linux-kernel - Re: [PATCH 1/3] module: deal with alignment issues in built-in module versions

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Message-Id: <20110217.131702.112601300.davem@davemloft.net>
Date:	Thu, 17 Feb 2011 13:17:02 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	torvalds@...ux-foundation.org
Cc:	dtor@...are.com, linux-kernel@...r.kernel.org,
	geert@...ux-m68k.org, rusty@...tcorp.com.au,
	linux-m68k@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 1/3] module: deal with alignment issues in built-in
 module versions

From: Linus Torvalds <torvalds@...ux-foundation.org>
Date: Thu, 17 Feb 2011 13:11:56 -0800

> EVERY SINGLE OF YOUR ARGUMENTS WORK FOR "pointer" TOO!

It at least will not happen at the current time, because GCC only
plays these games on aggregates.

Also, for exception tables, we've avoided this problem because
we emit the exception tables by hand using inline asm and therefore
explicitly control all aspects of the alignment and size.

The GCC manual even documents the alignment attribute behavior.

Also, please don't shoot the messenger, I didn't make GCC behave this
way but I doubt you'll have any luck undoing this behavior in the
tools which therefore means as pragmatists we have to handle it one
way or another.
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