Re: [PATCH] ifplugd: simple code shrink (~ -43)

Maksym Kryzhanovskyy xmaks at email.cz
Sun Jul 11 08:53:05 UTC 2010


> On Saturday 10 July 2010 21:28, Maksym Kryzhanovskyy wrote:
> > I does the following:
> > 
> > $ git clone git://busybox.net/busybox.git
> > $ cd busybox
> > $ make defconfig
> > $ make
> > $ make baseline
> > $ patch -p1 < ../busybox.ifplugd.logic.patch
> > $ make
> > $ make bloatcheck
> > 
> > It still counts -76 bytes. What is wrong?
> 
> You must be making a mistake somewhere, because:
> 
> > > > function                                             old     new   delta
> > > > ifplugd_main                                        1056    1119     +63
> > > > maybe_up_new_iface                                    33      35      +2
> > > > detect_link                                          216     208      -8
> > > > detect_link_wlan                                     120      99     -21
> > > > set_ifreq_to_ifname                                   32       -     -32
> 
> you somehow "lost" set_ifreq_to_ifname function in new binary -
> look at the line just above: bloatcheck says it's gone.
> Which is very wrong.
> 
> Run "make networking/ifplugd.s" in old and new tree,
> look at ifplugd.s and try to figure out how the hell
> it happened that your gcc threw out or inlined set_ifreq_to_ifname.
> 

In the new code 'set_ifreq_to_ifname:' is generated as 'T.52:' (see attachement).

Max.

> -- 
> vda
> 
> 
> 
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