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

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Message-ID: <86802c440808022121u3dcdbda2s5ff463f4b330ca17@mail.gmail.com>
Date:	Sat, 2 Aug 2008 21:21:14 -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 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...

you can not pass compiling

+#define DEFINE_DYN_ARRAY(nameX, sizeX, nrX, alignX, init_workX) \
+               static struct dyn_array __dyn_array_##nameX __initdata = \
+               {       .name = (void **)&nameX,\
+                       .size = sizeX,\
+                       .nr   = &nrX,\
+                       .align = alignX,\
+                       .init_work = init_workX,\
+               }; \
+               static struct dyn_array *__dyn_array_ptr_##nameX __used \
+               __attribute__((__section__(".dyn_array.init"))) = \
+                       &__dyn_array_##nameX
+

YH
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