linux-kernel - Re: [PATCH] ALSA: compress: Fix the mismatch size of struc between share lib(32bit) and kernel(64bit)

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Date:	Thu, 19 Jun 2014 10:43:00 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Takashi Iwai <tiwai@...e.de>,
	"Wang, Xiaoming" <xiaoming.wang@...el.com>, jeeja.kp@...el.com,
	dhowells@...hat.com, tglx@...utronix.de, mtk.manpages@...il.com,
	paulmck@...ux.vnet.ibm.com, davej@...hat.com,
	linux-kernel@...r.kernel.org, dongxing.zhang@...el.com
Subject: Re: [PATCH] ALSA: compress: Fix the mismatch size of struc between
 share lib(32bit) and kernel(64bit)

On Tue, Jun 17, 2014 at 01:48:59PM +0200, Arnd Bergmann wrote:
> On Tuesday 17 June 2014, Vinod Koul wrote:
> > > Anyway, if you use the __packed attribute, best apply it only to
> > > the individual __u64 member(s), not the entire struct, otherwise
> > > you might change user space programs in a subtle way when the alignment
> > > changes from 4 to 1 byte. 
> >
> > then wouldn't it make sense to call out the aligned as well to ensure that it is
> > aligning to what we want. Then we should add aligned (4) everywhere as mostly we
> > need 4 byte aligned here
> 
> If you want to be explicit, then just mark the entire structure as
> attribute((packed,aligned(4))), not each individual member.
Oh yes, thats the idea. I will send out and also while reviewing found that
packed was missing for few of other structs, so lets fix it now before 64bits
systems proliferate and cause havoc :)

-- 
~Vinod
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