Merge branch 'topic/user-access-begin' into next

Merge the user_access_begin() series from Christophe. This is based on
a commit from Linus that went into v5.5-rc7.

1 files changed, 32 insertions, 1 deletions

diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
index a950a22c4890..cac7404b2bdd 100644
--- a/include/asm-generic/cacheflush.h
+++ b/include/asm-generic/cacheflush.h
@@ -11,71 +11,102 @@
  * The cache doesn't need to be flushed when TLB entries change when
  * the cache is mapped to physical memory, not virtual memory
  */
+#ifndef flush_cache_all
 static inline void flush_cache_all(void)
 {
 }
+#endif
 
+#ifndef flush_cache_mm
 static inline void flush_cache_mm(struct mm_struct *mm)
 {
 }
+#endif
 
+#ifndef flush_cache_dup_mm
 static inline void flush_cache_dup_mm(struct mm_struct *mm)
 {
 }
+#endif
 
+#ifndef flush_cache_range
 static inline void flush_cache_range(struct vm_area_struct *vma,
 				     unsigned long start,
 				     unsigned long end)
 {
 }
+#endif
 
+#ifndef flush_cache_page
 static inline void flush_cache_page(struct vm_area_struct *vma,
 				    unsigned long vmaddr,
 				    unsigned long pfn)
 {
 }
+#endif
 
+#ifndef flush_dcache_page
 static inline void flush_dcache_page(struct page *page)
 {
 }
+#endif
 
+#ifndef flush_dcache_mmap_lock
 static inline void flush_dcache_mmap_lock(struct address_space *mapping)
 {
 }
+#endif
 
+#ifndef flush_dcache_mmap_unlock
 static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
 {
 }
+#endif
 
+#ifndef flush_icache_range
 static inline void flush_icache_range(unsigned long start, unsigned long end)
 {
 }
+#endif
 
+#ifndef flush_icache_page
 static inline void flush_icache_page(struct vm_area_struct *vma,
 				     struct page *page)
 {
 }
+#endif
 
+#ifndef flush_icache_user_range
 static inline void flush_icache_user_range(struct vm_area_struct *vma,
 					   struct page *page,
 					   unsigned long addr, int len)
 {
 }
+#endif
 
+#ifndef flush_cache_vmap
 static inline void flush_cache_vmap(unsigned long start, unsigned long end)
 {
 }
+#endif
 
+#ifndef flush_cache_vunmap
 static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
 {
 }
+#endif
 
-#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
+#ifndef copy_to_user_page
+#define copy_to_user_page(vma, page, vaddr, dst, src, len)	\
 	do { \
 		memcpy(dst, src, len); \
 		flush_icache_user_range(vma, page, vaddr, len); \
 	} while (0)
+#endif
+
+#ifndef copy_from_user_page
 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
 	memcpy(dst, src, len)
+#endif
 
 #endif /* __ASM_CACHEFLUSH_H */