To prepare for supporting boot-time page size selection, refactor code
to remove assumptions about PAGE_SIZE being compile-time constant. Code
intended to be equivalent when compile-time page size is active.

Convert CPP conditionals to C conditionals. The compiler will dead code
strip when doing a compile-time page size build, for the same end
effect. But this will also work with boot-time page size builds.

Signed-off-by: Ryan Roberts <[email protected]>
---

***NOTE***
Any confused maintainers may want to read the cover note here for context:
https://lore.kernel.org/all/[email protected]/

 drivers/net/ethernet/intel/igbvf/netdev.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/net/ethernet/intel/igbvf/netdev.c 
b/drivers/net/ethernet/intel/igbvf/netdev.c
index 925d7286a8ee4..2e11d999168de 100644
--- a/drivers/net/ethernet/intel/igbvf/netdev.c
+++ b/drivers/net/ethernet/intel/igbvf/netdev.c
@@ -2419,12 +2419,10 @@ static int igbvf_change_mtu(struct net_device *netdev, 
int new_mtu)
                adapter->rx_buffer_len = 1024;
        else if (max_frame <= 2048)
                adapter->rx_buffer_len = 2048;
-       else
-#if (PAGE_SIZE / 2) > 16384
+       else if ((PAGE_SIZE / 2) > 16384)
                adapter->rx_buffer_len = 16384;
-#else
+       else
                adapter->rx_buffer_len = PAGE_SIZE / 2;
-#endif
 
        /* adjust allocation if LPE protects us, and we aren't using SBP */
        if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
-- 
2.43.0

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