Re: [Xen-devel] [PATCH] xen: selfballoon: remove unnecessary static in frontswap_selfshrink()

["Gustavo A. R. Silva" <garsilva@xxxxxxxxxxxxxx>]

Hi Juergen,

On 07/21/2017 02:36 AM, Juergen Gross wrote:
> On 04/07/17 20:34, Gustavo A. R. Silva wrote:
> > Remove unnecessary static on local variables last_frontswap_pages and
> > tgt_frontswap_pages. Such variables are initialized before being used,
> > on every execution path throughout the function. The statics have no
> > benefit and, removing them reduce the code size.
> >
> > This issue was detected using Coccinelle and the following semantic patch:
> >
> > @bad exists@
> > position p;
> > identifier x;
> > type T;
> > @@
> >
> > static T x@p;
> > ...
> > x = <+...x...+>
> >
> > @@
> > identifier x;
> > expression e;
> > type T;
> > position p != bad.p;
> > @@
> >
> > -static
> >  T x@p;
> >  ... when != x
> >      when strict
> > ?x = e;
> >
> > You can see a significant difference in the code size after executing
> > the size command, before and after the code change:
> >
> > before:
> >    text    data     bss     dec     hex filename
> >    5633    3452     384    9469    24fd drivers/xen/xen-selfballoon.o
> >
> > after:
> >    text    data     bss     dec     hex filename
> >    5576    3308     256    9140    23b4 drivers/xen/xen-selfballoon.o
> >
> > Signed-off-by: Gustavo A. R. Silva <garsilva@xxxxxxxxxxxxxx>
> Reviewed-by: Juergen Gross <jgross@xxxxxxxx>
Thank you!

--
Gustavo A. R. Silva

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