fix abuses of ptrdiff_t

Use of ptrdiff_t in places like

-                       if (!access_ok(VERIFY_WRITE, u_tmp->rx_buf, u_tmp->len))
+                       if (!access_ok(VERIFY_WRITE, (u8 __user *)
+                                               (ptrdiff_t) u_tmp->rx_buf,
+                                               u_tmp->len))

is wrong; for one thing, it's a bad C (it's what uintptr_t is for; in general
we are not even promised that ptrdiff_t is large enough to hold a pointer,
just enough to hold a difference between two pointers within the same object).
For another, it confuses the fsck out of sparse.

Use unsigned long or uintptr_t instead.  There are several places misusing
ptrdiff_t; fixed.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 6 deletions

diff --git a/drivers/scsi/aacraid/commctrl.c b/drivers/scsi/aacraid/commctrl.c
index 72b0393b4596..1e6d7a9c75bf 100644
--- a/drivers/scsi/aacraid/commctrl.c
+++ b/drivers/scsi/aacraid/commctrl.c
@@ -391,7 +391,7 @@ static int close_getadapter_fib(struct aac_dev * dev, void __user *arg)
 		/*
 		 *	Extract the fibctx from the input parameters
 		 */
-		if (fibctx->unique == (u32)(ptrdiff_t)arg) /* We found a winner */
+		if (fibctx->unique == (u32)(uintptr_t)arg) /* We found a winner */
 			break;
 		entry = entry->next;
 		fibctx = NULL;
@@ -590,7 +590,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 				}
 				addr = (u64)upsg->sg[i].addr[0];
 				addr += ((u64)upsg->sg[i].addr[1]) << 32;
-				sg_user[i] = (void __user *)(ptrdiff_t)addr;
+				sg_user[i] = (void __user *)(uintptr_t)addr;
 				sg_list[i] = p; // save so we can clean up later
 				sg_indx = i;
 
@@ -633,7 +633,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 					rcode = -ENOMEM;
 					goto cleanup;
 				}
-				sg_user[i] = (void __user *)(ptrdiff_t)usg->sg[i].addr;
+				sg_user[i] = (void __user *)(uintptr_t)usg->sg[i].addr;
 				sg_list[i] = p; // save so we can clean up later
 				sg_indx = i;
 
@@ -664,7 +664,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 		if (actual_fibsize64 == fibsize) {
 			struct user_sgmap64* usg = (struct user_sgmap64 *)upsg;
 			for (i = 0; i < upsg->count; i++) {
-				u64 addr;
+				uintptr_t addr;
 				void* p;
 				/* Does this really need to be GFP_DMA? */
 				p = kmalloc(usg->sg[i].count,GFP_KERNEL|__GFP_DMA);
@@ -676,7 +676,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 				}
 				addr = (u64)usg->sg[i].addr[0];
 				addr += ((u64)usg->sg[i].addr[1]) << 32;
-				sg_user[i] = (void __user *)(ptrdiff_t)addr;
+				sg_user[i] = (void __user *)addr;
 				sg_list[i] = p; // save so we can clean up later
 				sg_indx = i;
 
@@ -704,7 +704,7 @@ static int aac_send_raw_srb(struct aac_dev* dev, void __user * arg)
 					rcode = -ENOMEM;
 					goto cleanup;
 				}
-				sg_user[i] = (void __user *)(ptrdiff_t)upsg->sg[i].addr;
+				sg_user[i] = (void __user *)(uintptr_t)upsg->sg[i].addr;
 				sg_list[i] = p; // save so we can clean up later
 				sg_indx = i;