[IA64] point saved_max_pfn to the max_pfn of the entire system

Make saved_max_pfn point to max_pfn of entire system.

Without this patch is so that vmcore is zero length on ia64.  This is
because saved_max_pfn was wrongly being set to the max_pfn of the crash
kernel's address space, rather than the max_pfg on the physical memory of
the machine - the whole purpose of vmcore is to access physical memory that
is not part of the crash kernel's addresss space.

Signed-off-by: Simon Horman <horms@verge.net.au>
Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Sort-Of-Acked-By: Jay Lan <jlan@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>

3 files changed, 6 insertions, 11 deletions

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 772ba6fe110f..32ce330cbc64 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -21,6 +21,7 @@
  *      Skip non-WB memory and ignore empty memory ranges.
  */
 #include <linux/module.h>
+#include <linux/bootmem.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/types.h>
@@ -1009,6 +1010,11 @@ efi_memmap_init(unsigned long *s, unsigned long *e)
                 } else
                         ae = efi_md_end(md);
 
+#ifdef CONFIG_CRASH_DUMP
+                /* saved_max_pfn should ignore max_addr= command line arg */
+                if (saved_max_pfn < (ae >> PAGE_SHIFT))
+                        saved_max_pfn = (ae >> PAGE_SHIFT);
+#endif
                 /* keep within max_addr= and min_addr= command line arg */
                 as = max(as, min_addr);
                 ae = min(ae, max_addr);
diff --git a/arch/ia64/mm/contig.c b/arch/ia64/mm/contig.c
index ca4d41e5f177..fb0f4698f5d0 100644
--- a/arch/ia64/mm/contig.c
+++ b/arch/ia64/mm/contig.c
@@ -197,11 +197,6 @@ find_memory (void)
 
         find_initrd();
 
-#ifdef CONFIG_CRASH_DUMP
-        /* If we are doing a crash dump, we still need to know the real mem
-         * size before original memory map is reset. */
-        saved_max_pfn = max_pfn;
-#endif
 }
 
 #ifdef CONFIG_SMP
diff --git a/arch/ia64/mm/discontig.c b/arch/ia64/mm/discontig.c
index 16835108bb5b..11a2d8825d89 100644
--- a/arch/ia64/mm/discontig.c
+++ b/arch/ia64/mm/discontig.c
@@ -480,12 +480,6 @@ void __init find_memory(void)
         max_pfn = max_low_pfn;
 
         find_initrd();
-
-#ifdef CONFIG_CRASH_DUMP
-        /* If we are doing a crash dump, we still need to know the real mem
-         * size before original memory map is reset. */
-        saved_max_pfn = max_pfn;
-#endif
 }
 
 #ifdef CONFIG_SMP