linux-kernel - Re: [PATCH 04/10] percpu: make 4k first chunk allocator map memory

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Message-ID: <4A5D4A39.9020000@kernel.org>
Date:	Wed, 15 Jul 2009 12:17:13 +0900
From:	Tejun Heo <tj@...nel.org>
To:	David Howells <dhowells@...hat.com>
CC:	linux-kernel@...r.kernel.org, x86@...nel.org,
	linux-arch@...r.kernel.org, mingo@...e.hu, andi@...stfloor.org,
	hpa@...or.com, tglx@...utronix.de, cl@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 04/10] percpu: make 4k first chunk allocator map memory

Hello,

David Howells wrote:
> Tejun Heo <tj@...nel.org> wrote:
> 
>> +	pr_info("PERCPU: %d 4k pages per cpu, static data %zu bytes\n",
>> +		pcpu4k_unit_pages, static_size);
> 
> It occurs to me that this is may include a bad assumption.  Page size need not
> be 4K.  I don't know that it matters, but looking at this:
> 
>> +	vm.size = num_possible_cpus() * pcpu4k_unit_pages << PAGE_SHIFT;
>> +	vm_area_register_early(&vm, PAGE_SIZE);
> 
> It might.

Yeah, I realized that after trying to convert powerpc64 and ia64 and
renamed it to page.  I'll soon post the patches.

Thanks.

-- 
tejun
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