linux-kernel - Re: [PATCH] ubi: kill homegrown endian macros

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Date:	Fri, 18 May 2007 22:52:39 +0800
From:	David Woodhouse <dwmw2@...radead.org>
To:	"John Anthony Kazos Jr." <jakj@...-k-j.com>
Cc:	Matthieu CASTET <castet.matthieu@...e.fr>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] ubi: kill homegrown endian macros

On Fri, 2007-05-18 at 07:52 -0400, John Anthony Kazos Jr. wrote:
> Out of curiosity, why would a compiler ever insert padding in a structure 
> that has all its elements properly-aligned? 

Well, it might decide it would be nicer if some elements were aligned to
64 bits. Or to a cache line. Or something. I don't care about _why_ --
the point is that it's _allowed_ to. Hence the original use of
__attribute__((packed)).

In practice, there's no real reason why it would do such a thing, which
is why I removed the packed attribute and replaced it with a runtime
check on the size of the structures in question.

-- 
dwmw2

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