linux-kernel - Re: [RESEND PATCH] scsi: make struct scsi_varlen_cdb

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Date:	Thu, 11 Oct 2012 11:24:29 +0100
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	James Hogan <james.hogan@...tec.com>
Cc:	linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RESEND PATCH] scsi: make struct scsi_varlen_cdb_hdr packed

On Thu, 2012-10-11 at 10:15 +0100, James Hogan wrote:
> The struct scsi_varlen_cdb_hdr is expected to be exactly 10 bytes when
> used in struct osd_cdb_head, but it isn't marked as packed. Some
> architectures will round the struct size up which triggers BUILD_BUG_ON
> compile errors in osd_initiator.c when the outer structs are unexpected
> sizes. This is fixed by marking struct scsi_varlen_cdb_hdr as __packed.

What actual problem have you encountered? The structure is {u8[8], u16}
which is naturally packed on every architecture I know about.  I've even
built osd_initiator without problem on parisc, which has some of the
most rigid alignment rules I've seen.

James


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