linux-kernel - Re: [bisected] Re: [PATCH 05 of 12] xen: add p2m mfn_list

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Message-ID: <20080602101059.GB7459@elte.hu>
Date:	Mon, 2 Jun 2008 12:10:59 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Jeremy Fitzhardinge <jeremy@...p.org>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	xen-devel <xen-devel@...ts.xensource.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>, x86@...nel.org,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [bisected] Re: [PATCH 05 of 12] xen: add p2m mfn_list_list


* Jeremy Fitzhardinge <jeremy@...p.org> wrote:

> Subject: make page-aligned data and bss less fragile
>
> Making a variable page-aligned by using 
> __attribute__((section(".data.page_aligned"))) is fragile because if 
> sizeof(variable) is not also a multiple of page size, it leaves 
> variables in the remainder of the section unaligned.
>
> This patch introduces two new qualifiers, __page_aligned_data and 
> __page_aligned_bss to set the section *and* the alignment of 
> variables.  This makes page-aligned variables more robust because the 
> linker will make sure they're aligned properly.  Unfortunately it 
> requires *all* page-aligned data to use these macros...

applied to -tip, thanks Jeremy. Created a new topic branch for the core 
bits of it: tip/build. Sam might want to pull from that topic branch 
eventually, once these changes pass testing in -tip.

	Ingo
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