[NIU]: Cleanup PAGE_SIZE checks a bit

I get the following warning from a powerpc allyesconfig of current
mainline:

drivers/net/niu.c: In function 'niu_size_rbr':
drivers/net/niu.c:3113: warning: large integer implicitly truncated to unsigned type

PAGE_SIZE in this case is 64KB, so I don't quite get why gcc can't
tell that the line in question will never be reached.

I suggest the following instead, but I can unfortunately not do
anything but build test it.

Also, the driver does some other checks to make sure that PAGE_SIZE is
a power of two (BUILD_BUG_ON() in niu_init()), doesn't seem like that
could ever be untrue? Or are there really archs with non-power-of-two
PAGE_SIZE?

Signed-off-by: Olof Johansson <olof@lixom.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 5 insertions, 29 deletions

diff --git a/drivers/net/niu.c b/drivers/net/niu.c
index ed1f9bbb2a32..112ab079ce7d 100644
--- a/drivers/net/niu.c
+++ b/drivers/net/niu.c
@@ -3103,31 +3103,12 @@ static int niu_alloc_tx_ring_info(struct niu *np,
 
 static void niu_size_rbr(struct niu *np, struct rx_ring_info *rp)
 {
-        u16 bs;
+        u16 bss;
 
-        switch (PAGE_SIZE) {
-        case 4 * 1024:
-        case 8 * 1024:
-        case 16 * 1024:
-        case 32 * 1024:
-                rp->rbr_block_size = PAGE_SIZE;
-                rp->rbr_blocks_per_page = 1;
-                break;
+        bss = min(PAGE_SHIFT, 15);
 
-        default:
-                if (PAGE_SIZE % (32 * 1024) == 0)
-                        bs = 32 * 1024;
-                else if (PAGE_SIZE % (16 * 1024) == 0)
-                        bs = 16 * 1024;
-                else if (PAGE_SIZE % (8 * 1024) == 0)
-                        bs = 8 * 1024;
-                else if (PAGE_SIZE % (4 * 1024) == 0)
-                        bs = 4 * 1024;
-                else
-                        BUG();
-                rp->rbr_block_size = bs;
-                rp->rbr_blocks_per_page = PAGE_SIZE / bs;
-        }
+        rp->rbr_block_size = 1 << bss;
+        rp->rbr_blocks_per_page = 1 << (PAGE_SHIFT-bss);
 
         rp->rbr_sizes[0] = 256;
         rp->rbr_sizes[1] = 1024;
@@ -7902,12 +7883,7 @@ static int __init niu_init(void)
 {
         int err = 0;
 
-        BUILD_BUG_ON((PAGE_SIZE < 4 * 1024) ||
-                     ((PAGE_SIZE > 32 * 1024) &&
-                      ((PAGE_SIZE % (32 * 1024)) != 0 &&
-                       (PAGE_SIZE % (16 * 1024)) != 0 &&
-                       (PAGE_SIZE % (8 * 1024)) != 0 &&
-                       (PAGE_SIZE % (4 * 1024)) != 0)));
+        BUILD_BUG_ON(PAGE_SIZE < 4 * 1024);
 
         niu_debug = netif_msg_init(debug, NIU_MSG_DEFAULT);