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blackfin: fix put_user sparse errors

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

For example:

	__le32 __user *p;
	__le32 x;
	put_user(x, p);

is safe, but currently triggers a sparse warning.

Fix that up using __force.

Note: this does not suppress any useful sparse checks since caller
assigns x to typeof(*p), which in turn forces all the necessary type
checks.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2015-01-06 14:37:22 +02:00
parent e8b94dea38
commit 1734bffc30
1 changed files with 4 additions and 4 deletions
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8
arch/blackfin/include/asm/uaccess.h
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@ -89,10 +89,10 @@ struct exception_table_entry {
break; \
case 8: { \
long _xl, _xh; \
_xl = ((long *)&_x)[0]; \
_xh = ((long *)&_x)[1]; \
__put_user_asm(_xl, ((long __user *)_p)+0, ); \
__put_user_asm(_xh, ((long __user *)_p)+1, ); \
_xl = ((__force long *)&_x)[0]; \
_xh = ((__force long *)&_x)[1]; \
__put_user_asm(_xl, ((__force long __user *)_p)+0, );\
__put_user_asm(_xh, ((__force long __user *)_p)+1, );\
} break; \
default: \
_err = __put_user_bad(); \