asm-generic/cacheflush.h: flush icache when copying to user pages

The copy_to_user_page() function is supposed to flush the icache on the
memory that was written, but the current asm-generic version lacks that
logic.  While normally it isn't a big deal as the asm-generic version of
icache flushing is a stub, it is a deal for ports that want to use the
asm-generic version as a baseline and then overlay its own specific parts
(like icache flushing).

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
index 57b5c3c82e86a8e2e7b875e49dc1641ca20fb7aa..87bc536ccde3cedb139a892e692e83ee45a12cfe 100644 (file)
--- a/include/asm-generic/cacheflush.h
+++ b/include/asm-generic/cacheflush.h
@@ -24,7 +24,10 @@
 #define flush_cache_vunmap(start, end)         do { } while (0)
 
 #define copy_to_user_page(vma, page, vaddr, dst, src, len) \
-       memcpy(dst, src, len)
+       do { \
+               memcpy(dst, src, len); \
+               flush_icache_user_range(vma, page, vaddr, len); \
+       } while (0)
 #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
        memcpy(dst, src, len)