kmap is is not legal to sleep, so atomic
- * kmaps are appropriate for short, tight code paths only.
- */
-
-void *kmap_atomic(struct page *page)
-{
-       enum fixed_addresses idx;
-       unsigned long vaddr;
-       int type;
-
-       preempt_disable();
-       pagefault_disable();
-       if (!PageHighMem(page))
-               return page_address(page);
-
-       type = kmap_atomic_idx_push();
-       idx = type + KM_TYPE_NR * smp_processor_id();
-       vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-#ifdef CONFIG_DEBUG_HIGHMEM
-       BUG_ON(!pte_none(*(kmap_pte - idx)));
-#endif
-       set_pte(kmap_pte - idx, mk_pte(page, PAGE_KERNEL));
-
-       return (void *)vaddr;
-}
-EXPORT_SYMBOL(kmap_atomic);
-
-void __kunmap_atomic(void *kvaddr)
-{
-       unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
-       int idx, type;
-
-       if (kvaddr >= (void *)FIXADDR_START) {
-               type = kmap_atomic_idx();
-               idx = type + KM_TYPE_NR * smp_processor_id();
-
-               /*
-                * Force other mappings to Oops if they'll try to access this
-                * pte without first remap it.  Keeping stale mappings around
-                * is a bad idea also, in case the page changes cacheability
-                * attributes or becomes a protected page in a hypervisor.
-                */
-               pte_clear(&init_mm, vaddr, kmap_pte-idx);
-               flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
-
-               kmap_atomic_idx_pop();
-       }
-
-       pagefault_enable();
-       preempt_enable();
-}
-EXPORT_SYMBOL(__kunmap_atomic);
-
-/*
- * This is the same as kmap_atomic() but can map memory that doesn't
- * have a struct page associated with it.
- */
-void *kmap_atomic_pfn(unsigned long pfn)
-{
-       enum fixed_addresses idx;
-       unsigned long vaddr;
-       int type;
-
-       preempt_disable();
-       pagefault_disable();
-
-       type = kmap_atomic_idx_push();
-       idx = type + KM_TYPE_NR * smp_processor_id();
-       vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
-#ifdef CONFIG_DEBUG_HIGHMEM
-       BUG_ON(!pte_none(*(kmap_pte - idx)));
-#endif
-       set_pte(kmap_pte - idx, pfn_pte(pfn, PAGE_KERNEL));
-       flush_tlb_kernel_range(vaddr, vaddr + PAGE_SIZE);
-
-       return (void *)vaddr;
-}
-
-void __init kmap_init(void)
-{
-       unsigned long kmap_vstart;
-
-       /* cache the first kmap pte */
-       kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
-       kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
-}