linux-kernel - Re: [PARAVIRT/x86] BUGFIX: Put a missing paravirt_release_pmd in pgd

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Date:	Fri, 06 Feb 2009 09:00:57 -0800
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
CC:	akataria@...are.com, "H. Peter Anvin" <hpa@...or.com>,
	the arch/x86 maintainers <x86@...nel.org>,
	Zach Amsden <zach@...are.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Rohit Jain <rjain@...are.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PARAVIRT/x86] BUGFIX: Put a missing paravirt_release_pmd in
 pgd_dtor

Ingo Molnar wrote:
> * Jeremy Fitzhardinge <jeremy@...p.org> wrote:
>
>   
>> Alok Kataria wrote:
>>     
>>> As it affects only VMI, instead of adding another callback, i have
>>> hooked on the paravirt_pgd_free call for vmi to release the pgd page.
>>> Below is the patch. I will run some overnight tests with this patch and
>>> get back if there are any errors.
>>>   
>>>       
>> I'd forgotten that I'd already added pgd_alloc/pgd_free.  So, yes, just  
>> use pgd_free.
>>     
>
> Can i take that as an Acked-by?
>   

Yeah.  Though:
>  /*
> + * We hack the pgd_free hook for releasing the pgd page.
>   
Its hardly a hack to use a hook for exactly its intended purpose...
> + */
> +static void vmi_pgd_free(struct mm_struct *mm, pgd_t *pgd)
> +{
> +	unsigned long pfn = __pa(pgd) >> PAGE_SHIFT;
> +
> +	vmi_ops.release_page(pfn, VMI_PAGE_L2);
> +}
> +

Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>

    J
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