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[PATCH] kdump: Retrieve saved max pfn

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This patch retrieves the max_pfn being used by previous kernel and stores it
in a safe location (saved_max_pfn) before it is overwritten due to user
defined memory map.  This pfn is used to make sure that user does not try to
read the physical memory beyond saved_max_pfn.

Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Vivek Goyal 2005-06-25 14:58:18 -07:00 • committed by Linus Torvalds
parent d58831e416
commit 92aa63a5a1
3 changed files with 24 additions and 0 deletions
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4
include/linux/bootmem.h
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@ -22,6 +22,10 @@ extern unsigned long min_low_pfn;
*/
extern unsigned long max_pfn;
#ifdef CONFIG_CRASH_DUMP
extern unsigned long saved_max_pfn;
#endif
/*
* node_bootmem_map is a map pointer - the bits represent all physical
* memory pages (including holes) on the node.