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-rw-r--r--arch/arc/Kconfig3
-rw-r--r--arch/arc/include/asm/page.h20
-rw-r--r--arch/arc/mm/init.c29
3 files changed, 41 insertions, 11 deletions
diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 0a89cc9def65..c874f8ab0341 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -67,6 +67,7 @@ config GENERIC_CSUM
config ARCH_DISCONTIGMEM_ENABLE
def_bool n
+ depends on BROKEN
config ARCH_FLATMEM_ENABLE
def_bool y
@@ -506,7 +507,7 @@ config LINUX_RAM_BASE
config HIGHMEM
bool "High Memory Support"
- select ARCH_DISCONTIGMEM_ENABLE
+ select HAVE_ARCH_PFN_VALID
help
With ARC 2G:2G address split, only upper 2G is directly addressable by
kernel. Enable this to potentially allow access to rest of 2G and PAE
diff --git a/arch/arc/include/asm/page.h b/arch/arc/include/asm/page.h
index b0dfed0f12be..23e41e890eda 100644
--- a/arch/arc/include/asm/page.h
+++ b/arch/arc/include/asm/page.h
@@ -82,11 +82,25 @@ typedef pte_t * pgtable_t;
*/
#define virt_to_pfn(kaddr) (__pa(kaddr) >> PAGE_SHIFT)
-#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
+/*
+ * When HIGHMEM is enabled we have holes in the memory map so we need
+ * pfn_valid() that takes into account the actual extents of the physical
+ * memory
+ */
+#ifdef CONFIG_HIGHMEM
+
+extern unsigned long arch_pfn_offset;
+#define ARCH_PFN_OFFSET arch_pfn_offset
+
+extern int pfn_valid(unsigned long pfn);
+#define pfn_valid pfn_valid
-#ifdef CONFIG_FLATMEM
+#else /* CONFIG_HIGHMEM */
+
+#define ARCH_PFN_OFFSET virt_to_pfn(CONFIG_LINUX_RAM_BASE)
#define pfn_valid(pfn) (((pfn) - ARCH_PFN_OFFSET) < max_mapnr)
-#endif
+
+#endif /* CONFIG_HIGHMEM */
/*
* __pa, __va, virt_to_page (ALERT: deprecated, don't use them)
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