On Wed, Jul 09, 2014 at 08:52:07PM +0100, Michalis Pappas wrote:
> On 07/09/2014 07:51 PM, Greg KH wrote:
> > On Tue, Jul 01, 2014 at 02:00:15PM +0100, Michalis Pappas wrote:
> >> Signed-off-by: Michalis Pappas <mpappas@xxxxxxxxxxx>
> >> ---
> >> drivers/staging/gdm72xx/gdm_qos.c | 2 ++
> >> drivers/staging/gdm72xx/gdm_sdio.c | 7 +++++++
> >> drivers/staging/gdm72xx/gdm_usb.c | 7 +++++++
> >> drivers/staging/gdm72xx/gdm_wimax.c | 6 ++++++
> >> drivers/staging/gdm72xx/gdm_wimax.h | 2 ++
> >> 5 files changed, 24 insertions(+)
> >>
> >> diff --git a/drivers/staging/gdm72xx/gdm_qos.c b/drivers/staging/gdm72xx/gdm_qos.c
> >> index b08c8e1..7900981 100644
> >> --- a/drivers/staging/gdm72xx/gdm_qos.c
> >> +++ b/drivers/staging/gdm72xx/gdm_qos.c
> >> @@ -88,7 +88,9 @@ static void free_qos_entry_list(struct list_head *free_list)
> >> total_free++;
> >> }
> >>
> >> + #if defined(GDM72xx_DEBUG)
> >> pr_debug("%s: total_free_cnt=%d\n", __func__, total_free);
> >> + #endif
> >
> > Ick, no, never put #ifdef in .c code if you can help it. For stuff like
> > this, just rely on the dynamic debug core and use the pr_debug and
> > dev_dbg() calls, like the driver is doing, so all should be fine.
> >
>
> But how about those cases where debug code consists of more than a
> simple call to pr_debug() / dev_dbg()?
Then that code is wrong :)
> For instance consider dump_eth_packet(), defined in gdm_wimax.c. This
> function is called every time a packet is received or transmitted, and
> calls other helper functions too (get_protocol_name(),
> get_ip_protocol_name(), get_port_name()).
>
> Doesn't all this debug logic provide an overhead to the tx / rx functions?
Yes, so much so it doesn't make sense to even have that type of
function, right?
greg k-h
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