powerpc/uaccess: Allow get_user() with bitwise types

At the moment, if p and x are both of the same bitwise type
(eg. __le32), get_user(x, p) produces a sparse warning.

This is because *p is loaded into a long then cast back to typeof(*p).

When typeof(*p) is a bitwise type (which is uncommon), such a cast needs
__force, otherwise sparse produces a warning.

For non-bitwise types __force should have no effect, and should not hide
any legitimate errors.

Note that we are casting to typeof(*p) not typeof(x). Even with the
cast, if x and *p are of different types we should get the warning, so I
think we are not loosing the ability to detect any actual errors.

virtio would like to use bitwise types with get_user() so fix these
spurious warnings by adding __force.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
[mpe: Fill in changelog with more details]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

diff --git a/arch/powerpc/include/asm/uaccess.h b/arch/powerpc/include/asm/uaccess.h
index 9485b43..a0c071d 100644 (file)
--- a/arch/powerpc/include/asm/uaccess.h
+++ b/arch/powerpc/include/asm/uaccess.h
@@ -284,7 +284,7 @@ do {                                                                \
        if (!is_kernel_addr((unsigned long)__gu_addr))          \
                might_fault();                                  \
        __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
-       (x) = (__typeof__(*(ptr)))__gu_val;                     \
+       (x) = (__force __typeof__(*(ptr)))__gu_val;                     \
        __gu_err;                                               \
 })
 #endif /* __powerpc64__ */
@@ -297,7 +297,7 @@ do {                                                                \
        might_fault();                                                  \
        if (access_ok(VERIFY_READ, __gu_addr, (size)))                  \
                __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
-       (x) = (__typeof__(*(ptr)))__gu_val;                             \
+       (x) = (__force __typeof__(*(ptr)))__gu_val;                             \
        __gu_err;                                                       \
 })
 
@@ -308,7 +308,7 @@ do {                                                                \
        const __typeof__(*(ptr)) __user *__gu_addr = (ptr);     \
        __chk_user_ptr(ptr);                                    \
        __get_user_size(__gu_val, __gu_addr, (size), __gu_err); \
-       (x) = (__typeof__(*(ptr)))__gu_val;                     \
+       (x) = (__force __typeof__(*(ptr)))__gu_val;                     \
        __gu_err;                                               \
 })