[IA64] - Make pfn_valid more precise for SGI Altix systems

A single SGI Altix system can be divided into multiple partitions,
each running their own instance of the Linux kernel.  pfn_valid()
is currently not optimal for any but the first partition, since it
does not compare the pfn with min_low_pfn before calling the more
costly ia64_pfn_valid().

Signed-off-by: Dean Roe <roe@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 2 insertions, 1 deletions

diff --git a/include/asm-ia64/page.h b/include/asm-ia64/page.h
index 9dd9da105278..5e6362a786b7 100644
--- a/include/asm-ia64/page.h
+++ b/include/asm-ia64/page.h
@@ -110,8 +110,9 @@ extern int ia64_pfn_valid (unsigned long pfn);
 # define pfn_to_page(pfn)       (mem_map + (pfn))
 #elif defined(CONFIG_DISCONTIGMEM)
 extern struct page *vmem_map;
+extern unsigned long min_low_pfn;
 extern unsigned long max_low_pfn;
-# define pfn_valid(pfn)         (((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
+# define pfn_valid(pfn)         (((pfn) >= min_low_pfn) && ((pfn) < max_low_pfn) && ia64_pfn_valid(pfn))
 # define page_to_pfn(page)      ((unsigned long) (page - vmem_map))
 # define pfn_to_page(pfn)       (vmem_map + (pfn))
 #endif