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Hack for incompatible __GFP_COMP flag making its way into the AVR32
DMA consistent memory allocator.
This is essentially the same patch as the one submitted by
Marc Singer <elf@buici.com> for ARM.
---
arch/avr32/mm/dma-coherent.c | 7 +++++++
1 file changed, 7 insertions(+)
Index: linux-2.6.18-avr32/arch/avr32/mm/dma-coherent.c
===================================================================
--- linux-2.6.18-avr32.orig/arch/avr32/mm/dma-coherent.c 2006-09-11 18:06:00.000000000 +0200
+++ linux-2.6.18-avr32/arch/avr32/mm/dma-coherent.c 2006-09-12 13:38:39.000000000 +0200
@@ -41,6 +41,13 @@ static struct page *__dma_alloc(struct d
struct page *page, *free, *end;
int order;
+ /* Following is a work-around (a.k.a. hack) to prevent pages
+ * with __GFP_COMP being passed to split_page() which cannot
+ * handle them. The real problem is that this flag probably
+ * should be 0 on AVR32 as it is not supported on this
+ * platform--see CONFIG_HUGETLB_PAGE. */
+ gfp &= ~(__GFP_COMP);
+
size = PAGE_ALIGN(size);
order = get_order(size);
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