linux-kernel - Re: [Xen-devel] [PATCH v2 02/20] xen: Introduce a function to split a Linux page into Xen page

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Message-ID: <55A7C5A1.7060006@citrix.com>
Date:	Thu, 16 Jul 2015 16:54:25 +0200
From:	Julien Grall <julien.grall@...rix.com>
To:	Stefano Stabellini <stefano.stabellini@...citrix.com>
CC:	<ian.campbell@...rix.com>, <linux-kernel@...r.kernel.org>,
	David Vrabel <david.vrabel@...rix.com>,
	<xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [Xen-devel] [PATCH v2 02/20] xen: Introduce a function to split
 a Linux page into Xen page

Hi Stefano,

On 16/07/2015 16:23, Stefano Stabellini wrote:
>> diff --git a/include/xen/page.h b/include/xen/page.h
>> index 8ebd37b..b1f7722 100644
>> --- a/include/xen/page.h
>> +++ b/include/xen/page.h
>> @@ -39,4 +39,24 @@ struct xen_memory_region xen_extra_mem[XEN_EXTRA_MEM_MAX_REGIONS];
>>
>>   extern unsigned long xen_released_pages;
>>
>> +typedef int (*xen_pfn_fn_t)(struct page *page, unsigned long pfn, void *data);
>> +/* Break down the page in 4KB granularity and call fn foreach xen pfn */
>> +static inline int xen_apply_to_page(struct page *page, xen_pfn_fn_t fn,
>> +				    void *data)
>> +{
>> +	unsigned long pfn = xen_page_to_pfn(page);
>> +	int i;
>> +	int ret;
>
> please initialize ret to 0

Hmmm... right. I'm not sure why the compiler didn't catch it.

>
>> +	for (i = 0; i < XEN_PFN_PER_PAGE; i++, pfn++) {
>> +		ret = fn(page, pfn, data);
>> +		if (ret)
>> +			return ret;
>> +	}
>> +
>> +	return ret;
>> +}
>> +
>> +
>>   #endif	/* _XEN_PAGE_H */
>
>
> Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>

Thank you,

-- 
Julien Grall
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