Messages in this thread | | | From | (Eric W. Biederman) | Date | Tue, 01 Jul 2008 11:41:50 -0700 | Subject | Re: [crash, bisected] Re: [PATCH 3/4] x86_64: Fold pda into per cpu area |
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"H. Peter Anvin" <hpa@zytor.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
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