[PATCH v2 03/40] arm64/uaccess: fix sparse errors

On Tue, Jan 06, 2015 at 11:48:20PM +0200, Michael S. Tsirkin wrote:

On Tue, Jan 06, 2015 at 07:14:32PM +0000, Will Deacon wrote:

quoted

Hi Michael,

On Tue, Jan 06, 2015 at 03:43:40PM +0000, Michael S. Tsirkin wrote:

quoted

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@redhat.com>

Acked-by: Will Deacon <redacted>
---

Did you want us to take this via the arm64 tree, or are you planning to
merge it via another route?

Will

Up to you really: if you don't pick it up, Arnd said he'll merge
through his tree.

Though if you do pick it up, need to also pick up the follow-up
patch - maybe my tree is easier.

quoted

quoted

 arch/arm64/include/asm/uaccess.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/include/asm/uaccess.h b/arch/arm64/include/asm/uaccess.h
index 3bf8f4e..9a2069b 100644
--- a/arch/arm64/include/asm/uaccess.h
+++ b/arch/arm64/include/asm/uaccess.h

@@ -147,7 +147,7 @@ do {									\
 	default:							\
 		BUILD_BUG();						\
 	}								\
-	(x) = (__typeof__(*(ptr)))__gu_val;				\
+	(x) = (__force __typeof__(*(ptr)))__gu_val;			\
 } while (0)
 
 #define __get_user(x, ptr)						\

-- 
MST