linux-kernel - Re: [PATCH 1/1] avr32: added mem kernel command line option support

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Date:	Mon, 15 Sep 2008 08:05:17 -0700
From:	Randy Dunlap <randy.dunlap@...cle.com>
To:	Marco Stornelli <marco.stornelli@...itel.it>
Cc:	Linux AVR32 <kernel@...32linux.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] avr32: added mem kernel command line option support

On Mon, 15 Sep 2008 16:57:10 +0200 Marco Stornelli wrote:

> If you see the above function early_parse_fbmem:
> 
> static int __init early_parse_fbmem(char *p)
> {
> int ret;
> unsigned long align;
> 
> fbmem_size = memparse(p, &p);
> .........
> 
> where fbmem_size is a resource_size_t (u32 because avr32 is a 32-bit
> architecture), so I used the same philosophy. Maybe I can remove
> unsigned long and replace it with resource_size_t to be more uniform.

Yes, I think that would be better.

Thanks.

> Randy Dunlap ha scritto:
> > On Mon, 15 Sep 2008 12:07:19 +0200 Marco Stornelli wrote:
> >
> >   
> >> From: Marco Stornelli <marco.stornelli@...il.com>
> >>
> >> Added support for the mem kernel command line option
> >> Signed-off-by: Marco Stornelli <marco.stornelli@...il.com>
> >> ---
> >> --- setup.c.orig    2008-09-15 11:30:00.000000000 +0200
> >> +++ setup.c    2008-09-15 11:30:17.000000000 +0200
> >> @@ -283,6 +283,25 @@ static int __init early_parse_fbmem(char
> >>  }
> >>  early_param("fbmem", early_parse_fbmem);
> >>  
> >> +/*
> >> + * Pick out the memory size.  We look for mem=size@...rt,
> >> + * where start and size are "size[KkMm]"
> >>     
> >
> >                                     [KkMmGg]
> >
> >   
> >> + */
> >> +static int __init early_mem(char **p)
> >> +{
> >> +    unsigned long size, start;
> >> +
> >> +    start = system_ram->start;
> >> +    size  = memparse(*p, p);
> >>     
> >
> > memparse() returns an unsigned long long.  Is the truncation OK for avr32?
> >
> >   
> >> +    if (**p == '@')
> >> +        start = memparse(*p + 1, p);
> >> +
> >> +    system_ram->start = start;
> >> +    system_ram->end = system_ram->start + size - 1;
> >> +    return 0;
> >> +}
> >> +early_param("mem", early_mem);
> >> +
> >>  static int __init parse_tag_core(struct tag *tag)
> >>  {
> >>      if (tag->hdr.size > 2) {
> >> --


---
~Randy
Linux Plumbers Conference, 17-19 September 2008, Portland, Oregon USA
http://linuxplumbersconf.org/
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