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Date: Wed, 13 Feb 2008 19:33:42 -0800 From: "Tony Luck" <tony.luck@...el.com> To: "David Miller" <davem@...emloft.net> Cc: mingo@...e.hu, rdreier@...co.com, linux-kernel@...r.kernel.org Subject: Re: Strange hang on ia64 with CONFIG_PRINTK_TIME=y > That's right. I thought you guys had something that would handle that > early on, but looking at how the trick works in the vmlinux.lds.S ia64 > uses that isn't the case. We try to get things set up pertty early ... but I agree this is fragile. Adding code to printk() to not provide a timestamp before some safe point in boot is a workaround to the current problem. But it may come back to haunt us if other per-cpu data is added that needs to be accessed early during boot. There are some changes going on at the moment on how we allocate the space for the per-cpu area. It is likely that for a non-boot cpu we might be able to get everything that we need for per-cpu access to work done in head.S before we can get to any C code. Boot cpu may be harder unless we statically allocate space for its per-cpu area in vmlinux.lds.S I'll take a closer look at what is needed tomorrow. -Tony -- 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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