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;