linux-kernel - Re: [Xen-devel] [PATCH RFC] xen-block: correctly define structures in public headers

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Date:	Tue, 3 Dec 2013 12:18:03 +0100
From:	Roger Pau Monné <roger.pau@...rix.com>
To:	Jan Beulich <JBeulich@...e.com>
CC:	David Vrabel <david.vrabel@...rix.com>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>,
	Julien Grall <julien.grall@...aro.org>,
	<xen-devel@...ts.xenproject.org>,
	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [Xen-devel] [PATCH RFC] xen-block: correctly define structures
 in public headers

On 03/12/13 12:14, Jan Beulich wrote:
>>>> On 03.12.13 at 11:57, Roger Pau Monne <roger.pau@...rix.com> wrote:
>>  struct blkif_request_rw {
>>  	uint8_t        nr_segments;  /* number of segments                   */
>>  	blkif_vdev_t   handle;       /* only for read/write requests         */
>> -#ifdef CONFIG_X86_64
>> -	uint32_t       _pad1;	     /* offsetof(blkif_request,u.rw.id) == 8 */
>> -#endif
>>  	uint64_t       id;           /* private guest value, echoed in resp  */
>>  	blkif_sector_t sector_number;/* start sector idx on disk (r/w only)  */
>>  	struct blkif_request_segment {
>> @@ -157,47 +154,36 @@ struct blkif_request_rw {
>>  		/* @last_sect: last sector in frame to transfer (inclusive).     */
>>  		uint8_t     first_sect, last_sect;
>>  	} seg[BLKIF_MAX_SEGMENTS_PER_REQUEST];
>> -} __attribute__((__packed__));
>> +};
> 
> Removing the packed attribute here and below is not possible
> as long as the defined structures get used in struct blkif_request
> as the second field after a uint8_t one, and as long as the
> individual fields here aren't natively aligned.

Sorry, the patch is incorrect, let me resend that.

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