linux-kernel - Re: [patch 34/54] Staging: hv: remove STRUCT_PACKED and STRUCT

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Message-ID: <20090724213218.GA13702@logfs.org>
Date:	Fri, 24 Jul 2009 23:32:19 +0200
From:	Jörn Engel <joern@...fs.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	virtualization@...ts.linux-foundation.org,
	Greg Kroah-Hartman <gregkh@...e.de>,
	linux-kernel@...r.kernel.org, devel@...verdev.osuosl.org,
	virtualization@...ts.osdl.org, Sam Ramji <sramji@...rosoft.com>,
	Haiyang Zhang <haiyangz@...rosoft.com>,
	Hank Janssen <hjanssen@...rosoft.com>,
	shemminger@...ux-foundation.org
Subject: Re: [patch 34/54] Staging: hv: remove STRUCT_PACKED and STRUCT_ALIGNED defines

On Tue, 21 July 2009 01:46:41 +0200, Arnd Bergmann wrote:
> On Friday 17 July 2009, Greg Kroah-Hartman wrote:
> > @@ -43,7 +43,7 @@ typedef struct _RING_BUFFER {
> >         // volatile u32 InterruptMask;
> >         // Ring data starts here + RingDataStartOffset !!! DO NOT place any fields below this !!!
> >      u8         Buffer[0];
> > -} STRUCT_PACKED RING_BUFFER;
> > +} __attribute__((packed)) RING_BUFFER;
> >  
> 
> The data structure is actually packed already, the attribute does not make it better
> and could be removed. We also have __packed as a shortcut for __attribute__((packed)).

Honestly, I don't know how useful __packed really is.  In a shared
kernel/userspace header, it is only defined for the kernel.

Jörn

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