[PATCH] csky: fix syscache.c fallthrough warning

[Randy Dunlap <rdunlap@xxxxxxxxxxxxx>]

This case of the switch statement falls through to the following case.
This appears to be on purpose, so declare it as OK.

../arch/csky/mm/syscache.c: In function '__do_sys_cacheflush':
../arch/csky/mm/syscache.c:17:3: warning: this statement may fall through [-Wimplicit-fallthrough=]
   17 |   flush_icache_mm_range(current->mm,
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   18 |     (unsigned long)addr,
      |     ~~~~~~~~~~~~~~~~~~~~
   19 |     (unsigned long)addr + bytes);
      |     ~~~~~~~~~~~~~~~~~~~~~~~~~~~~
../arch/csky/mm/syscache.c:20:2: note: here
   20 |  case DCACHE:
      |  ^~~~

Fixes: 997153b9a75c ("csky: Add flush_icache_mm to defer flush icache all")
Signed-off-by: Randy Dunlap <rdunlap@xxxxxxxxxxxxx>
Cc: Guo Ren <guoren@xxxxxxxxxx>
Cc: linux-csky@xxxxxxxxxxxxxxx
Cc: Arnd Bergmann <arnd@xxxxxxxx>
---
@Guo, should this be a "break" instead of fallthrough?

 arch/csky/mm/syscache.c |    1 +
 1 file changed, 1 insertion(+)

--- linux-next-20210409.orig/arch/csky/mm/syscache.c
+++ linux-next-20210409/arch/csky/mm/syscache.c
@@ -17,6 +17,7 @@ SYSCALL_DEFINE3(cacheflush,
 		flush_icache_mm_range(current->mm,
 				(unsigned long)addr,
 				(unsigned long)addr + bytes);
+		fallthrough;
 	case DCACHE:
 		dcache_wb_range((unsigned long)addr,
 				(unsigned long)addr + bytes);