alpha: implement the new page table range API

Add PFN_PTE_SHIFT, update_mmu_cache_range() and flush_icache_pages().

Link: https://lkml.kernel.org/r/20230802151406.3735276-8-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Mike Rapoport (IBM) <rppt@kernel.org>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/alpha/include/asm/cacheflush.h

@@ -57,6 +57,16 @@ extern void flush_icache_user_page(struct vm_area_struct *vma,
 #define flush_icache_page(vma, page) \
 	flush_icache_user_page((vma), (page), 0, 0)
 
+/*
+ * Both implementations of flush_icache_user_page flush the entire
+ * address space, so one call, no matter how many pages.
+ */
+static inline void flush_icache_pages(struct vm_area_struct *vma,
+		struct page *page, unsigned int nr)
+{
+	flush_icache_user_page(vma, page, 0, 0);
+}
+
 #include <asm-generic/cacheflush.h>
 
 #endif /* _ALPHA_CACHEFLUSH_H */

arch/alpha/include/asm/pgtable.h

@@ -26,7 +26,6 @@ struct vm_area_struct;
  * hook is made available.
  */
 #define set_pte(pteptr, pteval) ((*(pteptr)) = (pteval))
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 
 /* PMD_SHIFT determines the size of the area a second-level page table can map */
 #define PMD_SHIFT	(PAGE_SHIFT + (PAGE_SHIFT-3))
@@ -189,7 +188,8 @@ extern unsigned long __zero_page(void);
  * and a page entry and page directory to the page they refer to.
  */
 #define page_to_pa(page)	(page_to_pfn(page) << PAGE_SHIFT)
-#define pte_pfn(pte)	(pte_val(pte) >> 32)
+#define PFN_PTE_SHIFT		32
+#define pte_pfn(pte)		(pte_val(pte) >> PFN_PTE_SHIFT)
 
 #define pte_page(pte)	pfn_to_page(pte_pfn(pte))
 #define mk_pte(page, pgprot)						\
@@ -303,6 +303,12 @@ extern inline void update_mmu_cache(struct vm_area_struct * vma,
 {
 }
 
+static inline void update_mmu_cache_range(struct vm_fault *vmf,
+		struct vm_area_struct *vma, unsigned long address,
+		pte_t *ptep, unsigned int nr)
+{
+}
+
 /*
  * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that
  * are !pte_none() && !pte_present().