add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/powerpc/include/asm/highmem.h
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@@ -30,7 +30,6 @@
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 #include <asm/fixmap.h>
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 extern pte_t *kmap_pte;
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-extern pgprot_t kmap_prot;
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 extern pte_t *pkmap_page_table;
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 /*
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@@ -58,33 +57,6 @@
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 #define LAST_PKMAP_MASK	(LAST_PKMAP-1)
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 #define PKMAP_NR(virt)  ((virt-PKMAP_BASE) >> PAGE_SHIFT)
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 #define PKMAP_ADDR(nr)  (PKMAP_BASE + ((nr) << PAGE_SHIFT))
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-
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-extern void *kmap_high(struct page *page);
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-extern void kunmap_high(struct page *page);
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-extern void *kmap_atomic_prot(struct page *page, pgprot_t prot);
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-extern void __kunmap_atomic(void *kvaddr);
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-
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-static inline void *kmap(struct page *page)
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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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-	return kmap_high(page);
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-}
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-
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-static inline 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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-
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-static inline void *kmap_atomic(struct page *page)
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-{
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-	return kmap_atomic_prot(page, kmap_prot);
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-}
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-
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 #define flush_cache_kmaps()	flush_cache_all()
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