diff options
| author | Dean Roe <roe@sgi.com> | 2005-11-09 14:25:06 -0600 |
|---|---|---|
| committer | Tony Luck <tony.luck@intel.com> | 2005-11-29 09:24:10 -0800 |
| commit | b77dae5293efba42ea1ff04d410ee68e66d5b0cf (patch) | |
| tree | e7cff6570c32d55e4743f0e59c53ab9086c1efd6 | |
| parent | 624f54be206adf970cd8eece16446b027913e533 (diff) | |
[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>
| -rw-r--r-- | arch/ia64/kernel/ia64_ksyms.c | 1 | ||||
| -rw-r--r-- | include/asm-ia64/page.h | 3 |
2 files changed, 3 insertions, 1 deletions
diff --git a/arch/ia64/kernel/ia64_ksyms.c b/arch/ia64/kernel/ia64_ksyms.c index 01572814abe..5db9d3bcbbc 100644 --- a/arch/ia64/kernel/ia64_ksyms.c +++ b/arch/ia64/kernel/ia64_ksyms.c @@ -42,6 +42,7 @@ EXPORT_SYMBOL(clear_page); #ifdef CONFIG_VIRTUAL_MEM_MAP #include <linux/bootmem.h> +EXPORT_SYMBOL(min_low_pfn); /* defined by bootmem.c, but not exported by generic code */ EXPORT_SYMBOL(max_low_pfn); /* defined by bootmem.c, but not exported by generic code */ #endif diff --git a/include/asm-ia64/page.h b/include/asm-ia64/page.h index 9dd9da10527..5e6362a786b 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 |