linux-kernel - Re: [PATCH 03/25] add dyn

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Message-ID: <86802c440808022239i447f9627t98e5867b0b08e709@mail.gmail.com>
Date:	Sat, 2 Aug 2008 22:39:01 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Johannes Weiner" <hannes@...urebad.de>
Cc:	"Ingo Molnar" <mingo@...e.hu>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	"Dhaval Giani" <dhaval@...ux.vnet.ibm.com>,
	"Mike Travis" <travis@....com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 03/25] add dyn_array support

On Sat, Aug 2, 2008 at 10:31 PM, Johannes Weiner <hannes@...urebad.de> wrote:
> Hi,
>
> "Yinghai Lu" <yhlu.kernel@...il.com> writes:
>
>> On Sat, Aug 2, 2008 at 9:55 PM, Johannes Weiner <hannes@...urebad.de> wrote:
>>> Hi,
>>>
>>> "Yinghai Lu" <yhlu.kernel@...il.com> writes:
>>>
>>>> On Sat, Aug 2, 2008 at 9:03 PM, Johannes Weiner <hannes@...urebad.de> wrote:
>>>>> Hi,
>>>>>
>>>>> Yinghai Lu <yhlu.kernel@...il.com> writes:
>>>>>
>>>>>> could have crazy big arrays and allocate them in bootmem at init stage.
>>>>>> also also to allocate array according to size we need to use to avoid wasting
>>>>>> memory
>>>>>> use CONFIG_HAVE_DYN_ARRAY to enable it or not
>>>>>>
>>>>>> usage:
>>>>>>
>>>>>> |static struct irq_desc irq_desc_init __initdata = {
>>>>>> |       .status = IRQ_DISABLED,
>>>>>> |       .chip = &no_irq_chip,
>>>>>> |       .handle_irq = handle_bad_irq,
>>>>>> |       .depth = 1,
>>>>>> |       .lock = __SPIN_LOCK_UNLOCKED(irq_desc->lock),
>>>>>> |#ifdef CONFIG_SMP
>>>>>> |       .affinity = CPU_MASK_ALL
>>>>>> |#endif
>>>>>> |};
>>>>>> |
>>>>>> |static void __init init_work(void *data)
>>>>>> |{
>>>>>> |       struct dyn_array *da = data;
>>>>>> |       struct  irq_desc *desc;
>>>>>> |       int i;
>>>>>> |
>>>>>> |       desc = *da->name;
>>>>>
>>>>> Where *da->name might be NULL...
>>
>> *da->name = __alloc_bootmem_nopanic(size, da->align, phys);
>
> Exactly.  Now, look up the possible return values of
> __alloc_bootmem_nopanic and we are almost there...

04 fix that via allocating that all together

YH
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