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2023-12-11 1f93a7dfd1f8d5ff7a5c53246c7534fe2332d6f4

 kernel/arch/mips/mm/highmem.c
..
..
@@ -8,123 +8,10 @@
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 #include <asm/fixmap.h>
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 #include <asm/tlbflush.h>
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-static pte_t *kmap_pte;
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-
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 unsigned long highstart_pfn, highend_pfn;
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-void *kmap(struct page *page)
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+void kmap_flush_tlb(unsigned long addr)
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 {
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-	void *addr;
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-
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-	might_sleep();
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-	if (!PageHighMem(page))
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-		return page_address(page);
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-	addr = kmap_high(page);
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-	flush_tlb_one((unsigned long)addr);
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-
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-	return addr;
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+	flush_tlb_one(addr);
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 }
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-EXPORT_SYMBOL(kmap);
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-
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-void kunmap(struct page *page)
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-{
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-	BUG_ON(in_interrupt());
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-	if (!PageHighMem(page))
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-		return;
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-	kunmap_high(page);
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-}
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-EXPORT_SYMBOL(kunmap);
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-
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-/*
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- * kmap_atomic/kunmap_atomic is significantly faster than kmap/kunmap because
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- * no global lock is needed and because the kmap code must perform a global TLB
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- * invalidation when the kmap pool wraps.
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- *
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- * However when holding an atomic kmap is is not legal to sleep, so atomic
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- * kmaps are appropriate for short, tight code paths only.
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- */
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-
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-void *kmap_atomic(struct page *page)
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-{
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-	unsigned long vaddr;
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-	int idx, type;
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-
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-	preempt_disable();
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-	pagefault_disable();
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-	if (!PageHighMem(page))
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-		return page_address(page);
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-
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-	type = kmap_atomic_idx_push();
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-	idx = type + KM_TYPE_NR*smp_processor_id();
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-	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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-#ifdef CONFIG_DEBUG_HIGHMEM
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-	BUG_ON(!pte_none(*(kmap_pte - idx)));
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-#endif
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-	set_pte(kmap_pte-idx, mk_pte(page, PAGE_KERNEL));
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-	local_flush_tlb_one((unsigned long)vaddr);
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-
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-	return (void*) vaddr;
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-}
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-EXPORT_SYMBOL(kmap_atomic);
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-
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-void __kunmap_atomic(void *kvaddr)
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-{
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-	unsigned long vaddr = (unsigned long) kvaddr & PAGE_MASK;
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-	int type __maybe_unused;
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-
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-	if (vaddr < FIXADDR_START) { // FIXME
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-		pagefault_enable();
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-		preempt_enable();
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-		return;
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-	}
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-
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-	type = kmap_atomic_idx();
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-#ifdef CONFIG_DEBUG_HIGHMEM
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-	{
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-		int idx = type + KM_TYPE_NR * smp_processor_id();
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-
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-		BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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-
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-		/*
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-		 * force other mappings to Oops if they'll try to access
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-		 * this pte without first remap it
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-		 */
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-		pte_clear(&init_mm, vaddr, kmap_pte-idx);
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-		local_flush_tlb_one(vaddr);
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-	}
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-#endif
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-	kmap_atomic_idx_pop();
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-	pagefault_enable();
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-	preempt_enable();
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-}
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-EXPORT_SYMBOL(__kunmap_atomic);
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-
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-/*
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- * This is the same as kmap_atomic() but can map memory that doesn't
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- * have a struct page associated with it.
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- */
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-void *kmap_atomic_pfn(unsigned long pfn)
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-{
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-	unsigned long vaddr;
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-	int idx, type;
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-
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-	preempt_disable();
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-	pagefault_disable();
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-
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-	type = kmap_atomic_idx_push();
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-	idx = type + KM_TYPE_NR*smp_processor_id();
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-	vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx);
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-	set_pte(kmap_pte-idx, pfn_pte(pfn, PAGE_KERNEL));
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-	flush_tlb_one(vaddr);
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-
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-	return (void*) vaddr;
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-}
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-
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-void __init kmap_init(void)
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-{
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-	unsigned long kmap_vstart;
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-
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-	/* cache the first kmap pte */
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-	kmap_vstart = __fix_to_virt(FIX_KMAP_BEGIN);
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-	kmap_pte = kmap_get_fixmap_pte(kmap_vstart);
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-}
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+EXPORT_SYMBOL(kmap_flush_tlb);