1.1 --- a/linux-2.6.9-xen-sparse/arch/xen/i386/mm/ioremap.c	Sun Nov 28 21:35:44 2004 +0000
     1.2 +++ b/linux-2.6.9-xen-sparse/arch/xen/i386/mm/ioremap.c	Mon Nov 29 09:19:19 2004 +0000
     1.3 @@ -37,20 +37,17 @@ void __init bt_iounmap(void *addr, unsig
     1.4  #else
     1.5  
     1.6  /*
     1.7 - * Is @address within a RAM page that is local to this virtual machine (i.e.,
     1.8 - * not an I/O page; not a RAM page belonging to another VM). See the comment
     1.9 - * that accompanies pte_pfn() in pgtable-2level.h to understand why this works.
    1.10 + * Does @address reside within a non-highmem page that is local to this virtual
    1.11 + * machine (i.e., not an I/O page, nor a memory page belonging to another VM).
    1.12 + * See the comment that accompanies pte_pfn() in pgtable-2level.h to understand
    1.13 + * why this works.
    1.14   */
    1.15 -static inline int is_local_ram(unsigned long address)
    1.16 +static inline int is_local_lowmem(unsigned long address)
    1.17  {
    1.18 +	extern unsigned long max_low_pfn;
    1.19  	unsigned long mfn = address >> PAGE_SHIFT;
    1.20  	unsigned long pfn = mfn_to_pfn(mfn);
    1.21 -	if (pfn < max_mapnr) {
    1.22 -		if (pfn_to_mfn(pfn) == mfn)
    1.23 -			return 1; /* local ram */
    1.24 -		printk("is_local_ram: ioremapping foreign ram (a bad idea).\n");
    1.25 -	}
    1.26 -	return 0; /* i/o memory or foreign ram */
    1.27 +	return ((pfn < max_low_pfn) && (pfn_to_mfn(pfn) == mfn));
    1.28  }
    1.29  
    1.30  static inline void remap_area_pte(pte_t * pte, unsigned long address, unsigned long size,
    1.31 @@ -166,7 +163,7 @@ void __iomem * __ioremap(unsigned long p
    1.32  	/*
    1.33  	 * Don't allow anybody to remap normal RAM that we're using..
    1.34  	 */
    1.35 -	if (is_local_ram(phys_addr)) {
    1.36 +	if (is_local_lowmem(phys_addr)) {
    1.37  		char *t_addr, *t_end;
    1.38  		struct page *page;
    1.39  
    1.40 @@ -233,7 +230,7 @@ void __iomem *ioremap_nocache (unsigned 
    1.41  	/* Guaranteed to be > phys_addr, as per __ioremap() */
    1.42  	last_addr = phys_addr + size - 1;
    1.43  
    1.44 -	if (is_local_ram(last_addr)) { 
    1.45 +	if (is_local_lowmem(last_addr)) { 
    1.46  		struct page *ppage = virt_to_page(bus_to_virt(phys_addr));
    1.47  		unsigned long npages;
    1.48  
    1.49 @@ -270,7 +267,7 @@ void iounmap(volatile void __iomem *addr
    1.50  		return;
    1.51  	} 
    1.52  
    1.53 -	if (p->flags && is_local_ram(p->phys_addr)) { 
    1.54 +	if (p->flags && is_local_lowmem(p->phys_addr)) { 
    1.55  		change_page_attr(virt_to_page(bus_to_virt(p->phys_addr)),
    1.56  				 p->size >> PAGE_SHIFT,
    1.57  				 PAGE_KERNEL);