Messages in this thread Patch in this message | | | Date | Thu, 8 Dec 2005 09:45:09 +0530 | From | Vivek Goyal <> | Subject | [PATCH] x86_64: acpi map table fix |
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o Memory till end_pfn_map has been directly mapped. So all the memory references to the last page (represented by end_pfn_map) should be valid.
o I run into problem with kdump when I use memmap=exactmap option and also pass memmap=X#Y to directly map acpi tables. ACPI initialization in second kernel fails because some of the valid ACPI memory is not accessible.
o /proc/iomem shows ACPI tables at c7fcb940-c7fcf7ff : ACPI Tables. Here end_pfn_map is set to c7fcf000. But c7fcf700 should also be a valid access.
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> ---
diff -puN arch/i386/kernel/acpi/boot.c~acpi-map-address-fix arch/i386/kernel/acpi/boot.c --- linux-2.6.15-rc5-mm1-16M/arch/i386/kernel/acpi/boot.c~acpi-map-address-fix 2005-12-07 15:56:33.000000000 +0530 +++ linux-2.6.15-rc5-mm1-16M-root/arch/i386/kernel/acpi/boot.c 2005-12-07 15:58:04.000000000 +0530 @@ -108,7 +108,7 @@ char *__acpi_map_table(unsigned long phy if (!phys_addr || !size) return NULL; - if (phys_addr < (end_pfn_map << PAGE_SHIFT)) + if (phys_addr < ((end_pfn_map << PAGE_SHIFT) + PAGE_SIZE)) return __va(phys_addr); return NULL; _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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