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Message-ID: <m1prpxh2fl.fsf@frodo.ebiederm.org> Date: Tue, 01 Jul 2008 11:41:50 -0700 From: ebiederm@...ssion.com (Eric W. Biederman) To: "H. Peter Anvin" <hpa@...or.com> Cc: Jeremy Fitzhardinge <jeremy@...p.org>, Mike Travis <travis@....com>, Christoph Lameter <clameter@....com>, Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area "H. Peter Anvin" <hpa@...or.com> writes: > Eric W. Biederman wrote: >>> >>> The zero-based PDA mechanism requires the introduction of a new ELF segment >>> based at vaddr 0 which is sufficiently unusual that it wouldn't surprise me > if >>> its triggering some toolchain bug. >> >> Agreed. Given the previous description my hunch is that the bug is occurring >> during objcopy. If vmlinux is good and the compressed kernel is bad. >> > > Actually, it's not all that unusual... it's pretty common in various restricted > environments. That being said, it's probably uncommon for *64-bit* code. It is a sensible thing to expect to work. By unusual I mean it isn't triggered by normal userspace code. In general I find that ld features if they aren't used in userspace and they aren't used in the kernel don't work reliably across versions. Eric -- 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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