Re: [2.6 patch] i386/x86_64 mpparse.c: kill maxcpus

[Adrian Bunk]

On Sun, Mar 20, 2005 at 07:01:49PM -0500, Dave Jones wrote:
> On Mon, Mar 21, 2005 at 12:59:46AM +0100, Adrian Bunk wrote:
>  > On Sun, Mar 20, 2005 at 06:32:03PM -0500, Dave Jones wrote:
>  > > On Mon, Mar 21, 2005 at 12:12:32AM +0100, Adrian Bunk wrote:
>  > >  > On Sun, Mar 20, 2005 at 05:42:34PM -0500, Dave Jones wrote:
>  > >  > > On Sun, Mar 20, 2005 at 08:25:49PM +0100, Adrian Bunk wrote:
>  > >  > >  > Do we really need a global variable that does only hold the value of 
>  > >  > >  > NR_CPUS?
>  > >  > > 
>  > >  > > Yes.
>  > >  > >  
>  > >  > > NR_CPUS = compile time
>  > >  > > maxcpus = boot command line at runtime.
>  > >  > 
>  > >  > If this is how is was expected to work - it isn't exactly what is 
>  > >  > currently implemented.
>  > > 
>  > > It's ugly, as its setting the same thing in two different places, but
>  > > I don't see any obvious reason why it won't work.
>  > >...
>  > 
>  > I might be too dumb, but where are the mpparse.c maxcpus variables ever 
>  > set to any value different from NR_CPUS?
> 
> arch/x86_64/kernel/setup.c:parse_cmdline_early()
> 
> 	...
>         else if (!memcmp(from, "maxcpus=", 8)) {
>             extern unsigned int maxcpus;
> 
>             maxcpus = simple_strtoul(from + 8, NULL, 0);
>         }
> 	...

Ah, thanks.

I didn't see this extern declaration.
(and my test compiles were with SMP=n...)

> 		Dave

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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