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Commit b77dae52 authored by Dean Roe's avatar Dean Roe Committed by Tony Luck
Browse files

[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: default avatarDean Roe <roe@sgi.com>
Signed-off-by: default avatarTony Luck <tony.luck@intel.com>
parent 624f54be

arch/ia64/kernel/ia64_ksyms.c

+1 −0
Original line number Diff line number Diff line
@@ -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

include/asm-ia64/page.h

+2 −1
Original line number Diff line number Diff line
@@ -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