path: root/arch/arm/mm/init.c
diff options
authorSantosh Shilimkar <santosh.shilimkar@ti.com>2013-08-01 03:12:01 +0100
committerRussell King <rmk+kernel@arm.linux.org.uk>2013-10-31 14:49:29 +0000
commit26ba47b18318abe7dadbe9294a611c0e932651d8 (patch)
treeab542f22462c683920457069bf95893252f42538 /arch/arm/mm/init.c
parent8e0cb8a1f6acf673ef9ab573087020ebafa8da51 (diff)
ARM: 7805/1: mm: change max*pfn to include the physical offset of memory
Most of the kernel code assumes that max*pfn is maximum pfns because the physical start of memory is expected to be PFN0. Since this assumption is not true on ARM architectures, the meaning of max*pfn is number of memory pages. This is done to keep drivers happy which are making use of of these variable to calculate the dma bounce limit using dma_mask. Now since we have a architecture override possibility for DMAable maximum pfns, lets make meaning of max*pfns as maximum pnfs on ARM as well. Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: Will Deacon <will.deacon@arm.com> Cc: Nicolas Pitre <nicolas.pitre@linaro.org> Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/mm/init.c')
1 files changed, 4 insertions, 6 deletions
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 8aab24f35a5..d50533c2b40 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -426,12 +426,10 @@ void __init bootmem_init(void)
* This doesn't seem to be used by the Linux memory manager any
* more, but is used by ll_rw_block. If we can get rid of it, we
* also get rid of some of the stuff above as well.
- *
- * Note: max_low_pfn and max_pfn reflect the number of _pages_ in
- * the system, not the maximum PFN.
- max_low_pfn = max_low - PHYS_PFN_OFFSET;
- max_pfn = max_high - PHYS_PFN_OFFSET;
+ min_low_pfn = min;
+ max_low_pfn = max_low;
+ max_pfn = max_high;
@@ -537,7 +535,7 @@ static inline void free_area_high(unsigned long pfn, unsigned long end)
static void __init free_highpages(void)
- unsigned long max_low = max_low_pfn + PHYS_PFN_OFFSET;
+ unsigned long max_low = max_low_pfn;
struct memblock_region *mem, *res;
/* set highmem page free */