[PATCH] x86-64: setup saved_max_pfn correctly (kdump)

x86_64: setup saved_max_pfn correctly

2.6.19-rc4 has broken CONFIG_CRASH_DUMP support on x86_64. It is impossible
to read out the kernel contents from /proc/vmcore because saved_max_pfn is set
to zero instead of the max_pfn value before the user map is setup.

This happens because saved_max_pfn is initialized at parse_early_param() time,
and at this time no active regions have been registered. save_max_pfn is setup
from e820_end_of_ram(), more exact find_max_pfn_with_active_regions() which
returns 0 because no regions exist.

This patch fixes this by registering before and removing after the call
to e820_end_of_ram().

Signed-off-by: Magnus Damm <magnus@valinux.co.jp>
Signed-off-by: Andi Kleen <ak@suse.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/x86_64/kernel/e820.c b/arch/x86_64/kernel/e820.c
index 855b5611318f..6fe191c58084 100644
--- a/arch/x86_64/kernel/e820.c
+++ b/arch/x86_64/kernel/e820.c
@@ -594,7 +594,9 @@ static int __init parse_memmap_opt(char *p)
                  * size before original memory map is
                  * reset.
                  */
+                e820_register_active_regions(0, 0, -1UL);
                 saved_max_pfn = e820_end_of_ram();
+                remove_all_active_ranges();
 #endif
                 end_pfn_map = 0;
                 e820.nr_map = 0;