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2024-05-10 10ebd8556b7990499c896a550e3d416b444211e6

 kernel/arch/powerpc/mm/highmem.c
..
..
@@ -24,54 +24,35 @@
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 #include <linux/highmem.h>
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 #include <linux/module.h>
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-/*
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- * The use of kmap_atomic/kunmap_atomic is discouraged - kmap/kunmap
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- * gives a more generic (and caching) interface. But kmap_atomic can
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- * be used in IRQ contexts, so in some (very limited) cases we need
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- * it.
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- */
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-void *kmap_atomic_prot(struct page *page, pgprot_t prot)
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+void *kmap_atomic_high_prot(struct page *page, pgprot_t prot)
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 {
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 	unsigned long vaddr;
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 	int idx, type;
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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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+	WARN_ON(IS_ENABLED(CONFIG_DEBUG_HIGHMEM) && !pte_none(*(kmap_pte - idx)));
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 	__set_pte_at(&init_mm, vaddr, kmap_pte-idx, mk_pte(page, prot), 1);
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 	local_flush_tlb_page(NULL, vaddr);
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 	return (void*) vaddr;
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 }
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-EXPORT_SYMBOL(kmap_atomic_prot);
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+EXPORT_SYMBOL(kmap_atomic_high_prot);
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-void __kunmap_atomic(void *kvaddr)
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+void kunmap_atomic_high(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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-	if (vaddr < __fix_to_virt(FIX_KMAP_END)) {
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-		pagefault_enable();
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-		preempt_enable();
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+	if (vaddr < __fix_to_virt(FIX_KMAP_END))
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 		return;
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-	}
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-	type = kmap_atomic_idx();
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-
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-#ifdef CONFIG_DEBUG_HIGHMEM
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-	{
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+	if (IS_ENABLED(CONFIG_DEBUG_HIGHMEM)) {
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+		int type = kmap_atomic_idx();
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 		unsigned int idx;
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 		idx = type + KM_TYPE_NR * smp_processor_id();
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-		BUG_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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+		WARN_ON(vaddr != __fix_to_virt(FIX_KMAP_BEGIN + idx));
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 		/*
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 		 * force other mappings to Oops if they'll try to access
..
..
@@ -80,10 +61,7 @@
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 		pte_clear(&init_mm, vaddr, kmap_pte-idx);
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 		local_flush_tlb_page(NULL, 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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+EXPORT_SYMBOL(kunmap_atomic_high);