Zou Nan hai a3f5c338b9 [IA64] min_low_pfn and max_low_pfn calculation fix ... We have seen bad_pte_print when testing crashdump on an SN machine in recent 2.6.20 kernel. There are tons of bad pte print (pfn < max_low_pfn) reports when the crash kernel boots up, all those reported bad pages are inside initmem range; That is because if the crash kernel code and data happens to be at the beginning of the 1st node. build_node_maps in discontig.c will bypass reserved regions with filter_rsvd_memory. Since min_low_pfn is calculated in build_node_map, so in this case, min_low_pfn will be greater than kernel code and data. Because pages inside initmem are freed and reused later, we saw pfn_valid check fail on those pages. I think this theoretically happen on a normal kernel. When I check min_low_pfn and max_low_pfn calculation in contig.c and discontig.c. I found more issues than this. 1. min_low_pfn and max_low_pfn calculation is inconsistent between contig.c and discontig.c, min_low_pfn is calculated as the first page number of boot memmap in contig.c (Why? Though this may work at the most of the time, I don't think it is the right logic). It is calculated as the lowest physical memory page number bypass reserved regions in discontig.c. max_low_pfn is calculated include reserved regions in contig.c. It is calculated exclude reserved regions in discontig.c. 2. If kernel code and data region is happen to be at the begin or the end of physical memory, when min_low_pfn and max_low_pfn calculation is bypassed kernel code and data, pages in initmem will report bad. 3. initrd is also in reserved regions, if it is at the begin or at the end of physical memory, kernel will refuse to reuse the memory. Because the virt_addr_valid check in free_initrd_mem. So it is better to fix and clean up those issues. Calculate min_low_pfn and max_low_pfn in a consistent way. Signed-off-by: Zou Nan hai <nanhai.zou@intel.com> Acked-by: Jay Lan <jlan@sgi.com> Signed-off-by: Tony Luck <tony.luck@intel.com>		2007-03-20 13:41:57 -07:00
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configs	[IA64] refresh config files	2007-03-08 11:20:17 -08:00
dig
hp	[PATCH] mark struct file_operations const 2	2007-02-12 09:48:44 -08:00
ia32	[IA64] sync compat getdents	2007-03-06 14:49:24 -08:00
kernel	[IA64] put kdump_find_rsvd_region in __init	2007-03-08 10:29:58 -08:00
lib	[IA64] always build arch/ia64/lib/xor.o	2007-03-06 14:48:52 -08:00
mm	[IA64] min_low_pfn and max_low_pfn calculation fix	2007-03-20 13:41:57 -07:00
oprofile
pci	[IA64] replace kmalloc+memset with kzalloc	2006-12-07 13:46:43 -08:00
scripts
sn	Pull altix into release branch	2007-03-09 23:17:39 -05:00
defconfig	[IA64] refresh config files	2007-03-08 11:20:17 -08:00
install.sh
Kconfig	ATA convert GSI to irq on ia64	2007-02-15 18:04:53 -05:00
Kconfig.debug
Makefile
module.lds