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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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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