Re: [PATCH repost 12/16] parisc/uaccess: fix sparse errors

From: Helge Deller
Date: Thu Dec 25 2014 - 17:38:05 EST

Hi Michael,

On 12/25/2014 10:29 AM, Michael S. Tsirkin wrote:
virtio wants to read bitwise types from userspace using get_user. At the

I don't know the virtio code much yet, but does it makes sense to read bitwise types?
Will virtio then get possible troubles because of endianess correct as well?

Do you have a code example, or the sparse error message ?


moment this triggers sparse errors, since the value is passed through an

Fix that up using __force.

Signed-off-by: Michael S. Tsirkin <mst@xxxxxxxxxx>
arch/parisc/include/asm/uaccess.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/parisc/include/asm/uaccess.h b/arch/parisc/include/asm/uaccess.h
index a5cb070..3a20da6 100644
--- a/arch/parisc/include/asm/uaccess.h
+++ b/arch/parisc/include/asm/uaccess.h
@@ -104,7 +104,7 @@ struct exception_data {
} \
} \
- (x) = (__typeof__(*(ptr))) __gu_val; \
+ (x) = (__force __typeof__(*(ptr))) __gu_val; \
__gu_err; \

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