asm-generic: remove unused asm-generic/page.h

This file was used by c6x and blackfin in the past, but no architecture uses
it any more, and it is only useful for architectures that do not support
an MMU in the first place.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

include/asm-generic/page.h

-/* SPDX-License-Identifier: GPL-2.0 */
-#ifndef __ASM_GENERIC_PAGE_H
-#define __ASM_GENERIC_PAGE_H
-/*
- * Generic page.h implementation, for NOMMU architectures.
- * This provides the dummy definitions for the memory management.
- */
-
-#ifdef CONFIG_MMU
-#error need to provide a real asm/page.h
-#endif
-
-
-/* PAGE_SHIFT determines the page size */
-
-#define PAGE_SHIFT	12
-#ifdef __ASSEMBLY__
-#define PAGE_SIZE	(1 << PAGE_SHIFT)
-#else
-#define PAGE_SIZE	(1UL << PAGE_SHIFT)
-#endif
-#define PAGE_MASK	(~(PAGE_SIZE-1))
-
-#include <asm/setup.h>
-
-#ifndef __ASSEMBLY__
-
-#define clear_page(page)	memset((page), 0, PAGE_SIZE)
-#define copy_page(to,from)	memcpy((to), (from), PAGE_SIZE)
-
-#define clear_user_page(page, vaddr, pg)	clear_page(page)
-#define copy_user_page(to, from, vaddr, pg)	copy_page(to, from)
-
-/*
- * These are used to make use of C type-checking..
- */
-typedef struct {
-	unsigned long pte;
-} pte_t;
-typedef struct {
-	unsigned long pmd[16];
-} pmd_t;
-typedef struct {
-	unsigned long pgd;
-} pgd_t;
-typedef struct {
-	unsigned long pgprot;
-} pgprot_t;
-typedef struct page *pgtable_t;
-
-#define pte_val(x)	((x).pte)
-#define pmd_val(x)	((&x)->pmd[0])
-#define pgd_val(x)	((x).pgd)
-#define pgprot_val(x)	((x).pgprot)
-
-#define __pte(x)	((pte_t) { (x) } )
-#define __pmd(x)	((pmd_t) { (x) } )
-#define __pgd(x)	((pgd_t) { (x) } )
-#define __pgprot(x)	((pgprot_t) { (x) } )
-
-extern unsigned long memory_start;
-extern unsigned long memory_end;
-
-#endif /* !__ASSEMBLY__ */
-
-#define PAGE_OFFSET		(0)
-
-#ifndef ARCH_PFN_OFFSET
-#define ARCH_PFN_OFFSET		(PAGE_OFFSET >> PAGE_SHIFT)
-#endif
-
-#ifndef __ASSEMBLY__
-
-#define __va(x) ((void *)((unsigned long) (x)))
-#define __pa(x) ((unsigned long) (x))
-
-static inline unsigned long virt_to_pfn(const void *kaddr)
-{
-	return __pa(kaddr) >> PAGE_SHIFT;
-}
-#define virt_to_pfn virt_to_pfn
-static inline void *pfn_to_virt(unsigned long pfn)
-{
-	return __va(pfn) << PAGE_SHIFT;
-}
-#define pfn_to_virt pfn_to_virt
-
-#define virt_to_page(addr)	pfn_to_page(virt_to_pfn(addr))
-#define page_to_virt(page)	pfn_to_virt(page_to_pfn(page))
-
-#ifndef page_to_phys
-#define page_to_phys(page)      ((dma_addr_t)page_to_pfn(page) << PAGE_SHIFT)
-#endif
-
-#define	virt_addr_valid(kaddr)	(((void *)(kaddr) >= (void *)PAGE_OFFSET) && \
-				((void *)(kaddr) < (void *)memory_end))
-
-#endif /* __ASSEMBLY__ */
-
-#include <asm-generic/memory_model.h>
-#include <asm-generic/getorder.h>
-
-#endif /* __ASM_GENERIC_PAGE_H */