From: Joe Perches
> Sent: 18 February 2016 04:59
> On Wed, 2016-02-17 at 19:38 -0800, Jeff Kirsher wrote:
> > From: Mitch Williams <mitch.a.willi...@intel.com>
> >
> > Mr. Spock would certainly raise an eyebrow to see us using bitwise
> > operators, when we should clearly be relying on logic. Fascinating.
>
> I think it read better before this change.
>
> Spock might have looked at the type of the
> variable before raising that eyebrow.
>
> clean_complete is bool so it's not actually a
> bitwise operation,
Except that, of course, you may well want a bitwise operation
in order to remove slow conditional instructions.
Hopefully gcc generates a bit-wise 'and' provided that i40e_clean_tx_irq()
returns a 'bool'.
David
> > diff --git a/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> b/drivers/net/ethernet/intel/i40e/i40e_txrx.c
> []
> > @@ -1996,7 +1996,8 @@ int i40e_napi_poll(struct napi_struct *napi, int
> > budget)
> > * budget and be more aggressive about cleaning up the Tx descriptors.
> > */
> > i40e_for_each_ring(ring, q_vector->tx) {
> > - clean_complete &= i40e_clean_tx_irq(ring, vsi->work_limit);
> > + clean_complete = clean_complete &&
> > + i40e_clean_tx_irq(ring, vsi->work_limit);
>
> etc...
