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-rw-r--r--arch/arc/mm/init.c29
1 files changed, 22 insertions, 7 deletions
diff --git a/arch/arc/mm/init.c b/arch/arc/mm/init.c
index 3a35b82a718e..ce07e697916c 100644
--- a/arch/arc/mm/init.c
+++ b/arch/arc/mm/init.c
@@ -28,6 +28,8 @@ static unsigned long low_mem_sz;
static unsigned long min_high_pfn, max_high_pfn;
static phys_addr_t high_mem_start;
static phys_addr_t high_mem_sz;
+unsigned long arch_pfn_offset;
+EXPORT_SYMBOL(arch_pfn_offset);
#endif
#ifdef CONFIG_DISCONTIGMEM
@@ -98,16 +100,11 @@ void __init setup_arch_memory(void)
init_mm.brk = (unsigned long)_end;
/* first page of system - kernel .vector starts here */
- min_low_pfn = ARCH_PFN_OFFSET;
+ min_low_pfn = virt_to_pfn(CONFIG_LINUX_RAM_BASE);
/* Last usable page of low mem */
max_low_pfn = max_pfn = PFN_DOWN(low_mem_start + low_mem_sz);
-#ifdef CONFIG_FLATMEM
- /* pfn_valid() uses this */
- max_mapnr = max_low_pfn - min_low_pfn;
-#endif
-
/*------------- bootmem allocator setup -----------------------*/
/*
@@ -153,7 +150,9 @@ void __init setup_arch_memory(void)
* DISCONTIGMEM in turns requires multiple nodes. node 0 above is
* populated with normal memory zone while node 1 only has highmem
*/
+#ifdef CONFIG_DISCONTIGMEM
node_set_online(1);
+#endif
min_high_pfn = PFN_DOWN(high_mem_start);
max_high_pfn = PFN_DOWN(high_mem_start + high_mem_sz);
@@ -161,8 +160,15 @@ void __init setup_arch_memory(void)
max_zone_pfn[ZONE_HIGHMEM] = min_low_pfn;
high_memory = (void *)(min_high_pfn << PAGE_SHIFT);
+
+ arch_pfn_offset = min(min_low_pfn, min_high_pfn);
kmap_init();
-#endif
+
+#else /* CONFIG_HIGHMEM */
+ /* pfn_valid() uses this when FLATMEM=y and HIGHMEM=n */
+ max_mapnr = max_low_pfn - min_low_pfn;
+
+#endif /* CONFIG_HIGHMEM */
free_area_init(max_zone_pfn);
}
@@ -190,3 +196,12 @@ void __init mem_init(void)
highmem_init();
mem_init_print_info(NULL);
}
+
+#ifdef CONFIG_HIGHMEM
+int pfn_valid(unsigned long pfn)
+{
+ return (pfn >= min_high_pfn && pfn <= max_high_pfn) ||
+ (pfn >= min_low_pfn && pfn <= max_low_pfn);
+}
+EXPORT_SYMBOL(pfn_valid);
+#endif