[PATCH] domain_codec: optimize call to dname_enc

[Bernhard Reutner-Fischer]

On Thu, 11 Jun 2020 13:12:53 -0500
Martin Lewis <martin.lewis.x84 at gmail.com> wrote:

> Hi,
> Yes, looks good :)

PS: i was at first a bit thrown off by the function name to talk about
DNAME RR (as opposed to CNAME RR resp. domain_name) but in the context
of dhcp as opposed to dns it makes more sense i suppose. I'd expand the
function name to resolve ambiguity in the network context, fwiw.

thanks,
> 
> Martin
> 
> On Wed, 10 Jun 2020 at 10:21, Denys Vlasenko <vda.linux at googlemail.com>
> wrote:
> 
> > Thanks. I addressed this a bit differently. Looks good now?
> >
> > On Tue, Jun 9, 2020 at 4:55 PM Martin Lewis <martin.lewis.x84 at gmail.com>
> > wrote:  
> > >
> > > The only call to dname_enc is with cstr = NULL, so most of dname_enc's  
> > logic is not used.  
> > > Therefore, we can directly call convert_dname and shrink the binary size.
> > >
> > > function                                             old     new   delta
> > > convert_dname                                          -     143    +143
> > > attach_option                                        463     493     +30
> > > dname_enc                                            445       -    -445
> > >  
> > ------------------------------------------------------------------------------  
> > > (add/remove: 1/1 grow/shrink: 1/0 up/down: 173/-445)         Total: -272
> > > bytes
> > >    text    data     bss     dec     hex filename
> > >  993252   16923    1872 1012047   f714f busybox_old
> > >  992980   16923    1872 1011775   f703f busybox_unstripped
> > >
> > > Signed-off-by: Martin Lewis <martin.lewis.x84 at gmail.com>
> > > ---
> > >  networking/udhcp/common.c       | 6 +++++-
> > >  networking/udhcp/common.h       | 1 +
> > >  networking/udhcp/domain_codec.c | 2 +-
> > >  3 files changed, 7 insertions(+), 2 deletions(-)