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

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Message-ID: <4843F1B9.7070108@goop.org>
Date:	Mon, 02 Jun 2008 14:12:25 +0100
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Ingo Molnar <mingo@...e.hu>
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

Ingo Molnar wrote:
> * 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.
>   

Can you also drop "xen: fix early bootup crash on native hardware" and 
replace it with "x86: use __page_aligned_data/bss"?  (Which seems to 
have been partially applied?)

Thanks,
    J
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