From: Yinghai Lu Date: Sat, 12 Jul 2008 21:30:35 +0000 (-0700) Subject: x86: max_low_pfn_mapped fix, #1 X-Git-Tag: v2.6.27-rc1~1106^2~10 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7ab073b6e0cde1544f4e79fadb75532528af7595;p=pandora-kernel.git x86: max_low_pfn_mapped fix, #1 fix crash on Ingo's big box: calling pci_iommu_init+0x0/0x17 PCI-DMA: Disabling AGP. PCI-DMA: aperture base @ d0000000 size 65536 KB PCI-DMA: using GART IOMMU. PCI-DMA: Reserving 64MB of IOMMU area in the AGP aperture BUG: unable to handle kernel paging request at ffff88000003be88 IP: [] __alloc_pages_internal+0xc3/0x3f2 PGD 202063 PUD 206063 PMD 22fc00163 PTE 3b162 Oops: 0000 [1] SMP and e820 is: BIOS-e820: 0000000000000000 - 000000000009ac00 (usable) BIOS-e820: 000000000009ac00 - 00000000000a0000 (reserved) BIOS-e820: 00000000000ca000 - 0000000000100000 (reserved) BIOS-e820: 0000000000100000 - 000000007ff70000 (usable) BIOS-e820: 000000007ff70000 - 000000007ff86000 (ACPI data) BIOS-e820: 000000007ff86000 - 0000000080000000 (ACPI NVS) BIOS-e820: 0000000080000000 - 00000000cfe00000 (usable) BIOS-e820: 00000000cfe00000 - 00000000d0000000 (reserved) BIOS-e820: 00000000e0000000 - 00000000f0000000 (reserved) BIOS-e820: 00000000fec00000 - 00000000fec10000 (reserved) BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) BIOS-e820: 00000000fff80000 - 0000000100000000 (reserved) BIOS-e820: 0000000100000000 - 0000000830000000 (usable) system has 32 GB RAM installed. max_low_pfn_mapped is 0xcfe00, and GART aperture is not mapped. So try to use init_memory_mapping to map that area, because the iommu thinks that area is ram ... Signed-off-by: Yinghai Lu Cc: Suresh Siddha Signed-off-by: Ingo Molnar --- Reading git-diff-tree failed