netdev - Re: [PATCH 2/9] ocrdma: Driver for Emulex OneConnect RDMA adapter

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Message-ID: <20120322205824.GC9614@obsidianresearch.com>
Date:	Thu, 22 Mar 2012 14:58:24 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	Parav.Pandit@...lex.Com
Cc:	David.Laight@...LAB.COM, roland@...estorage.com,
	linux-rdma@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 2/9] ocrdma: Driver for Emulex OneConnect RDMA adapter

On Thu, Mar 22, 2012 at 01:52:30PM -0700, Parav.Pandit@...lex.Com wrote:

> > This can be used to force 32bit alignment in amd64 code in order to match
> > definitions in 32bit userspace.
> > For new things it would make sense to force 64bit alignment of 64bit fields
> > for 32bit code.
> 
> o.k. so I'll use aligned attribute to align user-kernel interface
> data structure to 8 byte boundary.  That should work for 32-bit and
> 64-bit user and kernel space and does't hurt performance either?

If the structure is only for user/kernel interfacing then it is much
better to add explicit padding fields to naturally place 64 bit
quantities on an 8 byte alignment than to mess with gcc specific
attributes (user space has a much wide choice of compilers).

This was David's second suggestion. Better to do this now before the
driver is accepted :)

Jason
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