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

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Date:	Mon, 15 Sep 2008 17:30:48 +0200
From:	Marco Stornelli <marco.stornelli@...itel.it>
To:	Linux AVR32 <kernel@...32linux.org>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] avr32: added mem kernel command line option support

From: Marco Stornelli <marco.stornelli@...il.com>

Fixed the type of size and start, now they are resource_size_t.
Fixed the double pointer parameter, now it's only a single pointer.
Signed-off-by: Marco Stornelli <marco.stornelli@...il.com>
---
--- linux-2.6.26.5/arch/avr32/kernel/setup.c.orig    2008-09-15 11:30:00.000000000 +0200

+++ linux-2.6.26.5/arch/avr32/kernel/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[KkMmGg]"
+ */
+static int __init early_mem(char *p)
+{
+ resource_size_t size, start;
+
+ start = system_ram->start;
+ size = memparse(p, &p);
+ 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 Dunlap ha scritto:
> 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/
>
>   

-- 
Marco Stornelli
Embedded Software Engineer
CoRiTeL - Consorzio di Ricerca sulle Telecomunicazioni
http://www.coritel.it

marco.stornelli@...itel.it
+39 06 72582838

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