proc: fix sparse warnings in pagemap_read()

fs/proc/task_mmu.c:696:12: warning: cast removes address space of expression
fs/proc/task_mmu.c:696:9: warning: incorrect type in assignment (different address spaces)
fs/proc/task_mmu.c:696:9:    expected unsigned long long [noderef] [usertype] <asn:1>*out
fs/proc/task_mmu.c:696:9:    got unsigned long long [usertype] *<noident>
fs/proc/task_mmu.c:697:12: warning: cast removes address space of expression
fs/proc/task_mmu.c:697:9: warning: incorrect type in assignment (different address spaces)
fs/proc/task_mmu.c:697:9:    expected unsigned long long [noderef] [usertype] <asn:1>*end
fs/proc/task_mmu.c:697:9:    got unsigned long long [usertype] *<noident>
fs/proc/task_mmu.c:723:12: warning: cast removes address space of expression
fs/proc/task_mmu.c:723:26: error: subtraction of different types can't work (different address spaces)
fs/proc/task_mmu.c:725:24: error: subtraction of different types can't work (different address spaces)

Signed-off-by: Milind Arun Choudhary <milindchoudhary@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>

fs/proc/task_mmu.c

@@ -693,8 +693,8 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
 		goto out_pages;
 	}
 
-	pm.out = (u64 *)buf;
-	pm.end = (u64 *)(buf + count);
+	pm.out = (u64 __user *)buf;
+	pm.end = (u64 __user *)(buf + count);
 
 	pagemap_walk.pmd_entry = pagemap_pte_range;
 	pagemap_walk.pte_hole = pagemap_pte_hole;
@@ -720,9 +720,9 @@ static ssize_t pagemap_read(struct file *file, char __user *buf,
 	if (ret == PM_END_OF_BUFFER)
 		ret = 0;
 	/* don't need mmap_sem for these, but this looks cleaner */
-	*ppos += (char *)pm.out - buf;
+	*ppos += (char __user *)pm.out - buf;
 	if (!ret)
-		ret = (char *)pm.out - buf;
+		ret = (char __user *)pm.out - buf;
 
 out_pages:
 	for (; pagecount; pagecount--) {