spidev compiler warning gone

Get rid of annoying GCC warning on 32-bit platforms.

drivers/spi/spidev.c: In function 'spidev_message':
drivers/spi/spidev.c:184: warning: cast to pointer from integer of different size
drivers/spi/spidev.c:216: warning: cast to pointer from integer of different size

The trick is to add an extra cast using "ptrdiff_t" to convert the u64 to
the correct size integer, and only then casting it into a "void *" pointer.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 2 deletions

diff --git a/drivers/spi/spidev.c b/drivers/spi/spidev.c
index d04242aee40d..38b60ad0eda0 100644
--- a/drivers/spi/spidev.c
+++ b/drivers/spi/spidev.c
@@ -181,7 +181,8 @@ static int spidev_message(struct spidev_data *spidev,
                 }
                 if (u_tmp->tx_buf) {
                         k_tmp->tx_buf = buf;
-                        if (copy_from_user(buf, (const u8 __user *)u_tmp->tx_buf,
+                        if (copy_from_user(buf, (const u8 __user *)
+                                                (ptrdiff_t) u_tmp->tx_buf,
                                         u_tmp->len))
                                 goto done;
                 }
@@ -213,7 +214,8 @@ static int spidev_message(struct spidev_data *spidev,
         buf = spidev->buffer;
         for (n = n_xfers, u_tmp = u_xfers; n; n--, u_tmp++) {
                 if (u_tmp->rx_buf) {
-                        if (__copy_to_user((u8 __user *)u_tmp->rx_buf, buf,
+                        if (__copy_to_user((u8 __user *)
+                                        (ptrdiff_t) u_tmp->rx_buf, buf,
                                         u_tmp->len)) {
                                 status = -EFAULT;
                                 goto done;