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Date: Wed, 9 Jul 2008 01:58:21 -0700 From: "Yinghai Lu" <yhlu.kernel@...il.com> To: "Ingo Molnar" <mingo@...e.hu> Cc: "Thomas Gleixner" <tglx@...utronix.de>, "H. Peter Anvin" <hpa@...or.com>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] x86: not overmap than end in init_memory_mapping - 64bit On Wed, Jul 9, 2008 at 1:46 AM, Ingo Molnar <mingo@...e.hu> wrote: > > * Yinghai Lu <yhlu.kernel@...il.com> wrote: > >> > reverting the commit solves the crash. The crash seems to be because >> > ACPI is unable to access that memory range. (perhaps early_ioremap >> > fails?) >> >> system with less than 4g? > > yeah. > >> please test attached patch >> [PATCH] x86: make max_pfn cover acpi table below 4g > > that fixed it, thanks. [ 0.000000] kernel direct mapping tables up to 3fff0000 @ 8000-b000 [ 0.000000] last_map_addr: 40000000 end: 3fff0000 [ 0.000000] ACPI: RSDP 000F76F0, 0014 (r0 Nvidia) last_map_addr is supposed to be 3fff0000. so it means before init_memory_mapping, initial page table already cover to 0x40000000 with 2M big page. and init_memory_mapping can not do anything with that is already mapped. it seems that need to make early_ioremap more smart... YH -- 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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