tile: fix put_user sparse errors

Use x86's __inttype macro instead of using the typeof(x-x) trick to
generate a suitable integer size type.  This avoids a sparse warning
when examining the x-x type with a bitwise type.

Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Chris Metcalf <cmetcalf@ezchip.com>

diff --git a/arch/tile/include/asm/uaccess.h b/arch/tile/include/asm/uaccess.h
index b6cde3209b963d76ba35815d45b003ef929691f2..b81b24a8489baebebe006434597c03bcc232b07c 100644 (file)
--- a/arch/tile/include/asm/uaccess.h
+++ b/arch/tile/include/asm/uaccess.h
@@ -113,15 +113,15 @@ struct exception_table_entry {
 
 extern int fixup_exception(struct pt_regs *regs);
 
+/*
+ * This is a type: either unsigned long, if the argument fits into
+ * that type, or otherwise unsigned long long.
+ */
+#define __inttype(x) \
+       __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
+
 /*
  * Support macros for __get_user().
- *
- * Implementation note: The "case 8" logic of casting to the type of
- * the result of subtracting the value from itself is basically a way
- * of keeping all integer types the same, but casting any pointers to
- * ptrdiff_t, i.e. also an integer type.  This way there are no
- * questionable casts seen by the compiler on an ILP32 platform.
- *
  * Note that __get_user() and __put_user() assume proper alignment.
  */
 
@@ -178,7 +178,7 @@ extern int fixup_exception(struct pt_regs *regs);
                             "9:"                                       \
                             : "=r" (ret), "=r" (__a), "=&r" (__b)      \
                             : "r" (ptr), "i" (-EFAULT));               \
-               (x) = (__typeof(x))(__typeof((x)-(x)))                  \
+               (x) = (__force __typeof(x))(__inttype(x))               \
                        (((u64)__hi32(__a, __b) << 32) |                \
                         __lo32(__a, __b));                             \
        })
@@ -246,7 +246,7 @@ extern int __get_user_bad(void)
 #define __put_user_4(x, ptr, ret) __put_user_asm(sw, x, ptr, ret)
 #define __put_user_8(x, ptr, ret)                                      \
        ({                                                              \
-               u64 __x = (__typeof((x)-(x)))(x);                       \
+               u64 __x = (__force __inttype(x))(x);                    \
                int __lo = (int) __x, __hi = (int) (__x >> 32);         \
                asm volatile("1: { sw %1, %2; addi %0, %1, 4 }\n"       \
                             "2: { sw %0, %3; movei %0, 0 }\n"          \