linux-kernel - [PATCH 16/18] sparc/uaccess: fix sparse errors

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Date:	Sun, 14 Dec 2014 18:53:04 +0200
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	Arnd Bergmann <arnd@...db.de>, linux-arch@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Sam Ravnborg <sam@...nborg.org>,
	Dave Kleikamp <dave.kleikamp@...cle.com>,
	sparclinux@...r.kernel.org
Subject: [PATCH 16/18] sparc/uaccess: fix sparse errors

virtio wants to read bitwise types from userspace using get_user.  At the
moment this triggers sparse errors, since the value is passed through an
integer.

Fix that up using __force.

Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
---
 arch/sparc/include/asm/uaccess_64.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h
index c990a5e..b80866d 100644
--- a/arch/sparc/include/asm/uaccess_64.h
+++ b/arch/sparc/include/asm/uaccess_64.h
@@ -145,7 +145,7 @@ case 2: __get_user_asm(__gu_val,uh,addr,__gu_ret); break; \
 case 4: __get_user_asm(__gu_val,uw,addr,__gu_ret); break; \
 case 8: __get_user_asm(__gu_val,x,addr,__gu_ret); break; \
 default: __gu_val = 0; __gu_ret = __get_user_bad(); break; \
-} data = (type) __gu_val; __gu_ret; })
+} data = (__force type) __gu_val; __gu_ret; })
 
 #define __get_user_nocheck_ret(data,addr,size,type,retval) ({ \
 register unsigned long __gu_val __asm__ ("l1"); \
@@ -155,7 +155,7 @@ case 2: __get_user_asm_ret(__gu_val,uh,addr,retval); break; \
 case 4: __get_user_asm_ret(__gu_val,uw,addr,retval); break; \
 case 8: __get_user_asm_ret(__gu_val,x,addr,retval); break; \
 default: if (__get_user_bad()) return retval; \
-} data = (type) __gu_val; })
+} data = (__force type) __gu_val; })
 
 #define __get_user_asm(x,size,addr,ret)					\
 __asm__ __volatile__(							\
-- 
MST

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