mm: rationalise flush_icache_pages() and flush_icache_page()

Move the default (no-op) implementation of flush_icache_pages() to
<linux/cacheflush.h> from <asm-generic/cacheflush.h>.  Remove the
flush_icache_page() wrapper from each architecture into
<linux/cacheflush.h>.

Link: https://lkml.kernel.org/r/20230802151406.3735276-32-willy@infradead.orgSigned-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

arch/alpha/include/asm/cacheflush.h

@@ -53,10 +53,6 @@ extern void flush_icache_user_page(struct vm_area_struct *vma,
 #define flush_icache_user_page flush_icache_user_page
 #endif /* CONFIG_SMP */
 
-/* This is used only in __do_fault and do_swap_page.  */
-#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.
@@ -66,6 +62,7 @@ static inline void flush_icache_pages(struct vm_area_struct *vma,
 {
 	flush_icache_user_page(vma, page, 0, 0);
 }
+#define flush_icache_pages flush_icache_pages
 
 #include <asm-generic/cacheflush.h>
 

arch/arc/include/asm/cacheflush.h

@@ -18,15 +18,6 @@
 #include <linux/mm.h>
 #include <asm/shmparam.h>
 
-/*
- * Semantically we need this because icache doesn't snoop dcache/dma.
- * However ARC Cache flush requires paddr as well as vaddr, latter not available
- * in the flush_icache_page() API. So we no-op it but do the equivalent work
- * in update_mmu_cache()
- */
-#define flush_icache_page(vma, page)
-#define flush_icache_pages(vma, page, nr)
-
 void flush_cache_all(void);
 
 void flush_icache_range(unsigned long kstart, unsigned long kend);

arch/arm/include/asm/cacheflush.h

@@ -321,13 +321,6 @@ static inline void flush_anon_page(struct vm_area_struct *vma,
 #define flush_dcache_mmap_lock(mapping)		xa_lock_irq(&mapping->i_pages)
 #define flush_dcache_mmap_unlock(mapping)	xa_unlock_irq(&mapping->i_pages)
 
-/*
- * We don't appear to need to do anything here.  In fact, if we did, we'd
- * duplicate cache flushing elsewhere performed by flush_dcache_page().
- */
-#define flush_icache_page(vma,page)	do { } while (0)
-#define flush_icache_pages(vma, page, nr)	do { } while (0)
-
 /*
  * flush_cache_vmap() is used when creating mappings (eg, via vmap,
  * vmalloc, ioremap etc) in kernel space for pages.  On non-VIPT

arch/csky/abiv1/inc/abi/cacheflush.h

@@ -45,7 +45,6 @@ extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, u
 #define flush_cache_vmap(start, end)		cache_wbinv_all()
 #define flush_cache_vunmap(start, end)		cache_wbinv_all()
 
-#define flush_icache_page(vma, page)		do {} while (0);
 #define flush_icache_range(start, end)		cache_wbinv_range(start, end)
 #define flush_icache_mm_range(mm, start, end)	cache_wbinv_range(start, end)
 #define flush_icache_deferred(mm)		do {} while (0);

arch/csky/abiv2/inc/abi/cacheflush.h

@@ -33,7 +33,6 @@ static inline void flush_dcache_page(struct page *page)
 
 #define flush_dcache_mmap_lock(mapping)		do { } while (0)
 #define flush_dcache_mmap_unlock(mapping)	do { } while (0)
-#define flush_icache_page(vma, page)		do { } while (0)
 
 #define flush_icache_range(start, end)		cache_wbinv_range(start, end)
 

arch/hexagon/include/asm/cacheflush.h

@@ -18,7 +18,7 @@
  *  - flush_cache_range(vma, start, end) flushes a range of pages
  *  - flush_icache_range(start, end) flush a range of instructions
  *  - flush_dcache_page(pg) flushes(wback&invalidates) a page for dcache
- *  - flush_icache_page(vma, pg) flushes(invalidates) a page for icache
+ *  - flush_icache_pages(vma, pg, nr) flushes(invalidates) nr pages for icache
  *
  *  Need to doublecheck which one is really needed for ptrace stuff to work.
  */

arch/loongarch/include/asm/cacheflush.h

@@ -46,8 +46,6 @@ void local_flush_icache_range(unsigned long start, unsigned long end);
 #define flush_cache_page(vma, vmaddr, pfn)		do { } while (0)
 #define flush_cache_vmap(start, end)			do { } while (0)
 #define flush_cache_vunmap(start, end)			do { } while (0)
-#define flush_icache_page(vma, page)			do { } while (0)
-#define flush_icache_pages(vma, page)			do { } while (0)
 #define flush_icache_user_page(vma, page, addr, len)	do { } while (0)
 #define flush_dcache_page(page)				do { } while (0)
 #define flush_dcache_mmap_lock(mapping)			do { } while (0)

arch/m68k/include/asm/cacheflush_mm.h

@@ -261,7 +261,6 @@ static inline void __flush_pages_to_ram(void *vaddr, unsigned int nr)
 #define flush_dcache_mmap_unlock(mapping)	do { } while (0)
 #define flush_icache_pages(vma, page, nr)	\
 	__flush_pages_to_ram(page_address(page), nr)
-#define flush_icache_page(vma, page) flush_icache_pages(vma, page, 1)
 
 extern void flush_icache_user_page(struct vm_area_struct *vma, struct page *page,
 				    unsigned long addr, int len);

arch/mips/include/asm/cacheflush.h

@@ -82,12 +82,6 @@ static inline void flush_anon_page(struct vm_area_struct *vma,
 		__flush_anon_page(page, vmaddr);
 }
 
-static inline void flush_icache_pages(struct vm_area_struct *vma,
-		struct page *page, unsigned int nr)
-{
-}
-#define flush_icache_page(vma, page) flush_icache_pages(vma, page, 1)
-
 extern void (*flush_icache_range)(unsigned long start, unsigned long end);
 extern void (*local_flush_icache_range)(unsigned long start, unsigned long end);
 extern void (*__flush_icache_user_range)(unsigned long start,

arch/nios2/include/asm/cacheflush.h

@@ -35,7 +35,7 @@ void flush_dcache_folio(struct folio *folio);
 extern void flush_icache_range(unsigned long start, unsigned long end);
 void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
 		unsigned int nr);
-#define flush_icache_page(vma, page) flush_icache_pages(vma, page, 1);
+#define flush_icache_pages flush_icache_pages
 
 #define flush_cache_vmap(start, end)		flush_dcache_range(start, end)
 #define flush_cache_vunmap(start, end)		flush_dcache_range(start, end)

arch/parisc/include/asm/cacheflush.h

@@ -60,7 +60,7 @@ static inline void flush_dcache_page(struct page *page)
 
 void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
 		unsigned int nr);
-#define flush_icache_page(vma, page)	flush_icache_pages(vma, page, 1)
+#define flush_icache_pages flush_icache_pages
 
 #define flush_icache_range(s,e)		do { 		\
 	flush_kernel_dcache_range_asm(s,e); 		\

arch/sh/include/asm/cacheflush.h

@@ -53,7 +53,7 @@ extern void flush_icache_range(unsigned long start, unsigned long end);
 #define flush_icache_user_range flush_icache_range
 void flush_icache_pages(struct vm_area_struct *vma, struct page *page,
 		unsigned int nr);
-#define flush_icache_page(vma, page) flush_icache_pages(vma, page, 1)
+#define flush_icache_pages flush_icache_pages
 extern void flush_cache_sigtramp(unsigned long address);
 
 struct flusher_data {

arch/sparc/include/asm/cacheflush_32.h

@@ -16,8 +16,6 @@
 #define flush_cache_page(vma,addr,pfn) \
 	sparc32_cachetlb_ops->cache_page(vma, addr)
 #define flush_icache_range(start, end)		do { } while (0)
-#define flush_icache_page(vma, pg)		do { } while (0)
-#define flush_icache_pages(vma, pg, nr)		do { } while (0)
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
 	do {							\

arch/sparc/include/asm/cacheflush_64.h

@@ -53,9 +53,6 @@ static inline void flush_dcache_page(struct page *page)
 	flush_dcache_folio(page_folio(page));
 }
 
-#define flush_icache_page(vma, pg)	do { } while(0)
-#define flush_icache_pages(vma, pg, nr)	do { } while(0)
-
 void flush_ptrace_access(struct vm_area_struct *, struct page *,
 			 unsigned long uaddr, void *kaddr,
 			 unsigned long len, int write);

arch/xtensa/include/asm/cacheflush.h

@@ -160,10 +160,6 @@ void local_flush_cache_page(struct vm_area_struct *vma,
 		__invalidate_icache_range(start,(end) - (start));	\
 	} while (0)
 
-/* This is not required, see Documentation/core-api/cachetlb.rst */
-#define	flush_icache_page(vma,page)			do { } while (0)
-#define	flush_icache_pages(vma, page, nr)		do { } while (0)
-
 #define flush_dcache_mmap_lock(mapping)			do { } while (0)
 #define flush_dcache_mmap_unlock(mapping)		do { } while (0)
 

include/asm-generic/cacheflush.h

@@ -77,18 +77,6 @@ static inline void flush_icache_range(unsigned long start, unsigned long end)
 #define flush_icache_user_range flush_icache_range
 #endif
 
-#ifndef flush_icache_page
-static inline void flush_icache_pages(struct vm_area_struct *vma,
-				     struct page *page, unsigned int nr)
-{
-}
-
-static inline void flush_icache_page(struct vm_area_struct *vma,
-				     struct page *page)
-{
-}
-#endif
-
 #ifndef flush_icache_user_page
 static inline void flush_icache_user_page(struct vm_area_struct *vma,
 					   struct page *page,

include/linux/cacheflush.h

@@ -17,4 +17,13 @@ static inline void flush_dcache_folio(struct folio *folio)
 #define flush_dcache_folio flush_dcache_folio
 #endif /* ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE */
 
+#ifndef flush_icache_pages
+static inline void flush_icache_pages(struct vm_area_struct *vma,
+				     struct page *page, unsigned int nr)
+{
+}
+#endif
+
+#define flush_icache_page(vma, page)	flush_icache_pages(vma, page, 1)
+
 #endif /* _LINUX_CACHEFLUSH_H */