ia64: fix put_user sparse errors

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 callers
do a cast (__typeof__(*(ptr))) (x) which in turn forces all the
necessary type checks.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>

diff --git a/arch/ia64/include/asm/uaccess.h b/arch/ia64/include/asm/uaccess.h
index 967c312..4f3fb6c 100644 (file)
--- a/arch/ia64/include/asm/uaccess.h
+++ b/arch/ia64/include/asm/uaccess.h
@@ -169,10 +169,11 @@ do {                                                                      \
        (err) = ia64_getreg(_IA64_REG_R8);                              \
        (val) = ia64_getreg(_IA64_REG_R9);                              \
 } while (0)
-# define __put_user_size(val, addr, n, err)                                                    \
-do {                                                                                           \
-       __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE, (unsigned long) (val));    \
-       (err) = ia64_getreg(_IA64_REG_R8);                                                      \
+# define __put_user_size(val, addr, n, err)                            \
+do {                                                                   \
+       __st_user("__ex_table", (unsigned long) addr, n, RELOC_TYPE,    \
+                 (__force unsigned long) (val));                       \
+       (err) = ia64_getreg(_IA64_REG_R8);                              \
 } while (0)
 #endif /* !ASM_SUPPORTED */