Subject: [PATCH AUTOSEL 4.4 48/80] powerpc/uaccess: fix warning/error with access_ok()

From: Sasha Levin <[email-masked]>
Date: Mon, 28 Jan 2019 11:23:29 -0500

From: Christophe Leroy <[email-masked]>

[ Upstream commit 05a4ab823983d9136a460b7b5e0d49ee709a6f86 ]

With the following piece of code, the following compilation warning
is encountered:

	if (_IOC_DIR(ioc) != _IOC_NONE) {
		int verify = _IOC_DIR(ioc) & _IOC_READ ? VERIFY_WRITE : VERIFY_READ;

		if (!access_ok(verify, ioarg, _IOC_SIZE(ioc))) {

drivers/platform/test/dev.c: In function 'my_ioctl':
drivers/platform/test/dev.c:219:7: warning: unused variable 'verify' [-Wunused-variable]
   int verify = _IOC_DIR(ioc) & _IOC_READ ? VERIFY_WRITE : VERIFY_READ;

This patch fixes it by referencing 'type' in the macro allthough
doing nothing with it.

Signed-off-by: Christophe Leroy <[email-masked]>
Signed-off-by: Michael Ellerman <[email-masked]>
Signed-off-by: Sasha Levin <[email-masked]>
---
 arch/powerpc/include/asm/uaccess.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index a5ffe0207c16..05f1389228d2 100644
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -59,7 +59,7 @@
 #endif
 
 #define access_ok(type, addr, size)		\
-	(__chk_user_ptr(addr),			\
+	(__chk_user_ptr(addr), (void)(type),		\
 	 __access_ok((__force unsigned long)(addr), (size), get_fs()))
 
 /*
-- 
2.19.1