From: Arnd Bergmann <arnd@arndb.de>
To: Vinod Koul <vinod.koul@intel.com>
Cc: Takashi Iwai <tiwai@suse.de>,
"Wang, Xiaoming" <xiaoming.wang@intel.com>,
jeeja.kp@intel.com, dhowells@redhat.com, tglx@linutronix.de,
mtk.manpages@gmail.com, paulmck@linux.vnet.ibm.com,
davej@redhat.com, linux-kernel@vger.kernel.org,
dongxing.zhang@intel.com
Subject: Re: [PATCH] ALSA: compress: Fix the mismatch size of struc between share lib(32bit) and kernel(64bit)
Date: Tue, 17 Jun 2014 13:48:59 +0200 [thread overview]
Message-ID: <201406171348.59329.arnd@arndb.de> (raw)
In-Reply-To: <20140617030636.GE22053@intel.com>
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.
Arnd
next prev parent reply other threads:[~2014-06-17 11:49 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-06-09 20:46 [PATCH] ALSA: compress: Fix the mismatch size of struc between share lib(32bit) and kernel(64bit) Wang, Xiaoming
2014-06-09 7:24 ` Takashi Iwai
2014-06-09 15:35 ` Vinod Koul
2014-06-12 6:39 ` Wang, Xiaoming
2014-06-13 14:19 ` Arnd Bergmann
2014-06-17 3:06 ` Vinod Koul
2014-06-17 11:48 ` Arnd Bergmann [this message]
2014-06-19 5:13 ` Vinod Koul
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