Re: [ANNOUNCE] udev 046 release

[Greg KH <greg@kroah.com>]

On Fri, Nov 19, 2004 at 11:00:40AM +0100, Alex Riesen wrote:
> On Fri, 19 Nov 2004 10:58:53 +0100, Alex Riesen <raa.lkml@gmail.com> wrote:
> > On Thu, 18 Nov 2004 14:44:12 -0800, Greg KH <greg@kroah.com> wrote:
> > > I've released the 046 version of udev.  It can be found at:
> > >         kernel.org/pub/linux/utils/kernel/hotplug/udev-046.tar.gz
> > 
> > I just put const's at some places. It cut down data segments, but
> > increased code size.
> > Overall still smaller:

What version of gcc are you using that causes this to happen?  And why
does it happen?  Why does the compiler think it can pack these
structures better if they are const *?


> > -rwxr-xr-x  1 user users 50420 Nov 19 10:53 ../udev-046/udev
> > -rwxr-xr-x  1 user users 49556 Nov 19 10:53 udev
> >    text    data     bss     dec     hex filename
> >   47245     968   22480   70693   11425 ../udev-046/udev
> >   48089     104   22064   70257   11271 udev
> > 
> > Also, the instance of utsname in udev_lib.c is used only once.
> 
> forgot the patch...

> * utsname used only once
> * consts help gcc pack the object tighter
> 
> diff -upr udev-046/udev_lib.c udev-046-1/udev_lib.c
> --- udev-046/udev_lib.c	2004-11-18 20:39:15.000000000 +0100
> +++ udev-046-1/udev_lib.c	2004-11-19 10:33:23.885019143 +0100
> @@ -65,12 +65,12 @@ void udev_set_values(struct udevice *ude
>  
>  int kernel_release_satisfactory(int version, int patchlevel, int sublevel)
>  {
> -	static struct utsname uts;
>  	static int kversion = 0;
>  	static int kpatchlevel;
>  	static int ksublevel;
>  
>  	if (kversion = 0) {
> +		struct utsname uts;
>  		if (uname(&uts) != 0)
>  			return -1;
>  

No, this should be fixed up to only call uname once.  We do call it
multiple times from the same program, and that could be optimized.

thanks,

greg k-h


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