linux-kernel - [PATCH] csky: fix syscache.c fallthrough warning

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Date:   Sun, 11 Apr 2021 09:41:04 -0700
From:   Randy Dunlap <rdunlap@...radead.org>
To:     linux-kernel@...r.kernel.org
Cc:     Randy Dunlap <rdunlap@...radead.org>, Guo Ren <guoren@...nel.org>,
        linux-csky@...r.kernel.org, Arnd Bergmann <arnd@...db.de>
Subject: [PATCH] csky: fix syscache.c fallthrough warning

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@...radead.org>
Cc: Guo Ren <guoren@...nel.org>
Cc: linux-csky@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
---
@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);