linux-kernel - Re: powerpc problem with .data.page_aligned -> __page_aligned

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Message-Id: <1255636809.2347.103.camel@pasglop>
Date:	Fri, 16 Oct 2009 07:00:09 +1100
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Tim Abbott <tabbott@...lice.com>
Cc:	sam@...nborg.org, linuxppc-dev@...ts.ozlabs.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: powerpc problem with .data.page_aligned -> __page_aligned_data
 conversion

On Thu, 2009-10-15 at 12:37 -0400, Tim Abbott wrote:
> Just to make sure I understand the nature of the problem, is the
> current 
> breakage that gcc < 4.3 will _warn_ on any compilation units on ppc64
> that 
> use __page_aligned data, or something worse?
> 
> The cropping is clearly a potential problem, but I read the rest of
> your 
> email as saying that the cropping of the alignment isn't actually a 
> problem with the current kernel because the kernel is currently only
> using 
> the macro with things whose size is divisible by PAGE_SIZE.  However,
> I am 
> not sure how to reconcile that with using the word "break" above...

Break is because we use -Werror on arch/powerpc :-)

Ben.


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