linux-kernel - [PATCH 5.10 578/593] csky: fix syscache.c fallthrough warning

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Date:   Mon, 12 Jul 2021 08:12:18 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Randy Dunlap <rdunlap@...radead.org>,
        Guo Ren <guoren@...nel.org>, linux-csky@...r.kernel.org,
        Arnd Bergmann <arnd@...db.de>, Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.10 578/593] csky: fix syscache.c fallthrough warning

From: Randy Dunlap <rdunlap@...radead.org>

[ Upstream commit 0679d29d3e2351a1c3049c26a63ce1959cad5447 ]

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>
Signed-off-by: Guo Ren <guoren@...nel.org>
Cc: linux-csky@...r.kernel.org
Cc: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/csky/mm/syscache.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/csky/mm/syscache.c b/arch/csky/mm/syscache.c
index ffade2f9a4c8..4e51d63850c4 100644
--- a/arch/csky/mm/syscache.c
+++ b/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);
-- 
2.30.2