add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/xtensa/include/asm/highmem.h
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@@ -13,10 +13,10 @@
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 #define _XTENSA_HIGHMEM_H
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 #include <linux/wait.h>
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+#include <linux/pgtable.h>
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 #include <asm/cacheflush.h>
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 #include <asm/fixmap.h>
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 #include <asm/kmap_types.h>
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-#include <asm/pgtable.h>
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 #define PKMAP_BASE		((FIXADDR_START - \
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 				  (LAST_PKMAP + 1) * PAGE_SIZE) & PMD_MASK)
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@@ -63,37 +63,10 @@
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 extern pte_t *pkmap_page_table;
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-void *kmap_high(struct page *page);
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-void kunmap_high(struct page *page);
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-
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-static inline void *kmap(struct page *page)
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-{
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-	/* Check if this memory layout is broken because PKMAP overlaps
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-	 * page table.
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-	 */
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-	BUILD_BUG_ON(PKMAP_BASE <
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-		     TLBTEMP_BASE_1 + TLBTEMP_SIZE);
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-	BUG_ON(in_interrupt());
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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 flush_cache_kmaps(void)
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 {
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 	flush_cache_all();
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 }
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-
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-void *kmap_atomic(struct page *page);
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-void __kunmap_atomic(void *kvaddr);
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 void kmap_init(void);
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