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[NIU]: Cleanup PAGE_SIZE checks a bit

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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>
This commit is contained in:
Olof Johansson 2007-10-21 16:32:58 -07:00 committed by David S. Miller
parent deea84b0ae
commit 81429973cf
1 changed files with 5 additions and 29 deletions
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34
drivers/net/niu.c
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@ -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);